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We encourage you to perform a real-time search of NLEBeta
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1

Exotic in Leptonic Machines  

E-Print Network [OSTI]

Selected topics of exotics in leptonic machines are presented, including recent discovery of abnormal structures around the ppbar threshold and new information of the XYZ (charmonium-like) states.

Kai Zhu

2014-08-07T23:59:59.000Z

2

Testing the lepton number of charged heavy leptons  

Science Journals Connector (OSTI)

The lepton-number assignment of the charged heavy leptons (suggested by the SLAC-LBL ?e? events) has definite signatures which can be tested experimentally. We study the signatures and calculate the decay rates when the neutral currents are also contributing.

Ahmed Ali and T. C. Yang

1976-12-01T23:59:59.000Z

3

Lepton textures and neutrino oscillations  

E-Print Network [OSTI]

Systematic analyses of the textures arising in lepton mass matrices have been carried out using unitary transformations and condition of naturalness for the Dirac and Majorana neutrino possibilities. It is observed that the recent three neutrino oscillation data together with the effective mass in neutrinoless double beta decay provide vital clues in predicting the general structures of these lepton mass matrices.

Verma, Rohit

2014-01-01T23:59:59.000Z

4

Proceedings of the Lepton Photon 2009  

E-Print Network [OSTI]

in particle physics, and in accelerator development for particle physics and synchroton sources. For Lepton

5

Interference Effects in Leptonic Decays  

Science Journals Connector (OSTI)

It is proven that in any leptonic decay experiment in which the lepton masses and charges may be neglected, and in which no pseudoscalar correlations are measured, all VA interference terms will be antisymmetric under exchange of the two leptons, while the pure V and A terms will be symmetric. If the experiment measures a pseudoscalar correlation, these conclusions are reversed. Even if the lepton masses cannot be ignored (e.g., for ?0??-+?+p, or low-energy ? decay) it is still true that no VA interference may appear when scalars are measured, and only VA interference may contribute when pseudoscalars are measured, providing that the lepton spins and momenta are not directly observed. Thus experiments can be devised that involve no interference effects, or only interference effects. This theorem holds independently of the strangeness change, spin change, energy transfer, or of any particular assumptions about the form of the V and A currents. It proves most useful when it is difficult or tedious to calculate transition rates directly. Applications are discussed, including possible tests of the Feynman-Gell-Mann theory in nonunique forbidden ? decay, of the nature of the leptonic ?0 and K0 decay interaction, and of the charge symmetry properties of weak interactions.

Steven Weinberg

1959-07-15T23:59:59.000Z

6

Expectations for Baryon and Lepton Nonconservation  

Science Journals Connector (OSTI)

Are baryon and lepton conservation actually violated in nature? At this moment, we do not know. Nevertheless, it seems a good idea to try to anticipate the details of baryon or lepton nonconserving processes, ...

Steven Weinberg

1980-01-01T23:59:59.000Z

7

Status of Heavy-lepton Searches  

DOE R&D Accomplishments [OSTI]

Searches for heavy leptons using e{sup +}e{sup -} annihilation, lepton-hadron collisions, photon-hadron collisions, hadron-hadron collisions, and studies of macroscopic matter are reviewed. The present experimental status and future possibilities are summarized.

Perl, M. L.

1981-06-00T23:59:59.000Z

8

Search for neutrinoless decays of the ? lepton  

E-Print Network [OSTI]

We have searched for neutrinoless ? decays into three charged particles. Evidence of such decays would demonstrate nonconservation of lepton flavor and, in some cases, lepton number. We see no signal for any such neutrinoless ? decays and set upper...

Baringer, Philip S.

1990-02-01T23:59:59.000Z

9

Flavordynamics of quarks and leptons  

Science Journals Connector (OSTI)

The present theory of flavordynamics is discussed. After giving a general introduction into the field we describe the gauge theory framework and the spontaneous symmetry breaking. Several examples of spontaneously broken theories are studied. We describe the standard theory of leptons and quarks. A special emphasis is given to a discussion of the weak decays of strange and charmed particles. Furthermore the neutral current interaction is studied. We discuss the sequential flavordynamics of leptons and quarks, concentrating on the six flavor scheme, and speculations about extended schemes of flavordynamics. The report concludes with a description of weak interactions at very high energies (production and decays of W, Z or Higgs bosons etc.).

H. Fritzsch; P. Minkowski

1981-01-01T23:59:59.000Z

10

The physics of the ? lepton  

Science Journals Connector (OSTI)

A comprehensive review of the status of ?-lepton physics is presented. We include the knowledge on the properties of the tau, the decay branching fractions and tests of the standard model. Discussions of possible puzzles and an indication of the future possibilities in this field are a lso presented.

B.C. Barish; R. Stroynowski

1988-01-01T23:59:59.000Z

11

Polarized lepton-nucleon scattering  

SciTech Connect (OSTI)

Deep inelastic polarized lepton-nucleon scattering is reviewed in three lectures. The first lecture covers the polarized deep inelastic scattering formalism and foundational theoretical work. The second lecture describes the nucleon spin structure function experiments that have been performed up through 1993. The third lecture discusses implication of the results and future experiments aimed at high-precision measurements of the nucleon spin structure functions.

Hughes, E.

1994-02-01T23:59:59.000Z

12

Mass Quantization and Lepton Theory  

Science Journals Connector (OSTI)

This article discusses some features of mass quantization obtained by the introduction of a continuous inner degree of freedom into a free field. The usual particle interpretation, with discrete mass values, is applicable, as shown in the case of a second-quantized scalar field. A simple class of fermion field equations with unexpected lepton-like properties is also presented and studied in some detail.

Marcel Wellner

1962-03-01T23:59:59.000Z

13

Natural fourth generation of leptons  

E-Print Network [OSTI]

We consider implications of a fourth generation of leptons, allowing for the most general mass patterns for the fourth generation neutrino. We determine the constraints due to the precision electroweak measurements and outline the signatures to search for at the LHC experiments. As a concrete framework to apply these results we consider the minimal walking technicolor (MWTC) model where the matter content, regarding the electroweak quantum numbers, corresponds to a fourth generation.

Oleg Antipin; Matti Heikinheimo; Kimmo Tuominen

2009-09-14T23:59:59.000Z

14

Neglected heavy leptons at the LHC  

Science Journals Connector (OSTI)

New heavy leptons with standard model gauge couplings have well-determined cross sections for pair production. A standard pattern of mass mixing implies that the most likely decays are ???W?? and ???W?. Interestingly there have been no direct searches for heavy leptons with these decays at the LHC. However comparison with several multilepton searches allows us to set new limits on the heavy lepton masses. Three observed excesses in the signal regions prevent us from setting stronger limits.

B. Holdom and M. Ratzlaff

2014-07-18T23:59:59.000Z

15

High energy leptons from muons in transit  

E-Print Network [OSTI]

The differential energy distribution for electrons and taus produced from lepton pair production from muons in transit through materials is numerically evaluated. We use the differential cross section to calculate underground lepton fluxes from an incident atmospheric muon flux, considering contributions from both conventional and prompt fluxes. An approximate form for the charged current differential neutrino cross section is provided and used to calculate single lepton production from atmospheric neutrinos. We compare the fluxes of underground leptons produced from incident muons with those produced from incident neutrinos and photons from muon bremsstrahlung. We discuss their relevance for underground detectors.

Alexander Bulmahn; Mary Hall Reno

2009-12-08T23:59:59.000Z

16

Lepton Flavor Violation at LHC  

E-Print Network [OSTI]

Lepton flavor violation (LFV) within the realm of the Standard Model is forbidden. However recent neutrino experiments strongly suggest neutrino oscillations, giving way to LFV. Beyond SM theories, such as supersymmetry and supergravity also allow LFV. This note reviews the possibility of observing LFV signal in the two general purpose LHC experiments: ATLAS and CMS. It is shown that using the initial LHC luminosity, in about a year, either a discovery can be made or the current LFV limits can be enhanced by an order of magnitude.

N. G. Unel

2005-05-12T23:59:59.000Z

17

Leptonic monotops at the LHC  

Science Journals Connector (OSTI)

We study the possibility of detecting new physics (NP) phenomena at the LHC through a new search strategy looking at the monotop (top plus missing energy) signature which is common to a variety of NP models. We focus on the leptonic top decay mode and study the discovery or exclusion reach of the 2012 LHC data for three example models. Contrary to the hadronic mode, in this case the problematic QCD multijet background can be safely neglected. We find that the key kinematic variable to suppress most of the remaining SM backgrounds is the transverse mass of the charged lepton and missing energy. In fact, one could expect that the single-top production measurements already address the monotop signature in this mode. This is, however, not the case, because in the SM single-top production, the transverse mass has an end point determined by the W mass, while the NP signals typically have an additional source of missing energy. We compare, under the same conditions, our monotop search strategy with existing single-top measurements and find a considerable improvement in the monotop signature reach.

Ezequiel Alvarez; Estefania Coluccio Leskow; Jure Drobnak; Jernej F. Kamenik

2014-01-15T23:59:59.000Z

18

On Symmetric Lepton Mixing Matrices  

E-Print Network [OSTI]

Contrary to the quark mixing matrix, the lepton mixing matrix could be symmetric. We study the phenomenological consequences of this possibility. In particular, we find that symmetry would imply that |U_{e3}| is larger than 0.16, i.e., above its current 2 sigma limit. The other mixing angles are also constrained and CP violating effects in neutrino oscillations are suppressed, even though |U_{e3}| is sizable. Maximal atmospheric mixing is only allowed if the other observables are outside their current 3 sigma ranges, and sin^2 theta_{23} lies typically below 0.5. The Majorana phases are not affected, but the implied values of the solar neutrino mixing angle have some effect on the predictions for neutrinoless double beta decay. We further discuss some formal properties of a symmetric mixing matrix.

Hochmuth, K A; Hochmuth, Kathrin A.; Rodejohann, Werner

2007-01-01T23:59:59.000Z

19

Polarization observables in lepton-deuteron elastic scattering including the lepton mass  

E-Print Network [OSTI]

Expressions for the unpolarized differential cross section and for various polarization observables in the lepton-deuteron elastic scattering, $\\ell+D\\to \\ell+D$, $\\ell=e$, $\\mu$, $\\tau$, have been obtained in one-photon-exchange approximation, taking into account the lepton mass. Polarization effects have been investigated for the case of a polarized lepton beam and polarized deuteron target which can have vector or tensor polarization. Numerical estimations of the lepton mass effects have been done for the unpolarized differential cross section and for some polarization observables and applied to the case of low energy muon deuteron elastic scattering.

G. I. Gakh; A. G. Gakh; E. Tomasi--Gustafsson

2014-03-10T23:59:59.000Z

20

Search for Lepton-Flavor and Lepton-Number Violation in the Decay tau to lhh'  

SciTech Connect (OSTI)

A search for lepton-flavor and lepton-number violation in the decay of the tau lepton into one charged lepton and two charged hadrons is performed using 221.4 fb{sup -1} of data collected at an e{sup +}e{sup -} center-of-mass energy of 10.58 GeV with the BABAR detector at the PEP-II storage ring. In all 14 decay modes considered, the observed data are compatible with background expectations, and upper limits are set in the range {Beta}({tau} {yields} {ell}hh') < (0.7-4.8) x 10{sup -7} at 90% confidence level.

Aubert, B.; Barate, R.; Boutigny, D.; Couderc, F.; Karyotakis, Y.; Lees, J.P.; Poireau, V.; Tisserand, V.; Zghiche, A.; /Annecy, LAPP; Grauges, E.; /Barcelona, IFAE; Palano, A.; Pappagallo, M.; Pompili, A.; /Bari U. /INFN, Bari; Chen, J.C.; Qi, N.D.; Rong, G.; Wang, P.; Zhu, Y.S.; /Beijing, Inst. High Energy Phys.; Eigen, G.; Ofte, I.; Stugu, B. /Bergen U. /LBL, Berkeley /UC, Berkeley /Birmingham U. /Ruhr U., Bochum /Bristol U. /British Columbia U. /Brunel U. /Novosibirsk, IYF /UC, Irvine /UCLA /UC, Riverside /UC, San

2005-06-29T23:59:59.000Z

Note: This page contains sample records for the topic "leptons leptons leptons" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


21

Four leptons final states from $??$ fusion  

E-Print Network [OSTI]

I present a systematic study of all possible four leptons final states from $\\gamma\\gamma$ collisions. It is given a detailed account of fermion masses effects which are sizable since several collinear and $t$ channel enancements occur. The effects of angular cuts on the final charged leptons are also discussed. To perform the computation I have used the recently developed ALPHA algorithm (and the resulting code) for the automatic computation of scattering amplitudes.

Mauro Moretti

1996-06-04T23:59:59.000Z

22

The Lepton Sector of a Fourth Generation  

E-Print Network [OSTI]

In extensions of the standard model with a heavy fourth generation one important question is what makes the fourth-generation lepton sector, particularly the neutrinos, so different from the lighter three generations. We study this question in the context of models of electroweak symmetry breaking in warped extra dimensions, where the flavor hierarchy is generated by the localization of the zero-mode fermions in the extra dimension. In this setup the Higgs sector is localized near the infrared brane, whereas the Majorana mass term is localized at the ultraviolet brane. As a result, light neutrinos are almost entirely Majorana particles, whereas the fourth generation neutrino is mostly a Dirac fermion. We show that it is possible to obtain heavy fourth-generation leptons in regions of parameter space where the light neutrino masses and mixings are compatible with observation. We study the impact of these bounds, as well as the ones from lepton flavor violation, on the phenomenology of these models.

Gustavo Burdman; Leandro Da Rold; Ricardo D. Matheus

2010-05-10T23:59:59.000Z

23

Probing lepton number violation on three frontiers  

SciTech Connect (OSTI)

Neutrinoless double beta decay constitutes the main probe for lepton number violation at low energies, motivated by the expected Majorana nature of the light but massive neutrinos. On the other hand, the theoretical interpretation of the (non-)observation of this process is not straightforward as the Majorana neutrinos can destructively interfere in their contribution and many other New Physics mechanisms can additionally mediate the process. We here highlight the potential of combining neutrinoless double beta decay with searches for Tritium decay, cosmological observations and LHC physics to improve the quantitative insight into the neutrino properties and to unravel potential sources of lepton number violation.

Deppisch, Frank F. [Department of Physics and Astronomy, University College London (United Kingdom)

2013-12-30T23:59:59.000Z

24

Martin Perl and the Tau Lepton  

Office of Scientific and Technical Information (OSTI)

Martin Perl and the Tau Lepton Martin Perl and the Tau Lepton Resources with Additional Information 'Martin L. Perl, a professor at the Stanford Linear Accelerator Center (SLAC), [was] awarded the 1995 Nobel Prize in physics ... for his 1975 discovery of a new elementary particle known as the tau lepton. ... The tau lepton is a superheavy cousin of the electron, the carrier of electrical current in household appliances. The two particles are identical in all respects except that the tau is more than 3,500 times heavier than the electron and survives less than a trillionth of a second, whereas the electron is stable. Martin Perl Courtesy AIP Emilio Segrè Visual Archives, W.F. Meggers Gallery of Nobel Laureates In the mid-1970s, working at the Stanford Positron-Electron Asymmetric Ring (SPEAR) in collaboration with 30 other physicists from SLAC and Lawrence Berkeley National Laboratory, Perl began to find events recorded by the detector that could not be explained by any of the known subatomic particles. After more than a year of analysis, Perl was able to convince the rest of his research team that they were in fact observing a new and different type of elementary particle, which he named the 'tau'.

25

Lepton flavor violation at the CERN LHC  

Science Journals Connector (OSTI)

Recent results from Super Kamiokande suggest ??-?? mixing and hence lepton flavor violation. In supersymmetric models, this flavor violation may have implications for the pattern of slepton masses and mixings. Possible signals for this mixing in the decays of sleptons produced at the CERN LHC are discussed. The sensitivity expected is compared to that of rare decays such as ????.

I. Hinchliffe and F. E. Paige

2001-05-02T23:59:59.000Z

26

Tutorial guide to the tau lepton and close-mass lepton pairs  

SciTech Connect (OSTI)

This is a tutorial guide to present knowledge of the tau lepton, to the tau decay mode puzzle, and to present searches for close-mass lepton pairs. The test is minimal; the emphasis is on figures, tables and literature references. It is based on a lecture given at the 1988 International School of Subnuclear Physics: The Super World III. 54 refs., 9 figs., 7 tabs.

Perl, M.L.

1988-10-01T23:59:59.000Z

27

Measurement of Z decays into lepton pairs  

Science Journals Connector (OSTI)

We present measurements by the Mark II experiment of the ratios of the leptonic partial widths of the Z boson to the hadronic partial width. The results are ?ee/?had=0.037-0.012+0.016, &=0.053-0.0150.020, and ???/?had=0.066-0.017+0.021, in good agreement with the standard-model prediction of 0.048. From the average leptonic width result, ?ll/?had=0.053-0.009+0.010, we derive ?had=1.56-0.24+0.28 GeV. We find for the vector coupling constants of the tau and muon v?2=0.310.31-0.30+0.43 and v?2=0.050.30-0.23+0.34.

G. S. Abrams et al.

1989-12-25T23:59:59.000Z

28

Simplified unitarity triangles for the lepton sector  

SciTech Connect (OSTI)

Encouraged by the latest SNO results, we consider the lepton mixing matrix in the approximation that the {nu}{sub 2} mass eigenstate is trimaximally (democratically) mixed. This suggests a new parameterization of the remaining mixing degrees of freedom, which eschews mixing angles, dealing instead, directly with the complex parameter U{sub e3} of the mixing matrix. Unitarity triangles then take a particularly simple form, which we hope will facilitate comparison with experiment.

Bjorken, James D. [Stanford Linear Accelerator Center, Stanford University, Stanford, California 94309 (United States); Harrison, P. F. [Department of Physics, University of Warwick, Coventry CV4 7AL (United Kingdom); Scott, W. G. [CCLRC Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 0QX, UK (United Kingdom)

2006-10-01T23:59:59.000Z

29

Semileptonic lepton-number- and/or lepton-flavor-violating ? decays in Majorana neutrino models  

Science Journals Connector (OSTI)

Motivated by the recent investigation of neutrinoless ?-lepton decays by the CLEO Collaboration, we perform a systematic analysis of such decays in a possible new-physics scenario with heavy Dirac and/or Majorana neutrinos, including heavy-neutrino nondecoupling effects, finite quark masses, and quark as well as meson mixings. We find that the ? lepton decays into an electron or muon and a pseudoscalar or vector meson can have branching ratios close to the experimental sensitivity. Numerical estimates show that the predominant decay modes of this kind are ?-?e-?, ?-?e-?0, and ?-?e-?0, with branching ratios of the order of 10-6.

A. Ilakovac, B. A. Kniehl, and A. Pilaftsis

1995-10-01T23:59:59.000Z

30

Lepton-Flavor-Violating Tau Decays at BaBar  

SciTech Connect (OSTI)

We present the most recent searches for lepton-flavor-violating (LFV) {tau} decays in BABAR. We find no evidence of {tau} decaying to three charged leptons or to a charged lepton and a neutral meson (K{sub S}{sup 0}, {rho}, {phi}, K*{sup 0}, {bar K}*{sup 0}), and set upper limits on the corresponding branching fractions (BF) between 1.8 and 19 x 10{sup -8} at 90% confidence level (CL).

Marchiori, G.; /Paris, LPTHE

2012-04-09T23:59:59.000Z

31

Performance of ?q-lepton reconstruction and identification in CMS  

SciTech Connect (OSTI)

The performance of tau-lepton reconstruction and identification algorithms is studied using a data sample of proton-proton collisions at sqrt(s)=7 TeV, corresponding to an integrated luminosity of 36 inverse picobarns collected with the CMS detector at the LHC. The tau leptons that decay into one or three charged hadrons, zero or more short-lived neutral hadrons, and a neutrino are identified using final-state particles reconstructed in the CMS tracker and electromagnetic calorimeter. The reconstruction efficiency of the algorithms is measured using tau leptons produced in Z-boson decays. The tau-lepton misidentification rates for jets and electrons are determined.

Chatrchyan, Serguei; et al.

2012-01-01T23:59:59.000Z

32

Testing solar lepton mixing sum rules in neutrino oscillation experiments  

E-Print Network [OSTI]

Small discrete family symmetries such as S4, A4 or A5 may lead to simple leading-order predictions for the neutrino mixing matrix such as the bimaximal, tribimaximal or golden ratio mixing patterns, which may be brought into agreement with experimental data with the help of corrections from the charged-lepton sector. Such scenarios generally lead to relations among the parameters of the physical leptonic mixing matrix known as solar lepton mixing sum rules. In this article, we present a simple derivation of such solar sum rules, valid for arbitrary neutrino and charged lepton mixing angles and phases, assuming only {\\theta}13^{\

Ballett, Peter; Luhn, Christoph; Pascoli, Silvia; Schmidt, Michael A

2014-01-01T23:59:59.000Z

33

First search for CP violation in tau lepton decay  

E-Print Network [OSTI]

We have performed the first search for CP violation in tau lepton decay. CP violation in lepton decay does not occur in the minimal standard model but can occur in extensions such as the multi-Higgs doublet model. It appears as a characteristic...

Ammar, Raymond G.; Baringer, Philip S.; Bean, Alice; Besson, David Zeke; Coppage, Don; Darling, C.; Davis, Robin E. P.; Kotov, S.; Kravchenko, I.; Kwak, Nowhan; Zhou, L.

1998-11-01T23:59:59.000Z

34

New Paradigm for Baryon and Lepton Number Violation  

E-Print Network [OSTI]

The possible discovery of proton decay, neutron-antineutron oscillation, neutrinoless beta decay in low energy experiments, and exotic signals related to the violation of the baryon and lepton numbers at collider experiments will change our understanding of the conservation of fundamental symmetries in nature. In this review we discuss the rare processes due to the existence of baryon and lepton number violating interactions. The simplest grand unified theories and the neutrino mass generation mechanisms are discussed. The theories where the baryon and lepton numbers are defined as local gauge symmetries spontaneously broken at the low scale are discussed in detail. The simplest supersymmetric gauge theory which predicts the existence of lepton number violating processes at the low scale is investigated. The main goal of this review is to discuss the main implications of baryon and lepton number violation in physics beyond the Standard Model.

Perez, Pavel Fileviez

2015-01-01T23:59:59.000Z

35

Measurement of the Inclusive Leptonic Asymmetry in Top-Quark Pairs that Decay to Two Charged Leptons at CDF  

SciTech Connect (OSTI)

We measure the inclusive forward-backward asymmetry of the charged-lepton pseudorapidities from top-quark pairs produced in proton-antiproton collisions, and decaying to final states that contain two charged leptons (electrons or muons), using data collected with the Collider Detector at Fermilab.

Aaltonen, Timo Antero; et al.,

2014-07-23T23:59:59.000Z

36

Lepton-Flavor Violation in the Left-handed Slepton Production at Future Lepton Colliders  

E-Print Network [OSTI]

The Super-Kamiokande atmospheric neutrino data suggest existence of the large lepton-flavor violating (LFV) interaction in the higher energy scale. If the minimal supersymmetric standard model is extended to have right-handed neutrinos, the left-handed sleptons in the second and third generations are expected to have the LFV masses in the minimal supergravity scenario. In this article we study the LFV signals in the left-handed slepton production at $\\mu^+\\mu^-$ colliders and $\\e^+\\e^-$ linear colliders (LC's), $\\mu^+\\mu^-(\\e^+\\e^-)\\to\\tau\\mu +4jets + \\E$ and $\\mu^+\\mu^-(\\e^+\\e^-)\\to\\tau\\mu l+ 2jets+ \\E$. The main background comes from decay of a tau lepton into a muon in the lepton-flavor conserving slepton pair production. They are significantly reduced by the energy and the impact parameter cuts for the muon. At $\\mu^+\\mu^-$ colliders (LC's) it may be possible to reach the mixing angle $\\sin 2\\theta_{\\tilde{\

Junji Hisano; Mihoko M. Nojiri; Yasuhiro Shimizu; Minoru Tanaka

1998-08-25T23:59:59.000Z

37

Little Flavor: Heavy Leptons, Z' and Higgs Phenomenology  

E-Print Network [OSTI]

The Little Flavor model is a close cousin of the Little Higgs theory which aims to generate flavor structure around TeV scale. While the original Little Flavor only included the quark sector, here we build the lepton part of the Little Flavor model and explore its phenomenology. The model produces the neutrino mixing matrix and Majorana masses of the Standard Model neutrinos through coupling to heavy lepton partners and Little Higgses. We combine the usual right-handed seesaw mechanism with global symmetry protection to suppress the Standard Model neutrino masses, and identify the TeV partners of leptons as right-handed Majorana neutrinos. The lepton masses and mixing matrix are calculated perturbatively in the theory. The TeV new gauge bosons have suppressed decay width in dilepton channels. Even assuming the Standard Model couplings, the branching ratios to normal dilepton channels are largely reduced in the model, to evade the bound from current $Z'$ search. It also opens up the new search channels for exotic gauge bosons, especially Z' -> E_{t missing} + multi L. The multiple lepton partners will create new chain decay signals in flavor related processes in colliders, which also give rise to flavor anomalies. The lepton flavor violation process can be highly suppressed in charged lepton sector and happens only through neutrinos.

Sichun Sun

2014-12-01T23:59:59.000Z

38

CP nonconservation in the leptonic sector  

E-Print Network [OSTI]

In this paper we use an exact method to impose unitarity on moduli of neutrino PMNS matrix recently determined, and show how one could obtain information on CP nonconservation from a limited experimental information. One suggests a novel type of global fit by expressing all theoretical quantities in terms of convention independent parameters: the Jarlskog invariant $J$ and the moduli $|U_{\\alpha i}|$, able to resolve the positivity problem of $|U_{e 3}|$. In this way the fit will directly provide a value for $J$, and if it is different from zero it will prove the existence of CP violation in the available experimental data. If the best fit result, $|U_{e3}|^2<0$, from M. Maltoni {\\em et al}, [New J.Phys. {\\bf 6} (2004) 122] is confirmed, it will imply a new physics in the leptonic sector.

Petre Dita

2011-01-21T23:59:59.000Z

39

CP nonconservation in the leptonic sector  

E-Print Network [OSTI]

In this paper we use an exact method to impose unitarity on moduli of the neutrino PMNS matrix recently determined, and show how one could obtain information on CP non-conservation from a limited experimental information. One suggests a novel type of global fit by expressing all the theoretical quantities in terms of convention independent parameters: the Jarlskog invariant $J$ and the moduli $|U_{\\alpha i}|$, able to resolve the positivity problem of $|U_{e 3}|$. In this way the fit will directly provide a value for $J$, and if it is different from zero it will prove the existence of CP violation in the available experimental data. If the best fit result, $|U_{e3}|^2<0$, from M. Maltoni {\\em et al}, New J.Phys. {\\bf 6} (2004) 122 is confirmed, it will imply a new physics in the leptonic sector.

Petre Dita

2006-03-06T23:59:59.000Z

40

Isolated leptons in events with missing transverse momentum and the search for single top production  

E-Print Network [OSTI]

Calorimeter · Optimised for precision measure- ment of the scattered lepton ZEUS · Depleted Uranium

Note: This page contains sample records for the topic "leptons leptons leptons" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


41

Measurement of the Topological Branching Fractions of the ? Lepton  

E-Print Network [OSTI]

We report new and precise measurements of the decay branching fractions of the ? lepton to one and three charged particles. The data, corresponding to an integrated luminosity of 176 pb(?1), were collected by the high ...

Baringer, Philip S.

1985-08-05T23:59:59.000Z

42

Leptonic $D_s$ decays at $B$-factories  

E-Print Network [OSTI]

We review recent measurements of leptonic $D_s$-meson decays performed by Belle and BaBar collaborations. Described measurements enable experimental extraction of the $D_s$-meson decay constant which can be compared with lattice QCD calculations.

A. Zupanc

2013-01-30T23:59:59.000Z

43

Quark-lepton symmetric model at the LHC  

Science Journals Connector (OSTI)

We investigate the quark-lepton symmetric model of Foot and Lew in the context of the Large Hadron Collider (LHC). In this bottom-up extension to the standard model, quark-lepton symmetry is achieved by introducing a gauged leptonic color symmetry which is spontaneously broken above the electroweak scale. If this breaking occurs at the TeV scale, then we expect new physics to be discovered at the LHC. We examine three areas of interest: the Z? heavy neutral gauge boson, charge 1/2 exotic leptons, and a color triplet scalar diquark. We find that the LHC has already explored and/or will explore new parameter space for these particles over the course of its lifetime.

Jackson D. Clarke; Robert Foot; Raymond R. Volkas

2012-04-10T23:59:59.000Z

44

Leptonic B Decays at BaBar  

SciTech Connect (OSTI)

The authors will present the most recent results on leptonic B decays B{sup {+-}(0)} {yields} K*{sup {+-}(0)} {nu}{bar {nu}} and B{sup {+-}} {yields} {mu}{sup {+-}}{nu}, based on the data collected by the BaBar detector at PEP-II, an asymmetric e{sup +}e{sup -} collider at the center of mass energy of the {Upsilon}(4S) resonance. Rare B decays have always been a standard probe for New Physics (NP) searches. The very low Standard Model (SM) rate of these decays often make them unaccessible with the present experimental datasets, unless NP effects enhance the rate up to the current experimental sensitivity. Moreover, as NP effects can modify the decay kinematic, particular attention must be payed in order to perform a model independent analysis. A B-Factory provides an unique environment where to investigate these processes. The high number of B{bar B} pairs produced by a B-Factory often allows to approach the needed experimental sensitivity. Moreover, the clean environment and the closed kinematic of the initial state enable to obtaining a very pure sample where to look for these decays.

Monorchio, Diego; /INFN, Naples /Naples U.

2011-09-13T23:59:59.000Z

45

Measurement of the inclusive leptonic asymmetry in top-quark pairs that decay to two charged leptons at CDF  

E-Print Network [OSTI]

We measure the inclusive forward-backward asymmetry of the charged-lepton pseudorapidities from top-quark pairs produced in proton-antiproton collisions, and decaying to final states that contain two charged leptons (electrons or muons), using data collected with the Collider Detector at Fermilab. With an integrated luminosity of 9.1 $\\rm{fb}^{-1}$, the leptonic forward-backward asymmetry, $A_{\\text{FB}}^{\\ell}$, is measured to be $0.072 \\pm 0.060$ and the leptonic pair forward-backward asymmetry, $A_{\\text{FB}}^{\\ell\\ell}$, is measured to be $0.076 \\pm 0.082$, compared with the standard model predictions of $A_{\\text{FB}}^{\\ell} = 0.038 \\pm 0.003$ and $A_{\\text{FB}}^{\\ell\\ell} = 0.048 \\pm 0.004$, respectively. Additionally, we combine the $A_{\\text{FB}}^{\\ell}$ result with a previous determination from a final state with a single lepton and hadronic jets and obtain $A_{\\text{FB}}^{\\ell} = 0.090^{+0.028}_{-0.026}$.

CDF Collaboration; T. Aaltonen; S. Amerio; D. Amidei; A. Anastassov; A. Annovi; J. Antos; G. Apollinari; J. A. Appel; T. Arisawa; A. Artikov; J. Asaadi; W. Ashmanskas; B. Auerbach; A. Aurisano; F. Azfar; W. Badgett; T. Bae; A. Barbaro-Galtieri; V. E. Barnes; B. A. Barnett; P. Barria; P. Bartos; M. Bauce; F. Bedeschi; S. Behari; G. Bellettini; J. Bellinger; D. Benjamin; A. Beretvas; A. Bhatti; K. R. Bland; B. Blumenfeld; A. Bocci; A. Bodek; D. Bortoletto; J. Boudreau; A. Boveia; L. Brigliadori; C. Bromberg; E. Brucken; J. Budagov; H. S. Budd; K. Burkett; G. Busetto; P. Bussey; P. Butti; A. Buzatu; A. Calamba; S. Camarda; M. Campanelli; F. Canelli; B. Carls; D. Carlsmith; R. Carosi; S. Carrillo; B. Casal; M. Casarsa; A. Castro; P. Catastini; D. Cauz; V. Cavaliere; M. Cavalli-Sforza; A. Cerri; L. Cerrito; Y. C. Chen; M. Chertok; G. Chiarelli; G. Chlachidze; K. Cho; D. Chokheli; A. Clark; C. Clarke; M. E. Convery; J. Conway; M. Corbo; M. Cordelli; C. A. Cox; D. J. Cox; M. Cremonesi; D. Cruz; J. Cuevas; R. Culbertson; N. d'Ascenzo; M. Datta; P. de Barbaro; L. Demortier; L. Marchese; M. Deninno; F. Devoto; M. D'Errico; A. Di Canto; B. Di Ruzza; J. R. Dittmann; M. D'Onofrio; S. Donati; M. Dorigo; A. Driutti; K. Ebina; R. Edgar; A. Elagin; R. Erbacher; S. Errede; B. Esham; S. Farrington; J. P. Fernndez Ramos; R. Field; G. Flanagan; R. Forrest; M. Franklin; J. C. Freeman; H. Frisch; Y. Funakoshi; C. Galloni; A. F. Garfinkel; P. Garosi; H. Gerberich; E. Gerchtein; S. Giagu; V. Giakoumopoulou; K. Gibson; C. M. Ginsburg; N. Giokaris; P. Giromini; G. Giurgiu; V. Glagolev; D. Glenzinski; M. Gold; D. Goldin; A. Golossanov; G. Gomez; G. Gomez-Ceballos; M. Goncharov; O. Gonzlez Lpez; I. Gorelov; A. T. Goshaw; K. Goulianos; E. Gramellini; S. Grinstein; C. Grosso-Pilcher; R. C. Group; J. Guimaraes da Costa; S. R. Hahn; J. Y. Han; F. Happacher; K. Hara; M. Hare; R. F. Harr; T. Harrington-Taber; K. Hatakeyama; C. Hays; J. Heinrich; M. Herndon; A. Hocker; Z. Hong; W. Hopkins; S. Hou; R. E. Hughes; U. Husemann; M. Hussein; J. Huston; G. Introzzi; M. Iori; A. Ivanov; E. James; D. Jang; B. Jayatilaka; E. J. Jeon; S. Jindariani; M. Jones; K. K. Joo; S. Y. Jun; T. R. Junk; M. Kambeitz; T. Kamon; P. E. Karchin; A. Kasmi; Y. Kato; W. Ketchum; J. Keung; B. Kilminster; D. H. Kim; H. S. Kim; J. E. Kim; M. J. Kim; S. B. Kim; S. H. Kim; Y. K. Kim; Y. J. Kim; N. Kimura; M. Kirby; K. Knoepfel; K. Kondo; D. J. Kong; J. Konigsberg; A. V. Kotwal; M. Kreps; J. Kroll; M. Kruse; T. Kuhr; M. Kurata; A. T. Laasanen; S. Lammel; M. Lancaster; K. Lannon; G. Latino; H. S. Lee; J. S. Lee; S. Leo; S. Leone; J. D. Lewis; A. Limosani; E. Lipeles; A. Lister; H. Liu; Q. Liu; T. Liu; S. Lockwitz; A. Loginov; A. Luc; D. Lucchesi; J. Lueck; P. Lujan; P. Lukens; G. Lungu; J. Lys; R. Lysak; R. Madrak; P. Maestro; S. Malik; G. Manca; A. Manousakis-Katsikakis; F. Margaroli; P. Marino; M. Martnez; K. Matera; M. E. Mattson; A. Mazzacane; P. Mazzanti; R. McNulty; A. Mehta; P. Mehtala; C. Mesropian; T. Miao; D. Mietlicki; A. Mitra; H. Miyake; S. Moed; N. Moggi; C. S. Moon; R. Moore; M. J. Morello; A. Mukherjee; Th. Muller; P. Murat; M. Mussini; J. Nachtman; Y. Nagai; J. Naganoma; I. Nakano; A. Napier; J. Nett; C. Neu; T. Nigmanov; L. Nodulman; S. Y. Noh; O. Norniella; L. Oakes; S. H. Oh; Y. D. Oh; I. Oksuzian; T. Okusawa; R. Orava; L. Ortolan; C. Pagliarone; E. Palencia; P. Palni; V. Papadimitriou; W. Parker; G. Pauletta; M. Paulini; C. Paus; T. J. Phillips; G. Piacentino; E. Pianori; J. Pilot; K. Pitts; C. Plager; L. Pondrom; S. Poprocki; K. Potamianos; F. Prokoshin; A. Pranko; F. Ptohos; G. Punzi; N. Ranjan; I. Redondo Fernndez; P. Renton; M. Rescigno; F. Rimondi; L. Ristori; A. Robson; T. Rodriguez; S. Rolli; M. Ronzani; R. Roser; J. L. Rosner; F. Ruffini; A. Ruiz; J. Russ; V. Rusu; W. K. Sakumoto; Y. Sakurai; L. Santi; K. Sato; V. Saveliev; A. Savoy-Navarro; P. Schlabach; E. E. Schmidt; T. Schwarz; L. Scodellaro; F. Scuri; S. Seidel; Y. Seiya; A. Semenov; F. Sforza; S. Z. Shalhout; T. Shears; P. F. Shepard; M. Shimojima; M. Shochet; I. Shreyber-Tecker; A. Simonenko; K. Sliwa; J. R. Smith; F. D. Snider; V. Sorin; H. Song; M. Stancari; R. St. Denis; D. Stentz; J. Strologas; Y. Sudo; A. Sukhanov; I. Suslov; K. Takemasa; Y. Takeuchi; J. Tang; M. Tecchio; P. K. Teng; J. Thom; E. Thomson; V. Thukral; D. Toback; S. Tokar; K. Tollefson; T. Tomura; D. Tonelli; S. Torre; D. Torretta; P. Totaro; M. Trovato; F. Ukegawa; S. Uozumi; F. Vzquez; G. Velev; C. Vellidis; C. Vernieri; M. Vidal; R. Vilar; J. Vizn; M. Vogel; G. Volpi; P. Wagner; R. Wallny; S. M. Wang; D. Waters; W. C. Wester III; D. Whiteson; A. B. Wicklund; S. Wilbur; H. H. Williams; J. S. Wilson; P. Wilson; B. L. Winer; P. Wittich; S. Wolbers; H. Wolfe; T. Wright; X. Wu; Z. Wu; K. Yamamoto; D. Yamato; T. Yang; U. K. Yang; Y. C. Yang; W. -M. Yao; G. P. Yeh; K. Yi; J. Yoh; K. Yorita; T. Yoshida; G. B. Yu

2014-04-14T23:59:59.000Z

46

A new bridge between leptonic CP violation and leptogenesis  

E-Print Network [OSTI]

Flavor effects due to lepton interactions in the early Universe may have played an important role in the generation of the cosmological baryon asymmetry through leptogenesis. If the only source of high-energy CP violation comes from the left-handed leptonic sector, then it is possible to establish a bridge between flavored leptogenesis and low-energy leptonic CP violation. We explore this connection taking into account our present knowledge about low-energy neutrino parameters and the matter-antimatter asymmetry observed in the Universe. In this framework, we find that leptogenesis favors a hierarchical light neutrino mass spectrum, while for quasi-degenerate and inverted hierarchical neutrino masses there is a very narrow allowed window. The absolute neutrino mass scale turns out to be m < 0.1 eV.

G. C. Branco; R. Gonzalez Felipe; F. R. Joaquim

2006-09-28T23:59:59.000Z

47

Nuclear PDF for neutrino and charged lepton data  

E-Print Network [OSTI]

Neutrino Deep Inelastic Scattering on nuclei is an essential process to constrain the strange quark parton distribution functions in the proton. The critical component on the way to using the neutrino DIS data in a proton PDF analysis is understanding the nuclear effects in parton distribution functions. We parametrize these effects by nuclear parton distribution functions. Here we compare results from two analysis of NPDF both done at next-to-leading order in QCD. The first uses neutral current charged-lepton lA Deeply Inelastic Scattering and Drell-Yan data for several nuclear targets and the second uses neutrino-nucleon DIS data. We compare the nuclear corrections factors F_2^Fe/F_2^D for the charged-lepton data with other results from the literature. In particular, we compare and contrast fits based upon the charged-lepton DIS data with those using neutrino-nucleon DIS data.

K. Kovarik

2010-12-13T23:59:59.000Z

48

Relating quarks and leptons with the T7 flavour group  

E-Print Network [OSTI]

In this letter we present a model for quarks and leptons based on T7 as flavour symmetry, predicting a canonical mass relation between charged leptons and down-type quarks proposed earlier. Neutrino masses are generated through a Type-I seesaw mechanism, with predicted correlations between the atmospheric mixing angle and neutrino masses. Compatibility with oscillation results lead to lower bounds for the lightest neutrino mass as well as for the neutrinoless double beta decay rates, even for normal neutrino mass hierarchy.

Cesar Bonilla; Stefano Morisi; Eduardo Peinado; Jose W. F. Valle

2014-11-18T23:59:59.000Z

49

Searches for Leptonic B Decays at BaBar  

SciTech Connect (OSTI)

The authors present the most recent results on the leptonic B decays B {yields} lv, B {yields} lv{gamma}, based on the data collected by the BABAR experiment at PEP-II, an asymmetric e{sup +}e{sup -} collider at the center of mass energy of the {Upsilon}(4S) resonance. Leptonic B decays are an excellent probe for new Physics, branching fraction measurements being complementary to the direct searches at high energy machines. Current experimental measurements are in agreement with Standard Model expectations, but, being already capable to constrain parameters of New Physics models today, they will be golden channels for the foreseen super flavor factories.

De Nardo, Guglielmo; /Naples U.

2011-11-11T23:59:59.000Z

50

Relating quarks and leptons with the T7 flavour group  

E-Print Network [OSTI]

In this letter we present a model for quarks and leptons based on T7 as flavour symmetry, predicting a canonical mass relation between charged leptons and down-type quarks proposed earlier. Neutrino masses are generated through a Type-I seesaw mechanism, with predicted correlations between the atmospheric mixing angle and neutrino masses. Compatibility with oscillation results lead to lower bounds for the lightest neutrino mass as well as for the neutrinoless double beta decay rates, even for normal neutrino mass hierarchy.

Bonilla, Cesar; Peinado, Eduardo; Valle, Jose W F

2014-01-01T23:59:59.000Z

51

Leptonic contribution to the bulk viscosity of nuclear matter  

SciTech Connect (OSTI)

For {beta}-equilibrated nuclear matter we estimate the contribution to the bulk viscosity from purely leptonic processes, namely the conversion of electrons to and from muons. For oscillation frequencies in the kilohertz range, we find that this process provides the dominant contribution to the bulk viscosity when the temperature is well below the critical temperature for superconductivity or superfluidity of the nuclear matter.

Alford, Mark G.; Good, Gerald [Physics Department, Washington University, St. Louis, Missouri 63130 (United States)

2010-11-15T23:59:59.000Z

52

Primary Versus Secondary Leptons in the EGRET SNR's  

E-Print Network [OSTI]

The EGRET supernova remnants (SNR's) are all expanding into nearby dense molecular clouds, powering a shock at the interface where protons and electrons accelerate to relativistic energies. A viable mechanism for the emission of gamma$-rays in these sources is the decay of neutral pions created in collisions between the relativistic hadrons and protons in the ambient medium. But neutral pion decay alone cannot reproduce the whole high-energy spectrum, particularly below 100 MeV. A pion-decay scenario thus requires a lepton population to "fill in" the lower part of the spectrum via bremsstrahlung emission. This population, however, is constrained by the SNR radio spectrum. Taking our cue from the behavior of Sgr A East, an energetic EGRET SNR at the Galactic center, we here examine the role played in these sources by secondary leptons--electrons and positrons produced in proton-proton scattering events and the ensuing particle cascades. We show that while secondary leptons cannot account for the gamma-rays below 100 MeV, they can account for the hard radio spectra observed from the EGRET SNR's. Thus, it appears that both primary and secondary leptons may be important contributors to the overall broadband emission from these sources, but if so, must radiate most of their energy in different parts of the SNR-cloud environment. We show that shock acceleration in dense cores being overtaken by the expanding SNR shell can naturally lead to such a scenario.

Marco Fatuzzo; Fulvio Melia

2004-12-17T23:59:59.000Z

53

Tau decays into three charged leptons and two neutrinos  

E-Print Network [OSTI]

We search for the radiative leptonic tau decays tau --> ee(+) e(-)nu(tau)nu(e) and tau --> mu e(+)e(-)nu(tau)nu(mu) using 3.60 fb(-1) of data collected by the CLEO-II experiment at the Cornell Electron Storage Ring. We present a first observation...

Ammar, Raymond G.; Baringer, Philip S.; Bean, Alice; Besson, David Zeke; Coppage, Don; Copty, N.; Davis, Robin E. P.; Hancock, N.; Kotov, S.; Kravchenko, I.; Kwak, Nowhan

1996-04-01T23:59:59.000Z

54

Weak interactions of quarks and leptons: experimental status  

SciTech Connect (OSTI)

The present experimental status of weak interactions is discussed with emphasis on the problems and questions and on the possible lines of future investigations. Major topics include; (1) the quark mixing matrix, (2) CP violation, (3) rare decays, (4) the lepton sector, and (5) right handed currents. 118 references. (WHK)

Wojcicki, S.

1984-09-01T23:59:59.000Z

55

Lepton flavor violation in Z and lepton decays in supersymmetric models  

Science Journals Connector (OSTI)

The observation of charged lepton flavor nonconservation would be a clear signature of physics beyond the standard model. In particular, supersymmetric (SUSY) models introduce mixings in the sneutrino and the charged slepton sectors which could imply flavor-changing processes at rates accessible to upcoming experiments. In this paper we analyze the possibility to observe Z?lIlJ in the GigaZ option of TESLA at DESY. We show that although models with SUSY masses above the current limits could predict a branching ratio BR(Z??e) accessible to the experiment, they would imply an unobserved rate of ??e? and thus are excluded. In models with a small mixing angle between the first and the third (or the second and the third) slepton families GigaZ could observe Z??? (or Z??e) consistently with present bounds on lJ?lI?. In contrast, if the mixing angles between the three slepton families are large the bounds from ??e? push these processes below the reach of GigaZ. We show that in this case the masses of the three slepton families must be strongly degenerated (with mass differences of order 10-3). We update the limits on the slepton mass insertions ?LL,RR,LR and discuss the correlation between flavor changing and g?-2 in SUSY models.

J. I. Illana and M. Masip

2003-02-26T23:59:59.000Z

56

The Particle Adventure | What is the world made of? | Lepton type  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

type conservation type conservation Lepton type conservation Leptons are divided into three lepton families: the electron and its neutrino, the muon and its neutrino, and the tau and its neutrino. We use the terms "electron number," "muon number," and "tau number" to refer to the lepton family of a particle. Electrons and their neutrinos have electron number +1, positrons and their antineutrinos have electron number -1, and all other particles have electron number 0. Muon number and tau number operate analogously with the other two lepton families. One important thing about leptons, then, is that electron number, muon number, and tau number are always conserved when a massive lepton decays into smaller ones. Let's take an example decay.

57

Two Complementary Strategies for New Physics Searches at Lepton Colliders  

SciTech Connect (OSTI)

In this thesis I present two complementary strategies for probing beyond-the-Standard Model physics using data collected in e{sup +}e{sup -} collisions at lepton colliders. One strategy involves searching for effects at low energy mediated by new particles at the TeV mass scale, at which new physics is expected to manifest. Several new physics scenarios, including Supersymmetry and models with leptoquarks or compositeness, may lead to observable rates for charged lepton-flavor violating processes, which are forbidden in the Standard Model. I present a search for lepton-flavor violating decays of the {Upsilon}(3S) using data collected with the BABAR detector. This study establishes the 90% confidence level upper limits BF({Upsilon}(3S) {yields} e{tau}) < 5.0 x 10{sup -6} and BF({Upsilon}(3S) {yields} {mu}{tau}) < 4.1 x 10{sup -6} which are used to place constraints on new physics contributing to lepton-flavor violation at the TeV mass scale. An alternative strategy is to increase the collision energy above the threshold for new particles and produce them directly. I discuss research and development efforts aimed at producing a vertex tracker which achieves the physics performance required of a high energy lepton collider. A small-scale vertex tracker prototype is constructed using Silicon sensors of 50 {mu}m thickness and tested using charged particle beams. This tracker achieves the targeted impact parameter resolution of {sigma}{sub LP} = (5{circle_plus}10 GeV/p{sub T}) as well as a longitudinal vertex resolution of (260 {+-} 10) {mu}m, which is consistent with the requirements of a TeV-scale lepton collider. This detector research and development effort must be motivated and directed by simulation studies of physics processes. Investigation of a dark matter-motivated Supersymmetry scenario is presented, in which the dark matter is composed of Supersymmetric neutralinos. In this scenario, studies of the e{sup +}e{sup -} {yields} H{sup 0}A{sup 0} production process allow for precise measurements of the properties of the A{sup 0} Supersymmetric Higgs boson, which improve the achievable precision on the neutralino dark matter candidate relic density to 8%. Comparison between this quantity and the dark matter density determined from cosmological observations will further our understanding of dark matter by allowing us to determine if it is of Supersymmetric origin.

Hooberman, Benjamin Henry; /SLAC

2009-07-06T23:59:59.000Z

58

A minimal and predictive $T_7$ lepton flavor 331 model  

E-Print Network [OSTI]

We present a model based on the $SU(3)_{C}\\otimes SU(3)_{L}\\otimes U(1)_{X}$ gauge group having an extra $T_{7}\\otimes Z_{3}\\otimes Z_{14}$ flavor group, where the light active neutrino masses arise via double seesaw mechanism and the observed charged lepton mass hierarchy is a consequence of the $Z_{14}$ symmetry breaking at very high energy. In our minimal and predictive $T_7$ lepton flavor 331 model, the spectrum of neutrinos includes very light active neutrinos and heavy and very heavy sterile neutrinos. The obtained neutrino mixing parameters and neutrino mass squared splittings are compatible with the neutrino oscillation experimental data, for both normal and inverted hierarchies. The model predicts CP conservation in neutrino oscillations.

Hernndez, A E Crcamo

2015-01-01T23:59:59.000Z

59

Leptonic $CP$ violating Phase in the Yukawaon Model  

E-Print Network [OSTI]

In the so-called "Yukawaon" model, the (effective) Yukawa coupling constants $Y_f^{eff}$ are given by vacuum expectation values (VEVs) of scalars $Y_f$ (Yukawaons) with $3\\times 3$ components. In this brief report, we change VEV forms $\\langle Y_f \\rangle$ in the previous paper into a unified form. Therefore, parameter fitting for quark and lepton masses and mixings is revised. Especially, we obtain predicted values of neutrino mixing $\\sin^2 2\\theta_{13}$ and a leptonic $CP$ violating phase $\\delta_{CP}^\\ell$ which are consistent with the observed curve in the $(\\sin^2 2\\theta_{13}, \\delta_{CP}^\\ell)$ reported by T2K group recently.

Koide, Yoshio

2014-01-01T23:59:59.000Z

60

Radiative leptonic decays of B mesons in QCD  

Science Journals Connector (OSTI)

We compute the form factors parametrizing radiative leptonic decays of heavy mesons B+??e+? for photon energies much larger than ?QCD, where perturbative QCD methods for exclusive processes can be combined with the heavy quark effective theory. The form factors can be reliably obtained in this region in an expansion in powers of ?/E?. The leading term in this expansion displays an additional spin symmetry manifested in the equality of form factors of vector and axial vector currents. The leading twist form factors can be written as the convolution of the B meson light-cone wave function with a hard scattering amplitude, which is explicitly calculated to one-loop order. The Sudakov double logarithms of the form [(?s/?)log2(2E?/?)]n are resummed to all orders. As an application we present a method for determining the CKM matrix element |Vub| from a comparison of photon spectra in B and D radiative leptonic decays.

Gregory P. Korchemsky; Dan Pirjol; Tung-Mow Yan

2000-05-10T23:59:59.000Z

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61

Vacuum neutrino oscillations of solar neutrinos and lepton mass matrices  

Science Journals Connector (OSTI)

We consider the case that the solar neutrino deficit is due to vacuum oscillations. The lepton mass matrices with nearly bimaximal mixings are needed in order to explain both the solar and atmospheric neutrino deficit. A texture with the symmetry of flavor democracy or S3 has been investigated by taking account of the symmetry breaking terms of the charged lepton mass matrix. It is found that predicted mixings can be considerably changed from the neutrino mixings sin22???1 and sin22?atm?8/9 at the symmetric limit. The correlation between |Ue3| and |Ue1Ue2*| is also presented. The test of the model is discussed by focusing on the three flavor analyses in the solar neutrinos, atmospheric neutrinos, and long baseline experiments.

Morimitsu Tanimoto

1998-12-11T23:59:59.000Z

62

Search for Charged Lepton Violation in Narrow Upsilon Decays  

SciTech Connect (OSTI)

Charged lepton flavor violating processes are unobservable in the standard model, but they are predicted to be enhanced in several extensions to the standard model, including supersymmetry and models with leptoquarks or compositeness. We present a search for such processes in a sample of 99 x 10{sup 6} {Upsilon}(2S) decays and 117 x 10{sup 6} {Upsilon}(3S) decays collected with the BABAR detector. We place upper limits on the branching fractions {Beta}({Upsilon}(nS) {yields} e{sup {+-}}{tau}{sup {-+}}) and {Beta}({Upsilon}(nS) {yields} {mu}{sup {+-}}{tau}{sup {-+}}) (n = 2, 3) at the 10{sup -6} level and use these results to place lower limits of order 1 TeV on the mass scale of charged lepton flavor violating effective operators.

Lees, J.P.; Poireau, V.; Prencipe, E.; Tisserand, V.; /Annecy, LAPP; Garra Tico, J.; Grauges, E.; /Barcelona U., ECM; Martinelli, M.; Palano, A.; Pappagallo, M.; /Bari U. /INFN, Bari; Eigen, G.; Stugu, B.; Sun, L.; /Bergen U.; Battaglia, M.; Brown, D.N.; Hooberman, B.; Kerth, L.T.; Kolomensky, Yu.G.; Lynch, G.; Osipenkov, I.L.; Tanabe, T.; /LBL, Berkeley /UC, Berkeley; Hawkes, C.M.; /Birmingham U. /Ruhr U., Bochum /British Columbia U. /Brunel U. /Novosibirsk, IYF /UC, Irvine /UC, Riverside /UC, San Diego /UC, Santa Barbara /UC, Santa Cruz /Caltech /Cincinnati U. /Colorado U. /Colorado State U. /Dortmund U. /Dresden, Tech. U. /Ecole Polytechnique /Edinburgh U. /Ferrara U. /INFN, Ferrara /Frascati /Columbus Supercond., Genova /INFN, Genoa /Indian Inst. Tech., Guwahati /Harvard U. /Heidelberg U. /Humboldt U., Berlin /Imperial Coll., London /Iowa State U. /Iowa State U. /Johns Hopkins U. /Orsay, LAL /LLNL, Livermore /Liverpool U. /Queen Mary, U. of London /Royal Holloway, U. of London /Louisville U. /Mainz U., Inst. Kernphys. /Manchester U. /Maryland U. /Massachusetts U., Amherst /MIT /McGill U. /Consorzio Milano Ricerche /INFN, Milan /Mississippi U. /Montreal U. /Napoli Seconda U. /INFN, Naples /NIKHEF, Amsterdam /Notre Dame U. /Ohio State U. /Oregon U. /Padua U. /INFN, Padua /Paris U., VI-VII /Perugia U. /INFN, Perugia /INFN, Pisa /Princeton U. /Rome U. /INFN, Rome /Rostock U. /Rutherford /DAPNIA, Saclay /SLAC /South Carolina U. /Stanford U., Phys. Dept. /SUNY, Albany /Tel Aviv U. /Tennessee U. /Texas U. /Texas U., Dallas /Turin U. /INFN, Turin /Trieste U. /INFN, Trieste /Valencia U., IFIC /Victoria U. /Warwick U. /Wisconsin U., Madison

2011-08-19T23:59:59.000Z

63

Universality-breaking effects in leptonic Z decays  

Science Journals Connector (OSTI)

We analyze the possibility of universality violation in diagonal leptonic decays of the Z boson, in the context of interfamily seesaw models. In a minimal extension of the standard model with right-handed neutrino fields, we find that universality-breaking effects increase quadratically with the heavy Majorana neutrino mass and may be observed in the current experiments at the CERN e+e- collider LEP.

J. Bernabu; J. G. Krner; A. Pilaftsis; K. Schilcher

1993-10-25T23:59:59.000Z

64

The standard model and the constituents of leptons and quarks  

E-Print Network [OSTI]

A complete set of postulates of the standard model of the electroweak interaction and mass generation is formulated and confirmed deriving the Lagrangian for the standard model. A massive fermion is formed by a right-handed and a left-handed elementary massless fermion, exchanging a scalar doublet. The elementary massless fermions forming leptons belong to an approximate SU(3) octet. The charges are quantised due to this symmetry.

Walter Schmidt-Parzefall

2014-03-04T23:59:59.000Z

65

Lepton Flavour Violation in Tau Decays at BaBar  

SciTech Connect (OSTI)

Recent results from {tau} physics studies at BABAR are presented with an emphasis on Lepton Flavour Violation measurements. The results from the current generation of B-meson Factories are already beginning to constrain the parameter space of models that go beyond the Standard Model. By the end of their data-taking, the current generation of B-meson factories will have produced nearly 2 billion {tau} pair decays. The physics potential of this legacy has only just begun to be exploited.

Wilson, F.F.; /Rutherford

2011-11-07T23:59:59.000Z

66

Lepton flavor violation at linear collider experiments in supersymmetric grand unified theories  

E-Print Network [OSTI]

Lepton flavor violation at linear collider experiments is discussed. We show that detectable lepton flavor violation could occur through scalar lepton pair production and decay in the supersymmetric SU(5) grand unified theory in spite of the stringent present experimental constraints by rare process searches. Possible cross sections about 40fb for an e+e- collider and 280fb for an e-e- collider are illustrated.

Masahide Hirouchi; Minoru Tanaka

1997-12-28T23:59:59.000Z

67

Generalised CP and $\\Delta (6n^2)$ Family Symmetry in Semi-Direct Models of Leptons  

E-Print Network [OSTI]

We perform a detailed analysis of $\\Delta (6n^2)$ family symmetry combined with a generalised CP symmetry in the lepton sector, breaking to different remnant symmetries $G_{\

Ding, Gui-Jun; Neder, Thomas

2014-01-01T23:59:59.000Z

68

The scalar unparticle effect on the charged lepton electric dipole moment  

E-Print Network [OSTI]

We study the charged lepton electric dipole moment which is induced by the scalar unparticle mediation and we predict the appropriate range for the free parameters appearing in the effective lagrangian which drives the unparticle-standard model lepton interactions. We observe that the charged lepton electric dipole moment is strongly sensitive to the scaling dimension d_u of the unparticle and the new couplings in the effective interaction. Furthermore, we see that the current experimental limits of charged lepton electric dipole moments can ensure an appropriate range for these free parameters.

E. O. Iltan

2007-10-14T23:59:59.000Z

69

Searches for Leptonic B Decays at BaBar  

SciTech Connect (OSTI)

Measurements of the branching fractions of purely leptonic decays of B-mesons translate into constraints in the plane of the charged Higgs mass versus tan {beta} which are relatively insensitive to the particular theoretical model. Using the full BABAR dataset of 450 million B-decays we search for these decays. No significant signal is found in the decays into electrons or muons and we set upper limits on the branching fractions of the order of a 10{sup -6} at 90% confidence level. We measure the branching fraction of B {yields} {tau}{mu} to be (1.7 {+-} 0.6) x 10{sup -4}.

Nelson, Silke; /SLAC

2012-04-25T23:59:59.000Z

70

Calorimetry for Lepton Collider Experiments - CALICE results and activities  

E-Print Network [OSTI]

The CALICE collaboration conducts calorimeter R&D for highly granular calorimeters, mainly for their application in detectors for a future lepton collider at the TeV scale. The activities ranges from generic R&D with small devices up to extensive beam tests with prototypes comprising up to several 100000 calorimeter cells. CALICE has validated the performance of particle flow algorithms with test beam data and delivers the proof of principle that highly granular calorimeters can be built, operated and understood. The successes achieved in the past years allows the step from prototypes to calorimeter systems for particle physics detectors to be addressed.

,

2012-01-01T23:59:59.000Z

71

Calorimetry for Lepton Collider Experiments - CALICE results and activities  

E-Print Network [OSTI]

The CALICE collaboration conducts calorimeter R&D for highly granular calorimeters, mainly for their application in detectors for a future lepton collider at the TeV scale. The activities ranges from generic R&D with small devices up to extensive beam tests with prototypes comprising up to several 100000 calorimeter cells. CALICE has validated the performance of particle flow algorithms with test beam data and delivers the proof of principle that highly granular calorimeters can be built, operated and understood. The successes achieved in the past years allows the step from prototypes to calorimeter systems for particle physics detectors to be addressed.

The CALICE Collaboration

2012-12-20T23:59:59.000Z

72

Muon g-2 Anomaly and Dark Leptonic Gauge Boson  

SciTech Connect (OSTI)

One of the major motivations to search for a dark gauge boson of MeV-GeV scale is the long-standing muon g-2 anomaly. Because of active searches such as fixed target experiments and rare meson decays, the muon g-2 favored parameter region has been rapidly reduced. With the most recent data, it is practically excluded now in the popular dark photon model. We overview the issue and investigate a potentially alternative model based on the gauged lepton number or U(1)_L, which is under different experimental constraints.

Lee, Hye-Sung [W& M

2014-11-01T23:59:59.000Z

73

Leptonic CP violation: zero, maximal or between the two extremes  

E-Print Network [OSTI]

Discovery of the CP-violation in the lepton sector is one of the challenges of the particle physics. We search for possible principles, symmetries and phenomenological relations that can lead to particular values of the CP-violating Dirac phase, $\\delta$. In this connection we discuss two extreme cases: the zero phase, $\\delta = 0$, and the maximal CP-violation, $\\delta = \\pm \\pi/2$, and relate them to the peculiar pattern of the neutrino mixing. The maximal CP-violation can be related to the $\

Y. Farzan; A. Yu. Smirnov

2006-10-25T23:59:59.000Z

74

Contribucin de leptones exticos del modelo 331 (=-1/?3)al momento magntico anmalo del mun / Contribution of exotic leptons of 331 (=-1/?3)model to the anomalous magnetic moment at the muon.  

E-Print Network [OSTI]

??Raba Pez, ngela Mercedes (2010) Contribucin de leptones exticos del modelo 331 (=-1/?3)al momento magntico anmalo del mun / Contribution of exotic leptons of 331 (more)

Raba Pez, ngela Mercedes

2010-01-01T23:59:59.000Z

75

Lepton mixing under the lepton charge nonconservation, neutrino masses and oscillations and the 'forbidden' decay Micro-Sign {sup -} {yields} e{sup -} + {gamma}  

SciTech Connect (OSTI)

The lepton-charge (L{sub e}, L{sub {mu}}, L{sub {tau}}) nonconserving interaction leads to the mixing of the electron, muon, and tau neutrinos, which manifests itself in spatial oscillations of a neutrino beam, and also to the mixing of the electron, negative muon, and tau lepton, which, in particular, may be the cause of the 'forbidden' radiative decay of the negative muon into the electron and {gamma} quantum. Under the assumption that the nondiagonal elements of the mass matrices for neutrinos and ordinary leptons, connected with the lepton charge nonconservation, are the same, and by performing the joint analysis of the experimental data on neutrino oscillations and experimental restriction for the probability of the decay Micro-Sign {sup -} {yields} e{sup -} + {gamma} per unit time, the following estimate for the lower bound of neutrino mass has been obtained: m{sup ({nu})} > 1.5 eV/c{sup 2}.

Lyuboshitz, V. L.; Lyuboshitz, V. V., E-mail: Valery.Lyuboshitz@jinr.ru [Joint Institute for Nuclear Research (Russian Federation)

2013-08-15T23:59:59.000Z

76

Search for tau -> gamma mu: A test of lepton number conservation  

E-Print Network [OSTI]

A search for the lepton number violating decay of the tau lepton to the gammamu final state has been performed with the CLEO II detector at the Cornell e+e- storage ring CESR. In a data sample that corresponds to an ...

Ammar, Raymond G.; Ball, S.; Baringer, Philip S.; Coppage, Don; Copty, N.; Davis, Robin E. P.; Hancock, N.; Kelly, M.; Kwak, Nowhan; Lam, H.

1993-01-01T23:59:59.000Z

77

Electron generation of leptons and hadrons with reciprocal -quantized lifetimes and masses  

E-Print Network [OSTI]

1 Electron generation of leptons and hadrons with reciprocal -quantized lifetimes and masses generation occurs via an initial "-leap" from an electron pair to a "platform state" M, and then subsequent in the generation of hadron masses. In fact, the role of the electron in generating lepton masses has never been

78

Photonuclear interaction of high energy muons and tau leptons  

Science Journals Connector (OSTI)

The general formalism for the two-component description of inelastic lepton-nucleon scattering in the diffractive region is proposed. The nonperturbative contribution to electromagnetic structure functions of a nucleon is described by a modified generalized vector dominance model containing special cutoff factors restricting the phase volume of the initial qq pairs of the virtual photons fluctuations. The perturbative QCD contribution is described by the phenomenological model suggested (in nonunitarized form) by Forshaw, Kerley, and Shaw. The formulas needed for a numerical calculation of the photonuclear cross sections integrated over Q2 are presented. It is argued that in the case of photonuclear cross sections at superhigh energies of leptons (E?105 GeV), integrated over Q2, the following two-component scheme is good enough: the nonperturbative contribution is approximated by the old parametrization of Bezrukov and Bugaev, and the perturbative one is described by the model of Forshaw, Kerley, and Shaw with the parameters determined from DESY data. The corresponding results of numerical calculations for the perturbative part are given, for the cases of ?A and ?A scattering at superhigh energies.

E. V. Bugaev and Yu. V. Shlepin

2003-02-28T23:59:59.000Z

79

Quark and lepton masses and mixing in the landscape  

E-Print Network [OSTI]

Even if quark and lepton masses are not uniquely predicted by the fundamental theory, as may be the case in the string theory landscape, nevertheless their pattern may reveal features of the underlying theory. We use statistical techniques to show that the observed masses appear to be representative of a scale invariant distribution, rho(m) ~ 1/m. If we extend this distribution to include all the Yukawa couplings, we show that the resulting CKM matrix elements typically show a hierarchical pattern similar to observations. The Jarlskog invariant measuring the amount of CP violation is also well reproduced in magnitude. We also apply this framework to neutrinos using the seesaw mechanism. The neutrino results are ambiguous, with the observed pattern being statistically allowed even though the framework does not provide a natural explanation for the observed two large mixing angles. Our framework highly favors a normal hierarchy of neutrino masses. We also are able to make statistical predictions in the neutrino sector when we specialize to situations consistent with the known mass differences and two large mixing angles. Within our framework, we show that with 95% confidence the presently unmeasured MNS mixing angle sin theta_{13} is larger than 0.04 and typically of order 0.1. The leptonic Jarlskog invariant is found to be typically of order 10^{-2} and the magnitude of the effective Majorana mass m_{ee} is typically of order 0.001 eV.

John F. Donoghue; Koushik Dutta; Andreas Ross

2006-01-27T23:59:59.000Z

80

Measurement of cross sections and leptonic forward-backward asymmetries at the Z pole and determination of electroweak parameters  

E-Print Network [OSTI]

Measurement of cross sections and leptonic forward-backward asymmetries at the Z pole and determination of electroweak parameters

Acciarri, M; Adriani, O; Aguilar-Bentez, M; Ahlen, S P; Alcaraz, J; Aloisio, A; Alverson, G; Alviggi, M G; Ambrosi, G; An, Q; Anderhub, H; Anderson, A L; Andreev, V P; Angelescu, T; Antonov, L; Antreasyan, D; Alkhazov, G; Arce, P; Arefev, A; Azemoon, T; Aziz, T; Baba, P V K S; Bagnaia, P; Bakken, J A; Baksay, L; Ball, R C; Banerjee, S; Banicz, K; Bao, J; Barillre, R; Barone, L; Baschirotto, A; Battiston, R; Bay, A; Becattini, F; Becker, U; Behner, F; Bencze, G L; Berdugo, J; Berges, P; Bertucci, B; Betev, B L; Biasini, M; Biland, A; Bilei, G M; Bizzarri, R; Blaising, J J; Bobbink, Gerjan J; Bck, R K; Bhm, A; Borgia, B; Bourilkov, D; Bourquin, Maurice; Boutigny, D; Bouwens, B T; Brambilla, Elena; Branson, J G; Brigljevic, V; Brock, I C; Brooks, M; Bujak, A T; Burger, J D; Burger, W J; Burgos, C; Busenitz, J K; Buytenhuijs, A O; Bykov, A; Cai, X D; Capell, M; Caria, M; Carlino, G; Cartacci, A M; Casaus, J; Castello, R; Cavallo, N; Cerrada-Canales, M; Cesaroni, F; Chamizo-Llatas, M; Chang, Y H; Chaturvedi, U K; Chemarin, M; Chen, A; Chen, C; Chen, G; Chen, G M; Chen, H F; Chen, H S; Chen, M; Chiefari, G; Chien, C Y; Choi, M T; Chung, S; Civinini, C; Clare, I; Clare, R; Coan, T E; Cohn, H O; Coignet, G; Colino, N; Contin, A; Costantini, S; Cotorobai, F; de la Cruz, B; Cui, X T; Cui, X Y; Dai, T S; D'Alessandro, R; De Asmundis, R; Degr, A; Deiters, K; Dnes, E; Denes, P; De Notaristefani, F; DiBitonto, Daryl; Diemoz, M; Dimitrov, H R; Dionisi, C; Dittmar, Michael; Djambazov, L; Dova, M T; Drago, E; Duchesneau, D; Duinker, P; Durn, I; Easo, S; El-Mamouni, H; Engler, A; Eppling, F J; Ern, F C; Extermann, Pierre; Fabbretti, R; Fabre, M; Falciano, S; Fan, S J; Favara, A; Fay, J; Felcini, Marta; Ferguson, T; Fernndez, D; Fernndez, G; Ferroni, F; Fesefeldt, H S; Fiandrini, E; Field, J H; Filthaut, Frank; Fisher, P H; Forconi, G; Fredj, L; Freudenreich, Klaus; Friebel, W; Fukushima, M; Gailloud, M; Galaktionov, Yu; Gallo, E; Ganguli, S N; Garca-Abia, P; Gentile, S; Gheordanescu, N; Giagu, S; Goldfarb, S; Gong, Z F; Gonzlez, E; Gougas, Andreas; Goujon, D; Gratta, Giorgio; Grnewald, M W; Gu, C; Guanziroli, M; Guo, J K; Gupta, V K; Gurtu, A; Gustafson, H R; Gutay, L J; Hangarter, K; Hasan, A; Hauschildt, D; He, C F; He, J T; Hebbeker, T; Hebert, M; Herv, A; Hilgers, K; Hofer, H; Hoorani, H; Hou, S R; Hu, G; Hu, G Q; Ille, B; Ilyas, M M; Innocente, Vincenzo; Janssen, H; Jin, B N; Jones, L W; Josa-Mutuberria, I; Kasser, A; Khan, R A; Kamyshkov, Yu A; Kapinos, P; Kapustinsky, J S; Karyotakis, Yu; Kaur, M; Khokhar, S; Kienzle-Focacci, M N; Kim, J K; Kim, S C; Kim, Y G; Kinnison, W W; Kirkby, A; Kirkby, D; Kirsch, S; Kittel, E W; Klimentov, A; Knig, A C; Koffeman, E; Kornadt, O; Koutsenko, V F; Koulbardis, A; Krmer, R W; Kramer, T; Krastev, V R; Krenz, W; Kuijten, H; Kumar, K S; Kunin, A; Ladrn de Guevara, P; Landi, G; Lanske, D; Lanzano, S; Lebedev, A; Lebrun, P; Lecomte, P; Lecoq, P; Le Coultre, P; Lee, D M; Lee Jae Sik; Lee, K Y; Leedom, I D; Leggett, C; Le Goff, J M; Leiste, R; Lenti, M; Leonardi, E; Levchenko, P M; Li Chuan; Li, H T; Li, P J; Liao, J Y; Lin, W T; Lin, Z Y; Linde, Frank L; Lindemann, B; Lista, L; Liu, Y; Lohmann, W; Longo, E; Lu, W; L, Y S; Lubbers, J M; Lbelsmeyer, K; Luci, C; Luckey, D; Ludovici, L; Luminari, L; Lustermann, W; Ma, J M; Ma Wen Gan; MacDermott, M; Malgeri, L; Malik, R; Malinin, A; Maa, C; Maolinbay, M; Marchesini, P A; Marion, F; Marin, A; Martin, J P; Marzano, F; Massaro, G G G; Mazumdar, K; McBride, P; McMahon, T; McNally, D; Merk, M; Merola, L; Meschini, M; Metzger, W J; Mi, Y; Mihul, A; Mills, G B; Mir, Y; Mirabelli, G; Mnich, J; Mller, M; Monteleoni, B; Morand, R; Morganti, S; Moulai, N E; Mount, R; Mller, S; Nagy, E; Napolitano, M; Nessi-Tedaldi, F; Newman, H; Niaz, M A; Nippe, A; Nowak, H; Organtini, G; Pandoulas, D; Paoletti, S; Paolucci, P; Pascale, G; Passaleva, G; Patricelli, S; Paul, T; Pauluzzi, M; Paus, C; Pauss, Felicitas; Pei, Y J; Pensotti, S; Perret-Gallix, D; Perrier, J; Pevsner, A; Piccolo, D; Pieri, M; Pinto, J C; Pirou, P A; Plasil, F; Plyaskin, V; Pohl, M; Pozhidaev, V; Postema, H; Qi, Z D; Qian, J M; Qureshi, K N; Raghavan, R; Rahal-Callot, G; Rancoita, P G; Rattaggi, M; Raven, G; Razis, P A; Read, K; Redaelli, M; Ren, D; Ren, Z; Rescigno, M; Reucroft, S; Ricker, A; Riemann, S; Riemers, W; Riles, K; Rind, O; Rizvi, H A; Ro, S; Robohm, A; Rodrguez-Calonge, F J; Roe, B P; Rhner, M; Rhner, S; Romero, L; Rosier-Lees, S; Rosmalen, R; Rosselet, P; Van Rossum, W; Roth, S; Rubbia, Andr; Rubio, Juan Antonio; Rykaczewski, H; Sachwitz, M; Salicio, J; Salicio, J M; Snchez, E; Sanders, G S; Santocchia, A; Sarakinos, M E; Sartorelli, G; Sassowsky, M; Sauvage, G; Schfer, C; Shchegelskii, V; Schmitz, D; Schmitz, P; Schneegans, M; Scholz, N; Schopper, Herwig Franz; Schotanus, D J; Shotkin, S

1994-01-01T23:59:59.000Z

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81

Multi Leptons in ep Collisions at HERA Analyses of multi-muon & and multi-electron production  

E-Print Network [OSTI]

Multi Leptons in ep Collisions at HERA Analyses of multi-muon & and multi-electron production Boris Lei?ner, RWTH Aachen on behalf of the and collaborations B. Lei?ner, Multi Leptons in ep Collisions - 1 for additional leptons e e e p · Conclusions B. Lei?ner, Multi Leptons in ep Collisions - 2 #12;Outline · How

82

Polarization Effects In The Charged Lepton Pair Production By A Neutrino (Antineutrino) In A Magnetic Field  

SciTech Connect (OSTI)

The probability of the process of the charged lepton pair production by a neutrino (an antineutrino) with allowance for the longitudinal and transverse polarizations of the charged leptons in a magnetic field is presented. The dependence of the probability of the process on the spin variables of the charged leptons and on the azimuthal and polar angles of the initial and final neutrinos (antineutrinos) are investigated. It is shown that the probability of the process is sensitive to the spin variables of the charged leptons and to the direction of the neutrino (antineutrino) momentum. It is determined that the neutrino (antineutrino) energy and momentum loss through the production of a charged lepton pair happens asymmetrically.

Huseynov, Vali A. [Department of General and Theoretical Physics, Nakhchivan State University, AZ 7000, Nakhchivan (Azerbaijan); Laboratory of Physical Research, Nakhchivan Division of Azerbaijan National Academy of Sciences, AZ 7000, Nakhchivan (Azerbaijan); Ahmad, Ali S. [Department of General and Theoretical Physics, Nakhchivan State University, AZ 7000, Nakhchivan (Azerbaijan)

2007-06-13T23:59:59.000Z

83

Precision Measurement of the Mass of the $?$ Lepton  

E-Print Network [OSTI]

An energy scan near the $\\tau$ pair production threshold has been performed using the BESIII detector. About $24$ pb$^{-1}$ of data, distributed over four scan points, was collected. This analysis is based on $\\tau$ pair decays to $ee$, $e\\mu$, $eh$, $\\mu\\mu$, $\\mu h$, $hh$, $e\\rho$, $\\mu\\rho$ and $\\pi\\rho$ final states, where $h$ denotes a charged $\\pi$ or $K$. The mass of the $\\tau$ lepton is measured from a maximum likelihood fit to the $\\tau$ pair production cross section data to be $m_{\\tau} = (1776.91\\pm0.12 ^{+0.10}_{-0.13}$) MeV/$c^2$, which is currently the most precise value in a single measurement.

M. Ablikim; M. N. Achasov; X. C. Ai; O. Albayrak; M. Albrecht; D. J. Ambrose; F. F. An; Q. An; J. Z. Bai; R. Baldini Ferroli; Y. Ban; J. V. Bennett; M. Bertani; J. M. Bian; E. Boger; O. Bondarenko; I. Boyko; S. Braun; R. A. Briere; H. Cai; X. Cai; O. Cakir; A. Calcaterra; G. F. Cao; S. A. Cetin; J. F. Chang; G. Chelkov; G. Chen; H. S. Chen; J. C. Chen; M. L. Chen; S. J. Chen; X. Chen; X. R. Chen; Y. B. Chen; H. P. Cheng; X. K. Chu; Y. P. Chu; D. Cronin-Hennessy; H. L. Dai; J. P. Dai; D. Dedovich; Z. Y. Deng; A. Denig; I. Denysenko; M. Destefanis; W. M. Ding; Y. Ding; C. Dong; J. Dong; L. Y. Dong; M. Y. Dong; S. X. Du; J. Z. Fan; J. Fang; S. S. Fang; Y. Fang; L. Fava; C. Q. Feng; C. D. Fu; O. Fuks; Q. Gao; Y. Gao; C. Geng; K. Goetzen; W. X. Gong; W. Gradl; M. Greco; M. H. Gu; Y. T. Gu; Y. H. Guan; A. Q. Guo; L. B. Guo; T. Guo; Y. P. Guo; Y. P. Guo; Y. L. Han; F. A. Harris; K. L. He; M. He; Z. Y. He; T. Held; Y. K. Heng; Z. L. Hou; C. Hu; H. M. Hu; J. F. Hu; T. Hu; G. M. Huang; G. S. Huang; H. P. Huang; J. S. Huang; L. Huang; X. T. Huang; Y. Huang; T. Hussain; C. S. Ji; Q. Ji; Q. P. Ji; X. B. Ji; X. L. Ji; L. L. Jiang; L. W. Jiang; X. S. Jiang; J. B. Jiao; Z. Jiao; D. P. Jin; S. Jin; T. Johansson; N. Kalantar-Nayestanaki; X. L. Kang; X. S. Kang; M. Kavatsyuk; B. Kloss; B. Kopf; M. Kornicer; W. Kuehn; A. Kupsc; W. Lai; J. S. Lange; M. Lara; P. Larin; M. Leyhe; C. H. Li; Cheng Li; Cui Li; D. Li; D. M. Li; F. Li; G. Li; H. B. Li; J. C. Li; K. Li; K. Li; Lei Li; P. R. Li; Q. J. Li; T. Li; W. D. Li; W. G. Li; X. L. Li; X. N. Li; X. Q. Li; Z. B. Li; H. Liang; Y. F. Liang; Y. T. Liang; D. X. Lin; B. J. Liu; C. L. Liu; C. X. Liu; F. H. Liu; Fang Liu; Feng Liu; H. B. Liu; H. H. Liu; H. M. Liu; J. Liu; J. P. Liu; K. Liu; K. Y. Liu; P. L. Liu; Q. Liu; S. B. Liu; X. Liu; Y. B. Liu; Z. A. Liu; Zhiqiang Liu; Zhiqing Liu; H. Loehner; X. C. Lou; G. R. Lu; H. J. Lu; H. L. Lu; J. G. Lu; X. R. Lu; Y. Lu; Y. P. Lu; C. L. Luo; M. X. Luo; T. Luo; X. L. Luo; M. Lv; F. C. Ma; H. L. Ma; Q. M. Ma; S. Ma; T. Ma; X. Y. Ma; F. E. Maas; M. Maggiora; Q. A. Malik; Y. J. Mao; Z. P. Mao; J. G. Messchendorp; J. Min; T. J. Min; R. E. Mitchell; X. H. Mo; Y. J. Mo; H. Moeini; C. Morales Morales; K. Moriya; N. Yu. Muchnoi; H. Muramatsu; Y. Nefedov; I. B. Nikolaev; Z. Ning; S. Nisar; X. Y. Niu; S. L. Olsen; Q. Ouyang; S. Pacetti; M. Pelizaeus; H. P. Peng; K. Peters; J. L. Ping; R. G. Ping; R. Poling; N. Q.; M. Qi; S. Qian; C. F. Qiao; L. Q. Qin; X. S. Qin; Y. Qin; Z. H. Qin; J. F. Qiu; K. H. Rashid; C. F. Redmer; M. Ripka; G. Rong; X. D. Ruan; A. Sarantsev; K. Schoenning; S. Schumann; W. Shan; M. Shao; C. P. Shen; X. Y. Shen; H. Y. Sheng; M. R. Shepherd; W. M. Song; X. Y. Song; S. Spataro; B. Spruck; G. X. Sun; J. F. Sun; S. S. Sun; Y. J. Sun; Y. Z. Sun; Z. J. Sun; Z. T. Sun; C. J. Tang; X. Tang; I. Tapan; E. H. Thorndike; D. Toth; M. Ullrich; I. Uman; G. S. Varner; B. Wang; D. Wang; D. Y. Wang; K. Wang; L. L. Wang; L. S. Wang; M. Wang; P. Wang; P. L. Wang; Q. J. Wang; S. G. Wang; W. Wang; X. F. Wang; Y. D. Wang; Y. F. Wang; Y. Q. Wang; Z. Wang; Z. G. Wang; Z. H. Wang; Z. Y. Wang; D. H. Wei; J. B. Wei; P. Weidenkaff; S. P. Wen; M. Werner; U. Wiedner; M. Wolke; L. H. Wu; N. Wu; Z. Wu; L. G. Xia; Y. Xia; D. Xiao; Z. J. Xiao; Y. G. Xie; Q. L. Xiu; G. F. Xu; L. Xu; Q. J. Xu; Q. N. Xu; X. P. Xu; Z. Xue; L. Yan; W. B. Yan; W. C. Yan; Y. H. Yan; H. X. Yang; L. Yang; Y. Yang; Y. X. Yang; H. Ye; M. Ye; M. H. Ye; B. X. Yu; C. X. Yu; H. W. Yu; J. S. Yu; S. P. Yu; C. Z. Yuan; W. L. Yuan; Y. Yuan; A. A. Zafar; A. Zallo; S. L. Zang; Y. Zeng; B. X. Zhang; B. Y. Zhang; C. Zhang; C. B. Zhang; C. C. Zhang; D. H. Zhang; H. H. Zhang; H. Y. Zhang; J. J. Zhang; J. Q. Zhang; J. W. Zhang; J. Y. Zhang; J. Z. Zhang; S. H. Zhang; X. J. Zhang; X. Y. Zhang; Y. Zhang; Y. H. Zhang; Z. H. Zhang; Z. P. Zhang; Z. Y. Zhang; G. Zhao; J. W. Zhao; Lei Zhao; Ling Zhao; M. G. Zhao; Q. Zhao; Q. W. Zhao; S. J. Zhao; T. C. Zhao; X. H. Zhao; Y. B. Zhao; Z. G. Zhao; A. Zhemchugov; B. Zheng; J. P. Zheng; Y. H. Zheng; B. Zhong; L. Zhou; Li Zhou; X. Zhou; X. K. Zhou; X. R. Zhou; X. Y. Zhou; K. Zhu; K. J. Zhu; X. L. Zhu; Y. C. Zhu; Y. S. Zhu; Z. A. Zhu; J. Zhuang; B. S. Zou; J. H. Zou

2014-05-05T23:59:59.000Z

84

Higgs Boson Decays to Leptons with the ATLAS Detector  

E-Print Network [OSTI]

A review of the results on Higgs boson decays to leptons with the ATLAS detector is presented. In the Htautau search, using the 8 TeV dataset, there is an excess of data over the background prediction, with an observed (expected) significance corresponding to 4.1$\\sigma$ (3.2$\\sigma$). In the Hmumu search, using approximately 25 fb$^{-1}$ of $pp$ collision data collected at 7 TeV and 8 TeV in 2011 and 2012, the data is consistent with the expected background and a 95\\% confidence level limit of 7.0 times the Standard Model prediction is placed on the signal strength, for a Higgs boson mass of 125.5 \\GeV.

Coniavitis, E; The ATLAS collaboration

2014-01-01T23:59:59.000Z

85

Searches for Lepton Flavor Violation in the Decays tau+- ---> e+- gamma and tau+- ---> mu+- gamma  

SciTech Connect (OSTI)

Searches for lepton-flavor-violating decays of a {tau} lepton to a lighter mass lepton and a photon have been performed with the entire dataset of (963 {+-} 7) x 10{sup 6} {tau} decays collected by the BABAR detector near the {Upsilon}(4S), {Upsilon}(3S) and {Upsilon}(2S) resonances. The searches yield no evidence of signals and they set upper limits on the branching fractions of {Beta}({tau}{sup {+-}} {yields} e{sup {+-}}{gamma}) < 3.3 x 10{sup -8} and {Beta}({tau}{sup {+-}} {yields} {mu}{sup {+-}}{gamma}) < 4.4 x 10{sup -8} at 90% confidence level.

Aubert, Bernard; Karyotakis, Y.; Lees, J.P.; Poireau, V.; Prencipe, E.; Prudent, X.; Tisserand, V.; /Annecy, LAPP; Garra Tico, J.; Grauges, E.; /Barcelona U., ECM; Martinelli, M.; Palano, A.; Pappagallo, M.; /INFN, Bari /Bari U.; Eigen, G.; Stugu, B.; Sun, L.; /Bergen U.; Battaglia, M.; Brown, David Nathan; Hooberman, B.; Kerth, L.T.; Kolomensky, Yu.G.; Lynch, G.; /LBL, Berkeley /UC, Berkeley /Birmingham U. /Ruhr U., Bochum /British Columbia U. /Brunel U. /Novosibirsk, IYF /UC, Irvine /UC, Riverside /UC, San Diego /UC, Santa Barbara /UC, Santa Cruz /Caltech /Cincinnati U. /Colorado U. /Colorado State U. /Dortmund U. /Dresden, Tech. U. /Ecole Polytechnique /Edinburgh U. /INFN, Ferrara /Ferrara U. /INFN, Ferrara /INFN, Ferrara /Ferrara U. /INFN, Ferrara /INFN, Ferrara /Ferrara U. /Frascati /INFN, Genoa /Genoa U. /INFN, Genoa /INFN, Genoa /Genoa U. /INFN, Genoa /INFN, Genoa /Genoa U. /Harvard U. /Heidelberg U. /Humboldt U., Berlin /Imperial Coll., London /Iowa U. /Iowa State U. /Johns Hopkins U. /Orsay, LAL /LLNL, Livermore /Liverpool U. /Queen Mary, U. of London /Royal Holloway, U. of London /Louisville U. /Mainz U., Inst. Kernphys. /Manchester U. /Maryland U. /Massachusetts U., Amherst /MIT, LNS; /more authors.; ,

2010-06-11T23:59:59.000Z

86

REVIEW OF HEAVY LEPTON PRODUCTION IN e+e- ANNIHILATION* Martin L. Per1  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

HEAVY LEPTON PRODUCTION IN e+e- ANNIHILATION* HEAVY LEPTON PRODUCTION IN e+e- ANNIHILATION* Martin L. Per1 Stanford Linear Accelerator Center Stanford University, Stanford, California 94305 ABSTRACT * The existing data on e f p r , eixT, p xi:, and related events produced in e'e- annihilation are reviewed. All data are consistent with the exist- ence of a new charged lepton, T *, of m a s s 1.9 * . 1 GeV/c2. (Invited talk presented at the 1977 International Symposium on Lepton and Photon Interactions at High Energies, Hambrug, Cfirmany, August 25-31 , 1977.) *Work supported by the Department of Energy. NOTICE-- rpon.wred by the United States Government. Netther the United States nor the United States Department of Energy, nor any of their employees, nor any of their contractors, Subcontractors, or thou employees. makes

87

Energy losses of high-energy muons and ?-leptons in inelastic scattering by nuclei  

Science Journals Connector (OSTI)

A hybrid model is used to calculate the losses of muons and ?-leptons in inelastic scattering by...0...-boson. In the calculations, nuclear effects, such as shading and antiscreening of nucleons, the EMC effect, ...

K. S. Lokhtin; S. I. Sinegovskii

2006-03-01T23:59:59.000Z

88

Search for neutral MSSM Higgs bosons decaying to a pair of tau leptons in pp collisions  

E-Print Network [OSTI]

A search for neutral Higgs bosons in the minimal supersymmetric extension of the standard model (MSSM) decaying to tau-lepton pairs in pp collisions is performed, using events recorded by the CMS experiment at the LHC. The ...

CMS Collaboration

89

Production cross section and topological decay branching fractions of the ? lepton  

E-Print Network [OSTI]

We report new measurements of the production cross section for the reaction e(+)e(?)??(+)?(?) at s?=29 GeV, as well as the topological decay branching fractions of the ? lepton. The data were taken with the High Resolution ...

Baringer, Philip S.

1989-08-01T23:59:59.000Z

90

Lepton Flavor Violation in tau and B decays at BaBar  

SciTech Connect (OSTI)

This article summarizes the search for lepton flavor violating {tau} and B decays, using data collected by the BABAR detector at the PEP-II asymmetric-energy B factory.

Manoni, Elisa; /Perugia U. /INFN, Perugia

2008-07-11T23:59:59.000Z

91

The Inclusive Semileptonic Decay Lepton Spectrum from $B \\to X e \\overline?$  

E-Print Network [OSTI]

In this talk, we review the QCD calculation of the lepton spectrum from inclusive semileptonic $B$ decay. We compare this prediction to that of the ACCMM model. This latter work was done in collaboration with Csaba Csaki.

Lisa Randall

1994-07-15T23:59:59.000Z

92

Unified Explanation of Quark and Lepton Masses and Mixings in the Supersymmetric SO(10) Model  

E-Print Network [OSTI]

We discussed neutrino masses and mixings in SUSY SO(10) model where quarks and leptons have Yukawa couplings to at least two 10 and one $\\bar{126}$ Higgs scalars. In this model, the Dirac and the right-handed Majorana mass terms are expressed by linear combinations of quark and charged lepton mass matrices, which then determine the neutrino mass matrix by the see-saw mechanism. We show that there are various solutions to reproduce a large mixing angle for $\

Kin-ya Oda; Eiichi Takasugi; Minoru Tanaka; Masaki Yoshimura

1998-08-06T23:59:59.000Z

93

Almost Maximal Lepton Mixing with Large T Violation in Neutrino Oscillations and Neutrinoless Double Beta Decay  

E-Print Network [OSTI]

We point out two simple but instructive possibilities to construct the charged lepton and neutrino mass matrices, from which the nearly bi-maximal neutrino mixing with large T violation can naturally emerge. The two lepton mixing scenarios are compatible very well with current experimental data on solar and atmospheric neutrino oscillations, and one of them may lead to an observable T-violating asymmetry between \

Zhi-zhong Xing

2001-07-02T23:59:59.000Z

94

Prospects for Searching for Excited Leptons during RunII of the Fermilab Tevatron  

E-Print Network [OSTI]

This letter presents a study of prospects of searching for excited leptons during RunII of the Fermilab Tevatron. We concentrate on single and pair production of excited electrons in the photonic decay channel in one CDF/DO detector equivalent for 2 fb^{-1}. By the end of RunIIa, the limits should be easily extended beyond those set by LEP and HERA for excited leptons with mass above about 190 GeV.

E. Boos; A. Vologdin; D. Toback; J. Gaspard

2001-11-05T23:59:59.000Z

95

On the possibility of observable signatures of leptonic onium atoms from astrophysical sources  

E-Print Network [OSTI]

The formation of Ps in our Galaxy is well measured, and has led to important and unanswered questions on the origin of the positrons. In principle it should be possible to form analogous systems from mu and tau leptons, viz. true muonium and true tauonium. However the probability of formation for these systems is greatly reduced due to the intrinsically short lifetimes of the mu and tau leptons. Likewise, the decay of the atoms is hastened by the high probability of the constituent particles decaying. Nevertheless, if significant numbers of mu and tau pairs are produced in high energy astrophysical environments there may be significant production of true muonium and true tauonium, despite the small probabilities. This paper addresses this possibility. We have calculated the pair production spectra of mu and tau leptons from photon-photon annihilation and electron-positron annihilation in astrophysical environments. We have computed the cross-sections for radiative recombination and direct annihilation of the ...

Ellis, S C

2015-01-01T23:59:59.000Z

96

Search for anomalous production of multiple leptons in association with $W$ and $Z$ bosons at CDF  

SciTech Connect (OSTI)

This paper presents a search for anomalous production of multiple low-energy leptons in association with a W or Z boson using events collected at the CDF experiment corresponding to 5.1 fb{sup -1} of integrated luminosity. This search is sensitive to a wide range of topologies with low-momentum leptons, including those with the leptons near one another. The observed rates of production of additional electrons and muons are compared with the standard model predictions. No indications of phenomena beyond the standard model are found. A 95% confidence level limit is presented on the production cross section for a benchmark model of supersymmetric hidden-valley Higgs production. Particle identification efficiencies are also provided to enable the calculation of limits on additional models.

Aaltonen, T.; /Helsinki Inst. of Phys.; Alvarez Gonzalez, B.; /Oviedo U. /Cantabria Inst. of Phys.; Amerio, S.; /INFN, Padua; Amidei, D.; /Michigan U.; Anastassov, A.; /Northwestern U. /Fermilab; Annovi, A.; /Frascati; Antos, J.; /Comenius U.; Apollinari, G.; /Fermilab; Appel, J.A.; /Fermilab; Arisawa, T.; /Waseda U.; Artikov, A.; /Dubna, JINR /Texas A-M

2012-02-01T23:59:59.000Z

97

Probing Supersymmetric Model with Heavy Sfermions Using Leptonic Flavor and CP Violations  

E-Print Network [OSTI]

We study leptonic flavor and CP violating observables in supersymmetric (SUSY) models with heavy sfermions, which is motivated by the recent results of the LHC experiments (i.e., the discovery of the Higgs-like boson with the mass of about 126 GeV and the negative searches for the superparticles). Even if the sfermion masses are of O(10-100 TeV), signals may be within the reach of future leptonic flavor- and CP-violation experiments assuming that the off-diagonal elements of the sfermion mass matrices are unsuppressed compared to the diagonal ones. We also consider the SUSY contribution to the K0-K0bar mixing paraemters; we show that the leptonic observables can become as powerful as those in K0-K0bar mixing to constrain SUSY models.

Takeo Moroi; Minoru Nagai

2013-03-04T23:59:59.000Z

98

On the lepton-nucleon neutral and charged current deep inelastic scattering cross sections  

E-Print Network [OSTI]

Based on the requirement in the simulation of lepton-nucleus deep inelastic scattering (DIS), we construct a fortran program LDCS 1.0 calculating the differential and total cross sections for the unpolarized charged lepton-unpolarized nucleon and neutrino-unpolarized nucleon neutral current (charged current) DIS at leading order. Any set of the experimentally fitted parton distribution functions could be employed directly. The mass of incident and scattered leptons is taken into account and the boundary conditions calculating the single differential and total cross section are studied. The calculated results well agree with the corresponding experimental data which indicating the LDCS 1.0 program is good. It is also turned out that the effect of tauon mass is not negligible in the GeV energy level.

Xing-Long Li; Yu-Liang Yan; Xiao-Mei Li; Dai-Mei Zhou; Xu Cai; Ben-Hao Sa

2014-12-17T23:59:59.000Z

99

Spin Asymmetries Arising In Neutrino-Lepton Processes In A Magnetic Field And Their Macroscopic Appearance  

SciTech Connect (OSTI)

We present expressions that determine the differential cross sections and energy and momentum losses for the neutrino-lepton processes {nu}le- {yields} {nu}le-, {nu}-tildele- {yields} {nu}-tildele-, {nu}l{nu}-tildel {yields} e-e+, {nu}l{nu}-tildee {yields} l-e+, {nu}le- {yields} {nu}el- in a magnetic field with allowance for the longitudinal and transverse polarizations of the charged leptons and antileptons and the results on the spin asymmetries arising in these processes.

Huseynov, Vali A. [Department of General and Theoretical Physics, Nakhchivan State University, AZ 7000, Nakhchivan (Azerbaijan); Laboratory of Physical Research, Nakhchivan Division of Azerbaijan National Academy of Sciences, AZ 7000, Nakhchivan (Azerbaijan); Gasimova, Rasmiyya E.; Akbarova, Nurida Y.; Hajiyeva, Billura T. [Department of General and Theoretical Physics, Nakhchivan State University, AZ 7000, Nakhchivan (Azerbaijan)

2007-06-13T23:59:59.000Z

100

Measurement of the top quark mass in lepton+jets events with secondary vertex tagging  

SciTech Connect (OSTI)

A measurement of the top quark mass with the matrix element method in the lepton + jets final state in D0 Run II is presented. Events with single isolated energetic charged lepton (electron or muon), exactly four calorimeter jets, and significant missing transverse energy are selected. Probabilities used to discriminate between signal and background are assumed to be proportional to differential cross-sections, calculated using event kinematics and folding in object resolutions and parton distribution functions. The event likelihoods constructed using these probabilities are varied with the top quark mass, m{sub t}, and the jet energy scale, JES, to give the smallest possible combined statistical + JES uncertainty.

Harrington, Robert Duane; /Northeastern U.

2007-02-01T23:59:59.000Z

Note: This page contains sample records for the topic "leptons leptons leptons" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


101

Intro Selection Results H1/Zeus Conclusions Events with an isolated lepton and missing  

E-Print Network [OSTI]

(-1st CAL ring) > 9 GeV PX T > 9 GeV (µ only) iso > 0.5 in {, } lepton CAL iso: E 60 80 100 120 -2 10 -1 10 1 10 2 10 0 10 20 30 40 50 60 70 80 90 100 -2 10 -1 10 1 10 2 10 (GeV)X TP (GeV)TP Events 20 30 40 50 60 70 80 -2 10 -1 10 1 10 2 10 Events with an isolated lepton and missing

102

Search for Neutral Heavy Leptons in the NuTeV Experiment at Fermilab  

E-Print Network [OSTI]

Preliminary results from a search for neutral heavy leptons in the NuTeV experiment at Fermilab. The upgraded NuTeV neutrino detector for the 1996-1997 run included an instrumented decay region for the NHL search which, combined with the NuTeV calorimeter, allows detection in several decay modes (mu-mu-nu, mu-e-nu, mu-pi, e-pi, and e-e-nu). We see no evidence for neutral heavy leptons in our current search in the mass range from 0.3 GeV to 2.0 GeV decaying into final states containing a muon.

NuTeV Collaboration; R. B. Drucker

1998-11-23T23:59:59.000Z

103

The electron and neutron EDM in the 3-3-1 model with heavy leptons  

E-Print Network [OSTI]

We calculate the electric dipole moment for the electron and neutron in the framework of the 3-3-1 model with heavy charged leptons. We assume that the only source of CP violation arise from a complex trilinear coupling constant and the three VEVs complex. Only one physical phase survives.

G. De Conto; V. Pleitez

2014-08-27T23:59:59.000Z

104

NEUTRON IZATI ON, LEPTON ESCAPE,AND STELLAR HYDRODYNAMICS* W. David Arnett  

E-Print Network [OSTI]

NEUTRON IZATI ON, LEPTON ESCAPE,AND STELLAR HYDRODYNAMICS* W. David Arnett Enrico Fermi Institute University of Chicago 1. The Process of Neutronization.-Aftersili- con burning stellar matter has roughly equal numbers of neutrons and protons. Because neutron-star matter has a large excess of neutrons

Boyer, Edmond

105

K->e nu decays and lepton flavor violation searches with Kaons  

E-Print Network [OSTI]

Recent Kaon decay studies seeking lepton-flavor violating (LFV) new-physics effects are briefly discussed. The main focus is set on precise measurements of rare or not-so-rare decays aiming at finding evidence of deviations from the SM prediction rather than on the results from direct searches of LFV transitions forbidden or ultra-rare in the SM.

T. Spadaro

2009-06-01T23:59:59.000Z

106

Baryon and lepton number violation in the Weinberg-Salam theory  

SciTech Connect (OSTI)

This report discusses the concept of baryon and lepton number violation in the Weinberg-Salam theory. The topics discussed are: periodic vacua in quantum mechanics; tunnelling at finite temperature and classical thermal activation; calculation of the rate; an O(3) nonlinear sigma model; and the transition rate in the O(3) model. (LSP)

Mottola, E.

1989-01-01T23:59:59.000Z

107

Novel inclusive search for the Higgs boson in the four-lepton final state at CDF  

E-Print Network [OSTI]

An inclusive search for the standard model Higgs boson using the four-lepton final state in proton-antiproton collisions produced by the Tevatron at ?s=1.96??TeV is conducted. The data are recorded by the CDF II detector ...

Gomez-Ceballos, Guillelmo

108

Universal Lepton Asymmetry: New Constraints from the Cosmic Microwave Background and Primordial Nucleosynthesis  

E-Print Network [OSTI]

We study the primordial nucleosynthesis and cosmic age in the presence of a net lepton asymmetry as well as baryon asymmetry. We explore a previously unnoted region of the parameter space in which very large baryon densities $0.1 \\le \\Omega_b \\le 1$ can be accommodated within the light-element constraints from primordial nucleosynthesis. This parameter space consists of $\

T. Kajino; M. Orito; G. J. Mathews; R. N. Boyd

2002-02-06T23:59:59.000Z

109

Measurement of the Top Quark Mass Simultaneously in Dilepton and Lepton + Jets Decay Channels  

SciTech Connect (OSTI)

The authors present the first measurement of the top quark mass using simultaneously data from two decay channels. They use a data sample of {radical}s = 1.96 TeV collisions with integrated luminosity of 1.9 fb{sup -1} collected by the CDF II detector. They select dilepton and lepton + jets channel decays of t{bar t} pairs and reconstruct two observables in each topology. They use non-parametric techniques to derive probability density functions from simulated signal and background samples. The observables are the reconstructed top quark mass and the scalar sum of transverse energy of the event in the dilepton topology and the reconstructed top quark mass and the invariant mass of jets from the W boson decay in lepton + jets channel. They perform a simultaneous fit for the top quark mass and the jet energy scale which is constrained in situ by the hadronic W boson resonance from the lepton + jets channel. Using 144 dilepton candidate events and 332 lepton + jets candidate events they measure: M{sub top} = 171.9 {+-} 1.7 (stat. + JES) {+-} 1.1 (other sys.) GeV/c{sup 2} = 171.9 {+-} 2.0 GeV/c{sup 2}. The measurement features a robust treatment of the systematic uncertainties, correlated between the two channels and develops techniques for a future top quark mass measurement simultaneously in all decay channels. Measurements of the W boson mass and the top quark mass provide a constraint on the mass of the yet unobserved Higgs boson. The Higgs boson mass implied by measurement presented here is higher than Higgs boson mass implied by previously published, most precise CDF measurements of the top quark mass in lepton + jets and dilepton channels separately.

Fedorko, Wojciech T.; /Chicago U.

2008-09-01T23:59:59.000Z

110

Single Anomalous Production of the Fourth SM Family Leptons at Future e+e-, ep and pp Colliders  

SciTech Connect (OSTI)

Possible single productions of fourth SM family charged and neutral leptons via anomalous interactions at the future e+e-, ep, and pp colliders are studied. Signatures of such anomalous processes are argued at above colliders comparatively.

Ciftci, A. K. [Physics Department, Faculty of Sciences, Ankara University, 06100 Tandogan, Ankara (Turkey); Ciftci, R.; Karadeniz, H. [Physics Department, Faculty of Sciences and Arts, Gazi University, 06500 Teknikokullar, Ankara (Turkey); Sultansoy, S. [Physics Department, Faculty of Sciences and Arts, Gazi University, 06500 Teknikokullar, Ankara (Turkey); Institute of Physics, Academy of Sciences, H. Cavid Avenue 33, Baku (Azerbaijan); Yildiz, H. Duran [Physics Department, Faculty of Sciences and Arts, Dumlupinar University, Merkez Campus, Kutahya (Turkey)

2007-04-23T23:59:59.000Z

111

Electric dipole moments of charged leptons in the split fermion scenario in the two Higgs doublet model  

E-Print Network [OSTI]

We predict the charged lepton electric dipole moments in the split fermion scenario in the framework of the two Higgs doublet model. We observe that the numerical value of the muon (tau) electric dipole moment is at the order of the magnitude of $10^{-22} (e-cm)$ ($10^{-20} (e-cm)$) and there is an enhancement in the case of two extra dimensions, especially for the tau lepton electric dipole moment.

E. O. Iltan

2005-09-24T23:59:59.000Z

112

Search for the Higgs boson in lepton, tau and jets final states  

E-Print Network [OSTI]

We present a search for the standard model Higgs boson in final states with an electron or muon and a hadronically decaying tau lepton in association with two or more jets using 9.7 fb^{-1} of Run II Fermilab Tevatron Collider data collected with the D0 detector. The analysis is sensitive to Higgs boson production via gluon fusion, associated vector boson production, and vector boson fusion, followed by the Higgs boson decay to tau lepton pairs or to W boson pairs. The ratios of 95% C.L. upper limits on the cross section times branching ratio to those predicted by the standard model are obtained for orthogonal subsamples that are enriched in either H -> tau tau decays or H -> WW decays, and for the combination of these subsample limits. The observed and expected limit ratios for the combined subsamples at a Higgs boson mass of 125 GeV are 11.3 and 9.0 respectively.

D0 Collaboration

2012-11-29T23:59:59.000Z

113

Search for the Higgs boson in lepton, tau, and jets final states  

SciTech Connect (OSTI)

We present a search for the standard model Higgs boson in final states with an electron or muon and a hadronically decaying tau lepton in association with two or more jets using 9.7 fb?1 of Run II Fermilab Tevatron Collider data collected with the D0 detector. The analysis is sensitive to Higgs boson production via gluon fusion, associated vector boson production, and vector boson fusion, followed by the Higgs boson decay to tau lepton pairs or to W boson pairs. The ratios of 95% C.L. upper limits on the cross section times branching ratio to those predicted by the standard model are obtained for orthogonal subsamples that are enriched in either H ? ? ? decays or H ? WW decays, and for the combination of these subsample limits. The observed and expected limit ratios for the combined subsamples at a Higgs boson mass of 125 GeV are 11.3 and 9.0 respectively.

Abazov, V.M.; et al.

2013-09-01T23:59:59.000Z

114

Search for the standard model Higgs boson in tau lepton pair final states  

E-Print Network [OSTI]

We present a search for the standard model Higgs boson in final states with an electron or muon and a hadronically decaying tau lepton in association with zero, one, or two or more jets using data corresponding to an integrated luminosity of up to 7.3 fb^{-1} collected with the D0 detector at the Fermilab Tevatron collider. The analysis is sensitive to Higgs boson production via gluon gluon fusion, associated vector boson production, and vector boson fusion, and to Higgs boson decays to tau lepton pairs or W boson pairs. Observed (expected) limits are set on the ratio of 95% C.L. upper limits on the cross section times branching ratio, relative to those predicted by the Standard Model, of 14 (22) at a Higgs boson mass of 115 GeV and 7.7 (6.8) at 165 GeV.

D0 Collaboration

2012-05-16T23:59:59.000Z

115

Events with Isolated Leptons and Missing Transverse Momentum and Measurement of W Production at HERA  

E-Print Network [OSTI]

Events with high energy isolated electrons, muons or tau leptons and missing transverse momentum are studied using the full e^\\pm p data sample collected by the H1 experiment at HERA, corresponding to an integrated luminosity of 474 pb^{-1}. Within the Standard Model, events with isolated leptons and missing transverse momentum mainly originate from the production of single W bosons. The total single W boson production cross section is measured as 1.14 \\pm 0.25 (stat.) \\pm 0.14 (sys.) pb, in agreement with the Standard Model expectation. The data are also used to establish limits on the WW\\gamma gauge couplings and for a measurement of the W boson polarisation.

Aaron, F D; Andreev, V; Antunovic, B; Aplin, S; Asmone, A; Astvatsatourov, A; Backovic, S; Baghdasaryan, A; Barrelet, E; Bartel, W; Begzsuren, K; Behnke, O; Belousov, A; Bizot, J C; Boudry, V; Bozovic-Jelisavcic, I; Bracinik, J; Brandt, G; Brinkmann, M; Brisson, V; Bruncko, D; Bunyatyan, A; Buschhorn, G; Bystritskaya, L; Campbell, A J; Cantun Avila, K B; Cassol-Brunner, F; Cerny, K; Cerny, V; Chekelian, V; Cholewa, A; Contreras, J G; Coughlan, J A; Cozzika, G; Cvach, J; Dainton, J B; Daum, K; Deak, M; de Boer, Y; Delcourt, B; Del Degan, M; Delvax, J; De Roeck, A; De Wolf, E A; Diaconu, C; Dodonov, V; Dossanov, A; Dubak, A; Eckerlin, G; Efremenko, V; Egli, S; Eliseev, A; Elsen, E; Essenov, S; Falkiewicz, A; Faulkner, P J W; Favart, L; Fedotov, A; Felst, R; Feltesse, J; Ferencei, J; Fischer, D J; Fleischer, M; Fomenko, A; Gabathuler, E; Gayler, J; Ghazaryan, S; Glazov, A; Glushkov, I; Goerlich, L; Goettlich, M; Gogitidze, N; Gouzevitch, M; Grab, C; Greenshaw, T; Grell, B R; Grindhammer, G; Habib, S; Haidt, D; Hansson, M; Helebrant, C; Henderson, R C W; Hennekemper, E; Henschel, H; Herrera, G; Hildebrandt, M; Hiller, K H; Hoffmann, D; Horisberger, R; Hreus, T; Jacquet, M; Janssen, M E; Janssen, X; Jemanov, V; Jonsson, L; Jung, Andreas Werner; Jung, H; Kapichine, M; Katzy, J; Kenyon, I R; Kiesling, C; Klein, M; Kleinwort, C; Klimkovich, T; Kluge, T; Knutsson, A; Kogler, R; Korbel, V; Kostka, P; Kraemer, M; Krastev, K; Kretzschmar, J; Kropivnitskaya, A; Kruger, K; Kutak, K; Landon, M.P J; Lange, W; Lastovicka-Medin, G; Laycock, P; Lebedev, A; Leibenguth, G; Lendermann, V; Levonian, S; Li, G; Lipka, K; Liptaj, A; List, B; List, J; Loktionova, N; Lopez-Fernandez, R; Lubimov, V; Lytkin, L; Makankine, A; Malinovski, E; Marage, P; Marti, Ll; Martyn, H.-U; Maxfield, S J; Mehta, A; Meier, K; Meyer, A B; Meyer, H; Meyer, H; Meyer, J; Michels, V; Mikocki, S; Milcewicz-Mika, I; Moreau, F; Morozov, A; Morris, J V; Mozer, Matthias Ulrich; Mudrinic, M; Muller, K; Murin, P; Naroska, B; Naumann, Th; Newman, P R; Niebuhr, C; Nikiforov, A; Nowak, G; Nowak, K; Nozicka, M; Olivier, B; Olsson, J E; Osman, S; Ozerov, D; Palichik, V; Panagoulias, I; Pandurovic, M; Papadopoulou, Th; Pascaud, C; Patel, G D; Pejchal, O; Perez, E; Petrukhin, A; Picuric, I; Piec, S; Pitzl, D; Placakyte, R; Polifka, R; Povh, B; Preda, T; Radescu, V; Rahmat, A J; Raicevic, N; Raspiareza, A; Ravdandorj, T; Reimer, P; Rizvi, E; Robmann, P; Roland, B; Roosen, R; Rostovtsev, A; Rotaru, M; Ruiz Tabasco, J E; Rurikova, Z; Rusakov, S; Salek, D; Sankey, D P C; Sauter, M; Sauvan, E; Schmitt, S; Schmitz, C; Schoeffel, L; Schoning, A; Schultz-Coulon, H C; Sefkow, F; Shaw-West, R N; Sheviakov, I; Shtarkov, L N; Shushkevich, S; Sloan, T; Smiljanic, Ivan; Soloviev, Y; Sopicki, P; South, D; Spaskov, V; Specka, Arnd E; Staykova, Z; Steder, M; Stella, B; Stoicea, G; Straumann, U; Sunar, D; Sykora, T; Tchoulakov, V; Thompson, G; Thompson, P D; Toll, T; Tomasz, F; Tran, T H; Traynor, D; Trinh, T N; Truol, P; Tsakov, I; Tseepeldorj, B; Turnau, J; Urban, K; Valkarova, A; Vallee, C; Van Mechelen, P; Vargas Trevino, A; Vazdik, Y; Vinokurova, S; Volchinski, V; Wegener, D; Wissing, Ch; Wunsch, E; Zacek, J; Zalesak, J; Zhang, Z; Zhokin, A; Zimmermann, T; Zohrabyan, H; Zomer, F; 10.1140/epjc/s10052-009-1160-6

2009-01-01T23:59:59.000Z

116

LHC bounds on Lepton Number Violation mediated by doubly and singly-charged scalars  

E-Print Network [OSTI]

The only possible doubly-charged scalar decays into two Standard Model particles are into pairs of same-sign charged leptons, H$^{\\pm\\pm}\\rightarrow {l}^\\pm {l}^\\pm, {l} = e, \\mu, \\tau$, or gauge bosons, H$^{\\pm\\pm}\\rightarrow W^\\pm W^\\pm$; being necessary the observation of both to assert the violation of lepton number. However, present ATLAS and CMS limits on doubly-charged scalar production are obtained under specific assumptions on its branching fractions into dileptons only. Although they can be extended to include decays into dibosons and lepton number violating processes. Moreover, the production rates also depend on the type of electroweak multiplet H$^{\\pm\\pm}$ belongs to. We classify the possible alternatives and provide the Feynman rules and codes for generating the corresponding signals for pair and associated doubly-charged scalar production, including the leading contribution from the $s$-channel exchange of electroweak gauge bosons as well as the vector-boson fusion corrections. Then, using the same analysis criteria as the LHC collaborations we estimate the limits on the H$^{\\pm\\pm}$ mass as a function of the electroweak multiplet it belongs to, and obtain the bounds on the lepton number violating processes $pp\\rightarrow {\\rm H}^{\\pm\\pm}{\\rm H}^{\\mp\\mp} \\rightarrow {\\ell}^\\pm {\\ell}^\\pm W^\\mp W^\\mp$ and $pp\\rightarrow {\\rm H}^{\\pm\\pm}{\\rm H}^{\\mp} \\rightarrow {\\ell}^\\pm {\\ell}^\\pm W^\\mp Z$, $\\ell = e, \\mu$, implied by the ATLAS and CMS doubly-charged scalar searches.

Francisco del Aguila; Mikael Chala

2013-11-06T23:59:59.000Z

117

The physics of kaon decays: CP violation and lepton flavor nonconservation  

SciTech Connect (OSTI)

OAK B188 The physics of kaon decays: CP violation and lepton flavor nonconservation. We discuss here the research that is likely to be done in the 1990's in the study of kaon decays. We concentrate on searches for direct CP violation and for the violation of electron- and muon-number, including approved and proposed experiments at existing facilities, and those which could be done at a facility using the proposed Fermilab Main Injector.

William R. Molzon; Bruce D. Winstein

1992-04-30T23:59:59.000Z

118

On leptonic decay of a heavy quarkonium with a Higgs-boson emission  

E-Print Network [OSTI]

A leptonic $(\\bar l l)$ decay of a heavy quark-antiquark bound state $T(\\bar QQ)$ with a Higgs-boson $H$ emission is investigated. The applying of the well-known low-energy theorem to meson-Higgs coupling allows one to estimate the probability of the decay $T(\\bar QQ)\\to \\bar ll H$. The only a simple version of the Standard Model extension containing two-Higgs doublet is considered.

G. A. Kozlov

2005-06-27T23:59:59.000Z

119

PoS(EPS-HEP2013)326 Measurement of the ratio of the leptonic widths  

E-Print Network [OSTI]

PoS(EPS-HEP2013)326 Measurement of the ratio of the leptonic widths ee/µµ for the J/ V. M. The European Physical Society Conference on High Energy Physics EPS-HEP2013 18-24 July 2013 Stockholm, Sweden-NonCommercial-ShareAlike Licence. http://pos.sissa.it/ #12;PoS(EPS-HEP2013)326 ee(J/)/µµ (J/) measurement E. M. Baldin 1 2 3 4 5 6

120

Search for Lepton Number Violating Charged Current Processes with Neutrino Beams  

E-Print Network [OSTI]

We propose a new idea to test a class of loop-induced neutrino mass mechanisms by searching for lepton number violating charged current processes with incident of a neutrino beam. The expected rates of these processes are estimated based on some theoretical assumptions. They turn out to be sizable so that detection of such processes could be possible at near detectors in future highly intense neutrino-beam facilities.

Shinya Kanemura; Yoshitaka Kuno; Toshihiko Ota

2012-05-25T23:59:59.000Z

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121

Perturbative and nonperturbative EM lepton pair production in relativistic heavy-ion collisions  

SciTech Connect (OSTI)

In this talk, the authors focus on electromagnetic dilepton production from the QED-vacuum in relativistic heavy-ion collisions. Heavy ions in relativistic motion generate strong time-dependent EM fields with large Fourier components which give rise to sizable pair production. There are several motivations for this study: Lepton pair production by hadronic (Drell-Yan) processes has been widely discussed as a possible signature of the quark-gluon plasma formation. The dominant background will come from electromagnetic sources and could even mask the signals from the plasma phase. Electromagnetically produced lepton pairs also impose severe constraints on the design of relativistic heavy-ion colliders such as RHIC and LHC. In addition to the free pair production discussed above, pair-production with capture of the negatively charged lepton into a bound state is also possible. This change of the charge state of the ions is the leading mechanism for beam loss of relativistic colliders. Accurate predictions of the cross section for this process are important because the cross section increases with energy.

Oberacker, V.E.; Wells, J.C.; Umar, A.S. [Oak Ridge National Lab., TN (United States)]|[Vanderbilt Univ., Nashville, TN (United States). Dept. of Physics and Astronomy; Strayer, M.R. [Oak Ridge National Lab., TN (United States)

1993-12-31T23:59:59.000Z

122

Measurement of the top quark mass in final states with two leptons  

Science Journals Connector (OSTI)

We present measurements of the top quark mass (mt) in tt candidate events with two final state leptons using 1??fb-1 of data collected by the D0 experiment. Our data sample is selected by requiring two fully identified leptons or by relaxing one lepton requirement to an isolated track if at least one jet is tagged as a b jet. The top quark mass is extracted after reconstructing the event kinematics under the tt hypothesis using two methods. In the first method, we integrate over expected neutrino rapidity distributions, and in the second we calculate a weight for the possible top quark masses based on the observed particle momenta and the known parton distribution functions. We analyze 83 candidate events in the data and obtain mt=176.24.8(stat)2.1(sys)??GeV and mt=173.24.9(stat)2.0(sys)??GeV for the two methods, respectively. Accounting for correlations between the two methods, we combine the measurements to obtain mt=174.74.4(stat)2.0(sys)??GeV.

V. M. Abazov et al. (The D0 Collaboration)

2009-11-20T23:59:59.000Z

123

Evidence for the Higgs-boson Yukawa coupling to tau leptons with the ATLAS detector  

E-Print Network [OSTI]

Results of a search for $H \\to \\tau \\tau$ decays are presented, based on the full set of proton--proton collision data recorded by the ATLAS experiment at the LHC during 2011 and 2012. The data correspond to integrated luminosities of 4.5 $\\rm{fb}^{-1}$ and 20.3 $\\rm{fb}^{-1}$ at centre-of-mass energies of $\\sqrt{s}$ = 7 TeV and $\\sqrt{s}$ = 8 TeV respectively. All combinations of leptonic ($\\tau \\to \\ell \

Aad, Georges; ATLAS Collaboration; Abdallah, Jalal; Abdel Khalek, Samah; Abdinov, Ovsat; Aben, Rosemarie; Abi, Babak; Abolins, Maris; AbouZeid, Ossama; Abramowicz, Halina; Abreu, Henso; Abreu, Ricardo; Abulaiti, Yiming; Acharya, Bobby Samir; Adamczyk, Leszek; Adams, David; Adelman, Jahred; Adomeit, Stefanie; Adye, Tim; Agatonovic-Jovin, Tatjana; Aguilar-Saavedra, Juan Antonio; Agustoni, Marco; Ahlen, Steven; Ahmadov, Faig; Aielli, Giulio; Akerstedt, Henrik; kesson, Torsten Paul Ake; Akimoto, Ginga; Akimov, Andrei; Alberghi, Gian Luigi; Albert, Justin; Albrand, Solveig; Alconada Verzini, Maria Josefina; Aleksa, Martin; Aleksandrov, Igor; Alexa, Calin; Alexander, Gideon; Alexandre, Gauthier; Alexopoulos, Theodoros; Alhroob, Muhammad; Alimonti, Gianluca; Alio, Lion; Alison, John; Allbrooke, Benedict; Allison, Lee John; Allport, Phillip; Aloisio, Alberto; Alonso, Alejandro; Alonso, Francisco; Alpigiani, Cristiano; Altheimer, Andrew David; Alvarez Gonzalez, Barbara; ?lvarez Piqueras, Damin; Alviggi, Mariagrazia; Amako, Katsuya; Amaral Coutinho, Yara; Amelung, Christoph; Amidei, Dante; Amor Dos Santos, Susana Patricia; Amorim, Antonio; Amoroso, Simone; Amram, Nir; Amundsen, Glenn; Anastopoulos, Christos; Ancu, Lucian Stefan; Andari, Nansi; Andeen, Timothy; Anders, Christoph Falk; Anders, Gabriel; Anderson, Kelby; Andreazza, Attilio; Andrei, George Victor; Anduaga, Xabier; Angelidakis, Stylianos; Angelozzi, Ivan; Anger, Philipp; Angerami, Aaron; Anghinolfi, Francis; Anisenkov, Alexey; Anjos, Nuno; Annovi, Alberto; Antonelli, Mario; Antonov, Alexey; Antos, Jaroslav; Anulli, Fabio; Aoki, Masato; Aperio Bella, Ludovica; Arabidze, Giorgi; Arai, Yasuo; Araque, Juan Pedro; Arce, Ayana; Arduh, Francisco Anuar; Arguin, Jean-Francois; Argyropoulos, Spyridon; Arik, Metin; Armbruster, Aaron James; Arnaez, Olivier; Arnal, Vanessa; Arnold, Hannah; Arratia, Miguel; Arslan, Ozan; Artamonov, Andrei; Artoni, Giacomo; Asai, Shoji; Asbah, Nedaa; Ashkenazi, Adi; sman, Barbro; Asquith, Lily; Assamagan, Ketevi; Astalos, Robert; Atkinson, Markus; Atlay, Naim Bora; Auerbach, Benjamin; Augsten, Kamil; Aurousseau, Mathieu; Avolio, Giuseppe; Axen, Bradley; Azuelos, Georges; Azuma, Yuya; Baak, Max; Baas, Alessandra; Bacci, Cesare; Bachacou, Henri; Bachas, Konstantinos; Backes, Moritz; Backhaus, Malte; Badescu, Elisabeta; Bagiacchi, Paolo; Bagnaia, Paolo; Bai, Yu; Bain, Travis; Baines, John; Baker, Oliver Keith; Balek, Petr; Balli, Fabrice; Banas, Elzbieta; Banerjee, Swagato; Bannoura, Arwa A E; Bansil, Hardeep Singh; Barak, Liron; Baranov, Sergei; Barberio, Elisabetta Luigia; Barberis, Dario; Barbero, Marlon; Barillari, Teresa; Barisonzi, Marcello; Barklow, Timothy; Barlow, Nick; Barnes, Sarah Louise; Barnett, Bruce; Barnett, Michael; Barnovska, Zuzana; Baroncelli, Antonio; Barone, Gaetano; Barr, Alan; Barreiro, Fernando; Barreiro Guimares da Costa, Joo; Bartoldus, Rainer; Barton, Adam Edward; Bartos, Pavol; Bartsch, Valeria; Bassalat, Ahmed; Basye, Austin; Bates, Richard; Batista, Santiago Juan; Batley, Richard; Battaglia, Marco; Battistin, Michele; Bauer, Florian; Bawa, Harinder Singh; Beacham, James Baker; Beattie, Michael David; Beau, Tristan; Beauchemin, Pierre-Hugues; Beccherle, Roberto; Bechtle, Philip; Beck, Hans Peter; Becker, Anne Kathrin; Becker, Sebastian; Beckingham, Matthew; Becot, Cyril; Beddall, Andrew; Beddall, Ayda; Bedikian, Sourpouhi; Bednyakov, Vadim; Bee, Christopher; Beemster, Lars; Beermann, Thomas; Begel, Michael; Behr, Katharina; Belanger-Champagne, Camille; Bell, Paul; Bell, William; Bella, Gideon; Bellagamba, Lorenzo; Bellerive, Alain; Bellomo, Massimiliano; Belotskiy, Konstantin; Beltramello, Olga; Benary, Odette; Benchekroun, Driss; Bendtz, Katarina; Benekos, Nektarios; Benhammou, Yan; Benhar Noccioli, Eleonora; Benitez Garcia, Jorge-Armando; Benjamin, Douglas; Bensinger, James; Bentvelsen, Stan; Berge, David; Bergeaas Kuutmann, Elin; Berger, Nicolas; Berghaus, Frank; Beringer, Jrg; Bernard, Clare; Bernard, Nathan Rogers; Bernius, Catrin; Bernlochner, Florian Urs; Berry, Tracey; Berta, Peter; Bertella, Claudia; Bertoli, Gabriele; Bertolucci, Federico; Bertsche, Carolyn; Bertsche, David; Besana, Maria Ilaria; Besjes, Geert-Jan; Bessidskaia, Olga; Bessner, Martin Florian; Besson, Nathalie; Betancourt, Christopher; Bethke, Siegfried; Bevan, Adrian John; Bhimji, Wahid; Bianchi, Riccardo-Maria; Bianchini, Louis; Bianco, Michele; Biebel, Otmar; Bieniek, Stephen Paul; Bierwagen, Katharina; Biglietti, Michela; Bilbao De Mendizabal, Javier; Bilokon, Halina; Bindi, Marcello; Binet, Sebastien

2015-01-01T23:59:59.000Z

124

Search for the Lepton Flavor Violation Process $J/?\\to e?$ at BESIII  

E-Print Network [OSTI]

We search for the lepton-flavor-violating decay of the $J/\\psi$ into an electron and a muon using $(225.3\\pm2.8)\\times 10^{6}$ $J/\\psi$ events collected with the BESIII detector at the BEPCII collider. Four candidate events are found in the signal region, consistent with background expectations. An upper limit on the branching fraction of $\\mathcal{B}(J/\\psi \\to e\\mu)< 1.5 \\times 10^{-7}$ (90% C.L.) is obtained.

BESIII Collaboration; M. Ablikim; M. N. Achasov; O. Albayrak; D. J. Ambrose; F. F. An; Q. An; J. Z. Bai; R. Baldini Ferroli; Y. Ban; J. Becker; J. V. Bennett; M. Bertani; J. M. Bian; E. Boger; O. Bondarenko; I. Boyko; R. A. Briere; V. Bytev; H. Cai; X. Cai; O. akir; A. Calcaterra; G. F. Cao; S. A. Cetin; J. F. Chang; G. Chelkov; G. Chen; H. S. Chen; J. C. Chen; M. L. Chen; S. J. Chen; X. Chen; Y. B. Chen; H. P. Cheng; Y. P. Chu; D. Cronin-Hennessy; H. L. Dai; J. P. Dai; D. Dedovich; Z. Y. Deng; A. Denig; I. Denysenko; M. Destefanis; W. M. Ding; Y. Ding; L. Y. Dong; M. Y. Dong; S. X. Du; J. Fang; S. S. Fang; L. Fava; C. Q. Feng; P. Friedel; C. D. Fu; J. L. Fu; Y. Gao; C. Geng; K. Goetzen; W. X. Gong; W. Gradl; M. Greco; M. H. Gu; Y. T. Gu; Y. H. Guan; A. Q. Guo; L. B. Guo; T. Guo; Y. P. Guo; Y. L. Han; F. A. Harris; K. L. He; M. He; Z. Y. He; T. Held; Y. K. Heng; Z. L. Hou; C. Hu; H. M. Hu; J. F. Hu; T. Hu; G. M. Huang; G. S. Huang; J. S. Huang; L. Huang; X. T. Huang; Y. Huang; Y. P. Huang; T. Hussain; C. S. Ji; Q. Ji; Q. P. Ji; X. B. Ji; X. L. Ji; L. L. Jiang; X. S. Jiang; J. B. Jiao; Z. Jiao; D. P. Jin; S. Jin; F. F. Jing; N. Kalantar-Nayestanaki; M. Kavatsyuk; B. Kopf; M. Kornicer; W. Kuehn; W. Lai; J. S. Lange; P. Larin; M. Leyhe; C. H. Li; Cheng Li; Cui Li; D. M. Li; F. Li; G. Li; H. B. Li; J. C. Li; K. Li; Lei Li; Q. J. Li; S. L. Li; W. D. Li; W. G. Li; X. L. Li; X. N. Li; X. Q. Li; X. R. Li; Z. B. Li; H. Liang; Y. F. Liang; Y. T. Liang; G. R. Liao; X. T. Liao; D. Lin; B. J. Liu; C. L. Liu; C. X. Liu; F. H. Liu; Fang Liu; Feng Liu; H. Liu; H. B. Liu; H. H. Liu; H. M. Liu; H. W. Liu; J. P. Liu; K. Liu; K. Y. Liu; Kai Liu; P. L. Liu; Q. Liu; S. B. Liu; X. Liu; Y. B. Liu; Z. A. Liu; Zhiqiang Liu; Zhiqing Liu; H. Loehner; G. R. Lu; H. J. Lu; J. G. Lu; Q. W. Lu; X. R. Lu; Y. P. Lu; C. L. Luo; M. X. Luo; T. Luo; X. L. Luo; M. Lv; C. L. Ma; F. C. Ma; H. L. Ma; Q. M. Ma; S. Ma; T. Ma; X. Y. Ma; F. E. Maas; M. Maggiora; Q. A. Malik; Y. J. Mao; Z. P. Mao; J. G. Messchendorp; J. Min; T. J. Min; R. E. Mitchell; X. H. Mo; H. Moeini; C. Morales Morales; K. Moriya; N. Yu. Muchnoi; H. Muramatsu; Y. Nefedov; C. Nicholson; I. B. Nikolaev; Z. Ning; S. L. Olsen; Q. Ouyang; S. Pacetti; J. W. Park; M. Pelizaeus; H. P. Peng; K. Peters; J. L. Ping; R. G. Ping; R. Poling; E. Prencipe; M. Qi; S. Qian; C. F. Qiao; L. Q. Qin; X. S. Qin; Y. Qin; Z. H. Qin; J. F. Qiu; K. H. Rashid; G. Rong; X. D. Ruan; A. Sarantsev; B. D. Schaefer; M. Shao; C. P. Shen; X. Y. Shen; H. Y. Sheng; M. R. Shepherd; W. M. Song; X. Y. Song; S. Spataro; B. Spruck; D. H. Sun; G. X. Sun; J. F. Sun; S. S. Sun; Y. J. Sun; Y. Z. Sun; Z. J. Sun; Z. T. Sun; C. J. Tang; X. Tang; I. Tapan; E. H. Thorndike; D. Toth; M. Ullrich; I. Uman; G. S. Varner; B. Q. Wang; D. Wang; D. Y. Wang; K. Wang; L. L. Wang; L. S. Wang; M. Wang; P. Wang; P. L. Wang; Q. J. Wang; S. G. Wang; X. F. Wang; X. L. Wang; Y. D. Wang; Y. F. Wang; Y. Q. Wang; Z. Wang; Z. G. Wang; Z. Y. Wang; D. H. Wei; J. B. Wei; P. Weidenkaff; Q. G. Wen; S. P. Wen; M. Werner; U. Wiedner; L. H. Wu; N. Wu; S. X. Wu; W. Wu; Z. Wu; L. G. Xia; Y. X Xia; Z. J. Xiao; Y. G. Xie; Q. L. Xiu; G. F. Xu; G. M. Xu; Q. J. Xu; Q. N. Xu; X. P. Xu; Z. R. Xu; F. Xue; Z. Xue; L. Yan; W. B. Yan; Y. H. Yan; H. X. Yang; Y. Yang; Y. X. Yang; H. Ye; M. Ye; M. H. Ye; B. X. Yu; C. X. Yu; H. W. Yu; J. S. Yu; S. P. Yu; C. Z. Yuan; Y. Yuan; A. A. Zafar; A. Zallo; S. L. Zang; Y. Zeng; B. X. Zhang; B. Y. Zhang; C. Zhang; C. C. Zhang; D. H. Zhang; H. H. Zhang; H. Y. Zhang; J. Q. Zhang; J. W. Zhang; J. Y. Zhang; J. Z. Zhang; LiLi Zhang; R. Zhang; S. H. Zhang; X. J. Zhang; X. Y. Zhang; Y. Zhang; Y. H. Zhang; Z. P. Zhang; Z. Y. Zhang; Zhenghao Zhang; G. Zhao; H. S. Zhao; J. W. Zhao; K. X. Zhao; Lei Zhao; Ling Zhao; M. G. Zhao; Q. Zhao; S. J. Zhao; T. C. Zhao; X. H. Zhao; Y. B. Zhao; Z. G. Zhao; A. Zhemchugov; B. Zheng; J. P. Zheng; Y. H. Zheng; B. Zhong; L. Zhou; X. Zhou; X. K. Zhou; X. R. Zhou; C. Zhu; K. Zhu; K. J. Zhu; S. H. Zhu; X. L. Zhu; Y. C. Zhu; Y. M. Zhu; Y. S. Zhu; Z. A. Zhu; J. Zhuang; B. S. Zou; J. H. Zou

2013-04-11T23:59:59.000Z

125

Dark Matter and Lepton Flavour Violation in a Hybrid Neutrino Mass Model  

E-Print Network [OSTI]

We describe a hybrid model in which the light neutrino mass matrix receives both tree-level seesaw and loop-induced contributions. An additional U(1) gauge symmetry is used to stabilize the lightest right-handed neutrino as the Dark Matter candidate. After fitting the experimental neutrino data, we analyze and correlate the phenomenological consequences of the model, namely its impact on electroweak precision measurements, the Dark Matter relic abundance, lepton flavour violating rare decays and neutrinoless double beta decay. We find that natural realizations of the model characterized by large Yukawa couplings are compatible with and close to the current experimental limits.

Deppisch, Frank F

2014-01-01T23:59:59.000Z

126

Lepton flavor violation in the supersymmetric seesaw model after the LHC 8 TeV run  

E-Print Network [OSTI]

We study the lepton flavor violation in the supersymmetric seesaw model taking into account recent experimental improvements, especially for the Higgs boson mass measurement, direct searches of superpartners and the rare decay of B_s -> mu+ mu- at the LHC, the neutrino mixing angle of theta_{13} at the neutrino experiments, and the search of mu -> e gamma at the MEG experiment. We obtain the latest constraints on the parameters in the supersymmetry breaking terms and study the effect on the lepton flavor violating decays of tau -> mu gamma and mu -> e gamma. In particular, we consider two kinds of assumption on the structures in the Majorana mass matrix and the neutrino Yukawa matrix. In the case of the Majorana mass matrix proportional to the unit matrix, allowing non-vanishing CP violating parameters in the neutrino Yukawa matrix, we find that the branching ratio of tau -> mu gamma can be larger than 10^{-9} within the improved experimental limit of mu -> e gamma. We also consider the neutrino Yukawa matrix that includes the mixing only in the second and third generations, and find that a larger branching ratio of tau -> mu gamma than 10^{-9} is possible with satisfying the recent constraints.

Toru Goto; Yasuhiro Okada; Tetsuo Shindou; Minoru Tanaka; Ryoutaro Watanabe

2014-12-08T23:59:59.000Z

127

Long-baseline neutrino oscillation experiments and CP violation in the lepton sector  

Science Journals Connector (OSTI)

We discuss possibilities to investigate the effects of CP (and T) violation in the lepton sector in neutrino oscillation experiments. We consider the effects of CP violation in the framework of two schemes of mixing of four massive neutrinos that can accommodate the results of all neutrino oscillation experiments. Using the constraints on the mixing parameters that follow from the results of short-baseline neutrino oscillation experiments, we derive rather strong upper bounds on the effects of CP violation in ?(-)???(-)e transitions in long-baseline neutrino oscillation experiments. We show that the effects of CP violation in ?(-)???(-)? transitions in long-baseline oscillation experiments can be as large as is allowed by the unitarity of the mixing matrix. The matter effects, which complicate the problem of searching for CP violation in long-baseline experiments, are discussed in detail. We consider the T-odd asymmetries whose measurement could allow to reveal T and CP violation in the lepton sector independently from matter effects.

S. M. Bilenky; C. Giunti; W. Grimus

1998-06-12T23:59:59.000Z

128

Test of Lepton Universality in Upsilon(1S) Decays at BaBar  

SciTech Connect (OSTI)

The ratio R{sub {tau}{mu}}({Upsilon}(1S))={Lambda}{sub {Upsilon}(1S){yields}{tau}{sup +}{tau}{sup -}}/{Lambda}{sub {Upsilon}(1S){yields}{mu}{sup +}{mu}{sup -}} is measured using a sample of (121.8 {+-} 1.2) x 10{sup 6}{Upsilon}(3S) events recorded by the BABAR detector. This measurement is intended as a test of lepton universality and as a search for a possible light pseudoscalar Higgs boson. In the standard model (SM) this ratio is expected to be close to 1. Any significant deviations would violate lepton universality and could be introduced by the coupling to a light pseudoscalar Higgs boson. The analysis studies the decays {Upsilon}(3S) {yields} {Upsilon}(1S){sub {pi}{sup +}{pi}{sup -}}, {Upsilon}(1S) {yields} {ell}{sup +}{ell}{sup -}, where l = {mu}, {tau}. The result, R{sub {tau}{mu}}({Upsilon}(1S))=1.005 {+-} 0.013(stat) {+-} 0.022(syst), shows no deviation from the expected SM value, while improving the precision with respect to previous measurements.

del Amo Sanchez, P.; Lees, J.P.; Poireau, V.; Prencipe, E.; Tisserand, V.; /Annecy, LAPP; Garra Tico, J.; Grauges, E.; /Barcelona U., ECM; Martinelli, M.; Palano, A.; Pappagallo, M.; /Bari U. /INFN, Bari; Eigen, G.; Stugu, B.; Sun, L.; /Bergen U.; Battaglia, M.; Brown, David Nathan; Hooberman, B.; Kerth, L.T.; Kolomensky, Yu.G.; Lynch, G.; Osipenkov, I.L.; Tanabe, T.; /LBL, Berkeley /UC, Berkeley /Birmingham U. /Ruhr U., Bochum /British Columbia U. /Brunel U. /Novosibirsk, IYF /UC, Irvine /UC, Riverside /UC, San Diego /UC, Santa Barbara /UC, Santa Cruz /Caltech /Cincinnati U. /Colorado U. /Colorado State U. /Dortmund U. /Dresden, Tech. U. /Ecole Polytechnique /Edinburgh U. /Ferrara U. /INFN, Ferrara /Frascati /Columbus Supercond., Genova /INFN, Genoa /Indian Inst. Tech., Guwahati /Harvard U. /Heidelberg U. /Humboldt U., Berlin /Imperial Coll., London /Iowa State U. /Iowa State U. /Johns Hopkins U. /Orsay, LAL /LLNL, Livermore /Liverpool U. /Queen Mary, U. of London /Royal Holloway, U. of London /Louisville U. /Mainz U., Inst. Kernphys. /Manchester U. /Maryland U. /Massachusetts U., Amherst /MIT /McGill U. /Consorzio Milano Ricerche /INFN, Milan /Mississippi U. /Montreal U. /Napoli Seconda U. /INFN, Naples /NIKHEF, Amsterdam /Notre Dame U.; /more authors.; ,

2010-06-07T23:59:59.000Z

129

Neutrino Masses, Lepton Flavor Mixing and Leptogenesis in the Minimal Seesaw Model  

E-Print Network [OSTI]

We present a review of neutrino phenomenology in the minimal seesaw model (MSM), an economical and intriguing extension of the Standard Model with only two heavy right-handed Majorana neutrinos. Given current neutrino oscillation data, the MSM can predict the neutrino mass spectrum and constrain the effective masses of the tritium beta decay and the neutrinoless double-beta decay. We outline five distinct schemes to parameterize the neutrino Yukawa-coupling matrix of the MSM. The lepton flavor mixing and baryogenesis via leptogenesis are investigated in some detail by taking account of possible texture zeros of the Dirac neutrino mass matrix. We derive an upper bound on the CP-violating asymmetry in the decay of the lighter right-handed Majorana neutrino. The effects of the renormalization-group evolution on the neutrino mixing parameters are analyzed, and the correlation between the CP-violating phenomena at low and high energies is highlighted. We show that the observed matter-antimatter asymmetry of the Universe can naturally be interpreted through the resonant leptogenesis mechanism at the TeV scale. The lepton-flavor-violating rare decays, such as $\\mu \\to e + \\gamma$, are also discussed in the supersymmetric extension of the MSM.

Wan-lei Guo; Zhi-zhong Xing; Shun Zhou

2006-12-05T23:59:59.000Z

130

Energy spectrum and angular distribution of muons from the decay of heavy leptons produced in colliding electron-positron beams  

Science Journals Connector (OSTI)

On the basis of an arbitrary (V, A) structure of the neutral weak ee and LL currents (L=??, M0) a study is made of the processes of production in colliding electron-positron beams of pairs of heavy leptons with ...

T. M. Aliev; N. A. Guliev; I. G. Dzhafarov; F. T. Khalil-Zade

1981-02-01T23:59:59.000Z

131

Direct CP Violation of b s and CP Asymmetries of Non-Leptonic B Decays in Squark Flavor Mixing  

Science Journals Connector (OSTI)

......1202.0486 . 13) Bigi See I. I. , Sanda A. I., CP violation (2000) : Cambridge University Press...Theoretical Physics, Vol. 128. No. 2, August 2012 Direct CP Violation of b s and CP Asymmetries of Non-Leptonic B Decays in Squark Flavor......

Yusuke Shimizu; Morimitsu Tanimoto; Kei Yamamoto

2012-08-01T23:59:59.000Z

132

Inclusive lepton production in hadronic events from e/sup +/e/sup -/ annihilation at 29 GeV  

SciTech Connect (OSTI)

We have measured the production rates of prompt electrons and muons in hadronic events from e/sup +/e/sup -/ annihilation at 29 GeV. The inclusive rate per hadronic event for leptons with total momenta greater than 2 GeV/c is determined to be (0.033 +- 0.003 +- 0.012) for electrons and (0.037 +- 0.005 +- 0.008) for muons. We measure the longitudinal and transverse momentum spectra of these leptons. The harder transverse momentum spectrum of leptons from bottom and charm quark relative to charm decays allows us to separate the bottom and charm quark contributions to the prompt lepton signal. The longitudinal momentum distributions allow us to study the fragmentation properties of these heavy quarks. For charm quarks we find average semileptonic branching ratios of (6.4 +- 1.3 +- 2.8)% into electrons and (8.1 +- 1.6 +- 1.8)% into muons. For bottom quarks we find average branching ratios of (12.9 +- 2.5 +- 2.0)% into electrons and (12.2 +- 5.0 +- 3.0)% into muons. The fragmentation function for bottom quarks is determined to be peaked at large z with /sub b/ approx. = 0.75. 46 references.

Nelson, M.E.

1983-10-01T23:59:59.000Z

133

CDF note 10582 Search for SM Higgs boson production in association with tt using no lepton final state  

E-Print Network [OSTI]

CDF note 10582 Search for SM Higgs boson production in association with t¯t using no lepton final is that t¯t decay all hadronic mode (all t decay into bqq ). In both cases we consider that the Higgs boson discriminant variable from different neural network to discriminate the Higgs boson signal from remained

Fermilab

134

PDF uncertainties on the W boson mass measurement from the lepton transverse momentum distribution  

E-Print Network [OSTI]

We study the charged current Drell-Yan process and we evaluate the proton parton densities uncertainties on the lepton transverse momentum distribution and their impact on the determination of the W-boson mass. We consider the global PDF sets CT10, MSTW2008CPdeut, NNPDF2.3, NNPDF3.0, MMHT2014, and apply the PDF4LHC recipe to combine the individual results, obtaining an uncertainty on MW that ranges between +-18 and +-24 MeV, depending on the final state, collider energy and kind. We discuss the dependence of the uncertainty on the acceptance cuts and the role of the individual parton densities in the final result. We remark that some PDF sets predict an uncertainty on MW of O(10 MeV); this encouraging result is spoiled, in the combined analysis of the different sets, by an important spread of the central values predicted by each group.

Bozzi, Giuseppe; Vicini, Alessandro

2015-01-01T23:59:59.000Z

135

SuperLFV: An SLHA tool for lepton flavor violating observables in supersymmetric models  

E-Print Network [OSTI]

We introduce SuperLFV, a numerical tool for calculating low-energy LFV observables in the context of the minimal supersymmetric standard model (MSSM). As the Large Hadron Collider and MEG, a dedicated mu -> e gamma experiment, are presently acquiring data, there is need for tools that provide rapid discrimination of models that exhibit lepton flavor violation (LFV). SuperLFV accepts an SLHA-compliant spectrum file that contains the MSSM couplings and masses with complex phases at the supersymmetry breaking scale. In this manner, SuperLFV is compatible with but divorced from existing SLHA spectrum calculators that provides the low energy spectrum. Hence, input spectra are not confined to the LFV sources provided by established SLHA spectrum calculators. Input spectra may be generated by personal code or by hand, allowing for arbitrary models not supported by existing spectrum calculators.

Murakami, Brandon

2013-01-01T23:59:59.000Z

136

Lepton Flavor Violations in High-Scale SUSY with Right-Handed Neutrinos  

E-Print Network [OSTI]

Motivated by the recent discovery of the Higgs boson at m_h = 126 GeV and also by the non-observation of superparticles at the LHC, high-scale SUSY, where the superparticles are as heavy as O(10) TeV, has been recently proposed. We study lepton-flavor violations (LFVs) in the high-scale SUSY with right-handed neutrinos. Even if the slepton masses are of O(10) TeV, the renormalization group (RG) effects on the slepton mass-squared matrix may induce large enough LFVs which are within the reach of future LFV experiments. We also discuss the implication of the right-handed neutrinos on the electroweak symmetry breaking in such a model, and show that the parameter region with the successful electroweak symmetry breaking is enlarged by the RG effects due to the right-handed neutrinos.

Takeo Moroi; Minoru Nagai; Tsutomu T. Yanagida

2013-05-31T23:59:59.000Z

137

Lepton Universality, |V(Us)| and Search for Second Class Current in Tau Decays  

SciTech Connect (OSTI)

Several hundred million {tau} decays have been studied with the BABAR detector at the PEP-II e{sup +}e{sup -} collider at the SLAC National Accelerator Laboratory. Recent results on Charged Current Lepton Universality and two independent measurements of |V{sub us}| using {tau}{sup -} {yields} e{sup -}{bar {nu}}{sub e}{nu}{sub {tau}}, {mu}{sup -}{bar {nu}}{sub {mu}}{nu}{sub {tau}}, {pi}{sup -}{nu}{sub {tau}}, K{sup -} {nu}{sub {tau}} and K{sub S}{sup 0}{pi}{sup -} {nu}{sub {tau}} decays, and a search for Second Class Current in {tau}{sup -} {yields} {pi}{sup -} {omega}{nu}{sub {tau}} decays are presented, where the charge conjugate decay modes are also implied.

Banerjee, Swagato; /Victoria U.

2011-11-10T23:59:59.000Z

138

Precise measurement of the top-quark mass from lepton+jets events at D0  

SciTech Connect (OSTI)

We report a measurement of the mass of the top quark in lepton+jets final states of pp&3772; ? tt? data corresponding to 2.6 fb-1 of integrated luminosity collected at the D0 experiment at the Fermilab Tevatron Collider. Using a matrix element method, we combine an in situ jet energy calibration with the standard jet energy scale derived in studies of ? + jet and dijet events and employ a novel flavor-dependent jet response correction to measure a top-quark mass of mt = 176.01 1.64 GeV. Combining this result with a previous result obtained on an independent data set, we measure a top-quark mass of mt = 174.94 1.49 GeV for a total integrated luminosity of 3.6 fb-1.

Abazov, Victor Mukhamedovich [Dubna, JINR; Abbott, Braden Keim [Oklahoma U.; Acharya, Bannanje Sripath [Tata Inst.; Adams, Mark Raymond [Illinois U., Chicago; Adams, Todd [Florida State U.; Alexeev, Guennadi D [Dubna, JINR; Alkhazov, Georgiy D [St. Petersburg, INP; Alton, Andrew K [Michigan U.; Augustana Coll., Sioux Falls; Alverson, George O [Northeastern U.; Alves, Gilvan Augusto [Rio de Janeiro, CBPF; Ancu, Lucian Stefan [Nijmegen U.; Fermilab

2011-08-09T23:59:59.000Z

139

Search for Supersymmetry with Tau Leptons in Data from the ATLAS Experiment at the LHC  

E-Print Network [OSTI]

This thesis presents the search for Supersymmetry in events with high pT jets, a large amount of missing transverse energy and at least one hadronically decaying ? lepton in data from the ATLAS detector. Two analyses are presented in detail: one performed on the data collected during the year 2010 and one on the full data set recorded by ATLAS in year 2012. The latter analysis is based on two published papers in which the author of this thesis has been involved. These are Paper I and Paper II attached to this thesis. Paper II is an ATLAS conference note. The final version of the analysis is in an advanced stage of preparation with scheduled submission for publication in early Summer 2014.

Sjursen, Therese Berge; Osland, Per

2014-06-26T23:59:59.000Z

140

Precise measurement of the top-quark mass from lepton+jets events at D0  

DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

We report a measurement of the mass of the top quark in lepton+jets final states of pp&3772; ? tt? data corresponding to 2.6 fb-1 of integrated luminosity collected at the D0 experiment at the Fermilab Tevatron Collider. Using a matrix element method, we combine an in situ jet energy calibration with the standard jet energy scale derived in studies of ? + jet and dijet events and employ a novel flavor-dependent jet response correction to measure a top-quark mass of mt = 176.01 1.64 GeV. Combining this result with a previous result obtained on an independent data set, we measure a top-quark mass of mt = 174.94 1.49 GeV for a total integrated luminosity of 3.6 fb-1.

Abazov, Victor Mukhamedovich [Dubna, JINR; Abbott, Braden Keim [Oklahoma U.; Acharya, Bannanje Sripath [Tata Inst.; Adams, Mark Raymond [Illinois U., Chicago; Adams, Todd [Florida State U.; Alexeev, Guennadi D [Dubna, JINR; Alkhazov, Georgiy D [St. Petersburg, INP; Alton, Andrew K [Michigan U.; Augustana Coll., Sioux Falls; Alverson, George O [Northeastern U.; Alves, Gilvan Augusto [Rio de Janeiro, CBPF; Ancu, Lucian Stefan [Nijmegen U.; Fermilab

2011-08-09T23:59:59.000Z

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141

Electroweak corrections to lepton pair production in association with two hard jets at the LHC  

E-Print Network [OSTI]

We compute the next-to-leading order corrections of $O(\\alpha_s^2\\alpha^3)$ to the hadronic production of two oppositely charged leptons and two hard jets, $p p \\to j j l^- l^+$, using Recola and Collier. We include electroweak and QCD corrections at the given order and all off-shell effects. We provide detailed predictions for the LHC operating at 13 TeV and obtain per-cent-level corrections for the total cross section. For differential distributions we find significant non-uniform distortions in high-energy tails at the level of several ten per cent due to electroweak Sudakov logarithms and deformations at the level of a few per cent for angular variables.

Ansgar Denner; Lars Hofer; Andreas Scharf; Sandro Uccirati

2014-11-04T23:59:59.000Z

142

Precise measurement of the top quark mass in the lepton+jets topology at CDF II  

SciTech Connect (OSTI)

The authors present a measurement of the mass of the top quark from proton-antiproton collisions recorded at the CDF experiment in Run II of the Fermilab Tevatron. They analyze events from the single lepton plus jets final state (t{bar t} {yields} W{sup +}bW{sup -}{bar b} {yields} lvbq{bar q}{bar b}). The top quark mass is extracted using a direct calculation of the probability density that each event corresponds to the t{bar t} final state. The probability is a function of both the mass of the top quark and the energy scale of the calorimeter jets, which is constrained in situ by the hadronic W boson mass. Using 167 events observed in 955 pb{sup -1} of integrated luminosity, they achieve the single most precise measurement of the top quark mass, 170.8 {+-} 2.2(stat.) {+-} 1.4(syst.) GeV/c{sup 2}.

Abulencia, A.; /Illinois U., Urbana; Adelman, J.; /Chicago U.; Affolder, T.; /UC, Santa Barbara; Akimoto, T.; /Tsukuba U.; Albrow, M.G.; /Fermilab; Amerio, S.; /Padua U.; Amidei, D.; /Michigan U.; Anastassov, A.; /Rutgers U., Piscataway; Anikeev, K.; /Fermilab; Annovi, A.; /Frascati; Antos, J.; /Comenius U. /Tsukuba U.

2007-03-01T23:59:59.000Z

143

Physics Beyond the Standard Model: Exotic Leptons and Black Holes at Future Colliders  

E-Print Network [OSTI]

The Standard Model of particle physics has been remarkably successful in describing present experimental results. However, it is assumed to be only a low-energy effective theory which will break down at higher energy scales, theoretically motivated to be around 1 TeV. There are a variety of proposed models of new physics beyond the Standard Model, most notably supersymmetric and extra dimension models. New charged and neutral heavy leptons are a feature of a number of theories of new physics, including the `intermediate scale' class of supersymmetric models. Using a time-of-flight technique to detect the charged leptons at the Large Hadron Collider, the discovery range (in the particular scenario studied in the first part of this thesis) is found to extend up to masses of 950 GeV. Extra dimension models, particularly those with large extra dimensions, allow the possible experimental production of black holes. The remainder of the thesis describes some theoretical results and computational tools necessary to model the production and decay of these miniature black holes at future particle colliders. The grey-body factors which describe the Hawking radiation emitted by higher-dimensional black holes are calculated numerically for the first time and then incorporated in a Monte Carlo black hole event generator; this can be used to model black hole production and decay at next-generation colliders. It is hoped that this generator will allow more detailed examination of black hole signatures and help to devise a method for extracting the number of extra dimensions present in nature.

Christopher M. Harris

2005-02-01T23:59:59.000Z

144

Calculable lepton masses, seesaw relations and four neutrino mixings in a 3-3-1 model with extra U(1) symmetry  

E-Print Network [OSTI]

We propose a scheme in that the masses of the heavier leptons obey seesaw type relations. The light lepton masses, except the electron and the electron neutrino ones are generated by one loop level radiative corrections. We work in a version of the 3-3-1 electroweak model that predicts singlets (charged and neutral) of heavy leptons beyond the known ones. An extra U(1)_Omega symmetry is introduced in order to avoid the light leptons get masses at the tree level. The electron mass induces an explicit symmetry breaking at U(1). We discuss also the mixing matrix among four neutrinos. The new energy scale required is not higher than a few TeV.

Nelson V. Cortez; Mauro D. Tonasse

2005-10-11T23:59:59.000Z

145

Search for Supersymmetry in Events with Three Leptons and Missing Transverse Momentum in ?s=7??TeV pp Collisions with the ATLAS Detector  

E-Print Network [OSTI]

A search for the weak production of charginos and neutralinos decaying to a final state with three leptons (electrons or muons) and missing transverse momentum is presented. The analysis uses 2.06??fb[superscript -1] of ...

Taylor, Frank E.

146

Search for the Lepton-Flavor-Violating Decays B[0 over s] ? e[superscript ]?[superscript ?] and B[superscript 0] ? e[superscript ]?[superscript ?  

E-Print Network [OSTI]

A search for the lepton-flavor-violating decays B[0 over s] ? e[superscript ]?[superscript ?] and B[superscript 0] ? e[superscript ]?[superscript ?] is performed with a data sample, corresponding to an integrated luminosity ...

Williams, Michael

147

Measurement of the t[bar over t] production cross section in pp collisions at ?s = 8 TeV in dilepton final states containing one ? lepton  

E-Print Network [OSTI]

The top-quark pair production cross section is measured in final states with one electron or muon and one hadronically decaying ? lepton from the process t[bar over t] ? (??[subscript ?])(??[subscript ?])b[bar over b], ...

Zhukova, Victoria

148

Search for massive resonances decaying into pairs of boosted bosons in semi-leptonic final states at s $$ \\sqrt{s} $$ = 8 TeV  

E-Print Network [OSTI]

A search for new resonances decaying to WW, ZZ, or WZ is presented. Final states are considered in which one of the vector bosons decays leptonically and the other hadronically. Results are based on data corresponding to ...

Apyan, Aram

149

Top physics: measurement of the cross section for ttbar production in ppbar collisions using the kinematics of lepton + jets events  

SciTech Connect (OSTI)

We present a measurement of the top pair production cross section in p{bar p} collisions at {radical}s = 1.96 TeV. We collect a data sample with an integrated luminosity of 194 {+-} 11 pb{sup -1} with the CDF II detector at the Fermilab Tevatron. We use an artificial neural network technique to discriminate between top pair production and background processes in a sample of 519 lepton+jets events, which have one isolated energetic charged lepton, large missing transverse energy and at least three energetic jets. We measure the top pair production cross section to be {sigma}{sub t{bar t}} = 6.6 {+-} 1.1 {+-} 1.5 pb, where the first uncertainty is statistical and the second is systematic.

Acosta, D.; The CDF Collaboration

2005-04-27T23:59:59.000Z

150

Higgs boson exempt no-scale supersymmetry with a neutrino seesaw mechanism: Implications for lepton flavor violation and leptogenesis  

SciTech Connect (OSTI)

Motivated by the observation of neutrino oscillations, we extend the Higgs boson exempt no-scale supersymmetry model by adding three heavy right-handed neutrino chiral supermultiplets to generate the light neutrino masses and mixings. The neutrino Yukawa couplings can induce new lepton-flavor violating couplings among the soft terms in the course of renormalization group running down from the boundary scale. We study the effects this has on the predictions for low-energy probes of lepton-flavor violation (LFV). Heavy right-handed neutrinos also provide a way to generate the baryon asymmetry through leptogenesis. We find that consistency with LFV and leptogenesis puts strong requirements on either the form of the Yukawa mass matrix or the smallness of the Higgs up soft mass. In all cases, we generically expect that new physics LFV is nonzero and can be found in a future experiment.

Chun, Eung Jin [Korean Institute for Advanced Study (KIAS), Hoegiro 87, Dongdaemun-gu Seoul 130-722 (Korea, Republic of); Evans, Jason L. [Michigan Center for Theoretical Physics (MCTP), USAUniversity of Michigan, Ann Arbor, Michigan 48109 (United States); Morrissey, David E. [Michigan Center for Theoretical Physics (MCTP), USAUniversity of Michigan, Ann Arbor, Michigan 48109 (United States); Kavli Institute for Theoretical Physics, University of California, Santa Barbara, California 93106-4030 (United States); Wells, James D. [Michigan Center for Theoretical Physics (MCTP), USAUniversity of Michigan, Ann Arbor, Michigan 48109 (United States); CERN, Theory Division, CH-1211 Geneva 23 (Switzerland); Kavli Institute for Theoretical Physics, University of California, Santa Barbara, California 93106-4030 (United States)

2009-01-01T23:59:59.000Z

151

Ansatz of Leptonic Mixing: The Alliance of Bi-Maximal Mixing with a Single-Angle Rotation  

E-Print Network [OSTI]

We introduce an ansatz of the PMNS matrix that consists of specific types of transformations. Bi-maximal mixing is taken for the neutrino masses, while a single-angle rotation in the 1-2 block is taken for the charged lepton masses. Motivated by the implications of the recent results on neutrino oscillations, $\\theta_{23}$ in the first octant and non-zero $\\theta_{13}$ are predicted by the ansatz. Three physical mixing angles are expressed in terms of a single variable, the 1-2 angle of charged leptons, so that a simple relation among the angles has been obtained: $\\tan\\theta_{13}=\\sqrt{2}(\\sin\\theta_{23}-\\sin\\theta_{12})$. It follows that a model of the inverted hierarchy that can produce the given ansatz is proposed.

Kim Siyeon

2012-08-13T23:59:59.000Z

152

Ansatz of Leptonic Mixing: The Alliance of Bi-Maximal Mixing with a Single-Angle Rotation  

E-Print Network [OSTI]

We introduce an ansatz of the PMNS matrix that consists of specific types of transformations. Bi-maximal mixing is taken for the neutrino masses, while a single-angle rotation in the 1-2 block is taken for the charged lepton masses. Motivated by the implications of the recent results on neutrino oscillations, $\\theta_{23}$ in the first octant and non-zero $\\theta_{13}$ are predicted by the ansatz. Three physical mixing angles are expressed in terms of a single variable, the 1-2 angle of charged leptons, so that a simple relation among the angles has been obtained: $\\tan\\theta_{13}=\\sqrt{2}(\\sin\\theta_{23}-\\sin\\theta_{12})$. It follows that a model of the inverted hierarchy that can produce the given ansatz is proposed.

Siyeon, Kim

2012-01-01T23:59:59.000Z

153

Measurement of the Michel Parameter xi" in Polarized Muon Decay and Implications on Exotic Couplings of the Leptonic Weak Interaction  

E-Print Network [OSTI]

The Michel parameter xi" has been determined from a measurement of the longitudinal polarization of positrons emitted in the decay of polarized and depolarized muons. The result, xi" = 0.981 +- 0.045stat +- 0.003syst, is consistent with the Standard Model prediction of unity, and provides an order of magnitude improvement in the relative precision of this parameter. This value sets new constraints on exotic couplings beyond the dominant V-A description of the leptonic weak interaction.

R. Prieels; O. Naviliat-Cuncic; P. Knowles; P. Van Hove; X. Morelle; J. Egger; J. Deutsch; J. Govaerts; W. Fetscher; K. Kirch; J. Lang

2014-08-07T23:59:59.000Z

154

DELAYED ONSET OF HIGH-ENERGY EMISSIONS IN LEPTONIC AND HADRONIC MODELS OF GAMMA-RAY BURSTS  

SciTech Connect (OSTI)

The temporal-spectral evolution of the prompt emission of gamma-ray bursts is simulated numerically for both leptonic and hadronic models. For weak enough magnetic fields, leptonic models can reproduce the few seconds delay of the onset of GeV photon emission observed by Fermi-LAT, due to the slow growth of the target photon field for inverse Compton scattering. For stronger magnetic fields, the GeV delay can be explained with hadronic models, due to the long acceleration timescale of protons and the continuous photopion production after the end of the particle injection. While the FWHMs of the MeV and GeV light curves are almost the same in one-zone leptonic models, the FWHMs of the 1-30 GeV light curves in hadronic models are significantly wider than those of the 0.1-1 MeV light curves. The amount of the GeV delay depends on the importance of the Klein-Nishina effect in both the leptonic and hadronic models. In our examples of hadronic models the energies of the escaped neutrons are comparable to the gamma-ray energy, although their contribution to the ultra high-energy cosmic rays is still subdominant. The resulting neutrino spectra are hard enough to avoid the flux limit constraint from IceCube. The delay of the neutrino emission onset is up to several times longer than the corresponding delay of the GeV photon emission onset. The quantitative differences in the light curves for various models may be further tested with future atmospheric Cerenkov telescopes whose effective area is larger than that of Fermi-LAT, such as CTA.

Asano, Katsuaki [Interactive Research Center of Science, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550 (Japan); Meszaros, Peter, E-mail: asano@phys.titech.ac.jp, E-mail: nnp@astro.psu.edu [Department of Astronomy and Astrophysics, Department of Physics, Center for Particle and Gravitational Astrophysics, Pennsylvania State University, University Park, PA 16802 (United States)

2012-10-01T23:59:59.000Z

155

Search for WW and WZ production in lepton plus jets final state at CDF  

SciTech Connect (OSTI)

We present a search for WW and WZ production in final states that contain a charged lepton (electron or muon) and at least two jets, produced in {radical}(s)=1.96 TeV pp collisions at the Fermilab Tevatron, using data corresponding to 1.2 fb{sup -1} of integrated luminosity collected with the CDF II detector. Diboson production in this decay channel has yet to be observed at hadron colliders due to the large single W plus jets background. An artificial neural network has been developed to increase signal sensitivity, as compared with an event selection based on conventional cuts. We set a 95% confidence level upper limit of {sigma}{sub WW}xBR(W{yields}l{nu}{sub l},W{yields}jets)+{sigma}{sub WZ}xBR(W{yields}l{nu}{sub l},Z{yields}jets)<2.88 pb, which is consistent with the standard model next-to-leading-order cross section calculation for this decay channel of 2.09{+-}0.12 pb.

Aaltonen, T.; Maki, T.; Mehtala, P.; Orava, R.; Osterberg, K.; Saarikko, H.; Remortel, N. van [Division of High Energy Physics, Department of Physics, University of Helsinki and Helsinki Institute of Physics, FIN-00014, Helsinki (Finland); Adelman, J.; Brubaker, E.; Fedorko, W. T.; Grosso-Pilcher, C.; Ketchum, W.; Kim, Y. K.; Krop, D.; Kwang, S.; Lee, H. S.; Paramonov, A. A.; Schmidt, M. A.; Shiraishi, S.; Shochet, M. [Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637 (United States)] (and others)

2009-06-01T23:59:59.000Z

156

Connecting Leptonic CP Violation, Lightest Neutrino Mass and Baryon Asymmetry Through Type II Seesaw  

E-Print Network [OSTI]

We study the possibility of connecting leptonic Dirac CP phase $\\delta$, lightest neutrino mass and baryon asymmetry of the Universe within the framework of a model where both type I and type II seesaw mechanisms contribute to neutrino mass. Type I seesaw gives rise to Tri-Bimaximal (TBM) type neutrino mixing whereas type II seesaw acts as a correction in order to generate non-zero $\\theta_{13}$. We derive the most general form of type II seesaw mass matrix which can not only give rise to correct neutrino mixing angles but also can generate non-trivial value of $\\delta$. Considering both the cases where type II seesaw is sub-leading and is equally dominant compared to type I seesaw, we correlate the type II seesaw term with $\\delta$ and lightest neutrino mass. We further constrain the Dirac CP phase $\\delta$ and hence the type II seesaw mass matrix from the requirement of producing the observed baryon asymmetry through the mechanism of leptogenesis.

Kalita, Rupam

2014-01-01T23:59:59.000Z

157

Radio Synchrotron Emission from Secondary Leptons in the Vicinity of Sgr A*  

E-Print Network [OSTI]

A point-like source of ~TeV gamma-rays has recently been seen towards the Galactic center by HESS and other air Cerenkov telescopes. In recent work (Ballantyne et al. 2007), we demonstrated that these gamma-rays can be attributed to high-energy protons that (i) are accelerated close to the event horizon of the central black hole, Sgr A*, (ii) diffuse out to ~pc scales, and (iii) finally interact to produce gamma-rays. The same hadronic collision processes will necessarily lead to the creation of electrons and positrons. Here we calculate the synchrotron emissivity of these secondary leptons in the same magnetic field configuration through which the initiating protons have been propagated in our model. We compare this emission with the observed ~GHz radio spectrum of the inner few pc region which we have assembled from archival data and new measurements we have made with the Australia Telescope Compact Array. We find that our model predicts secondary synchrotron emission with a steep slope consistent with the observations but with an overall normalization that is too large by a factor of ~ 2. If we further constrain our theoretical gamma-ray curve to obey the implicit EGRET upper limit on emission from this region we predict radio emission that is consistent with observations, i.e., the hadronic model of gamma ray emission can, simultaneously and without fine-tuning, also explain essentially all the diffuse radio emission detected from the inner few pc of the Galaxy.

Roland M. Crocker; David Jones; David R. Ballantyne; Fulvio Melia

2007-08-07T23:59:59.000Z

158

Electromagnetic annihilation into charged leptons and scattering off nucleons of spin-3/2 Majorana particles  

E-Print Network [OSTI]

We compute the cross section for the electromagnetic annihilation into charged leptons, and the electromagnetic scattering off nucleons, of spin-3/2 self-conjugate (Majorana) particles using the general form of the electromagnetic vertex function that was obtained previously for such particles. In addition to the restrictions imposed by common principles such as electromagnetic gauge invariance and hermiticity, the vertex function incorporates the restriction due to the Majorana condition as well as the particular properties related to the spinors in the Rarita-Schwinger representation, and is the counterpart of the so-called anapole interaction of spin-1/2 Majorana particles. The formulas obtained for the cross sections share certain similarities with the corresponding results in the spin-1/2 case, but they also reveal some important differences which are pointed out and discussed. The results given here can be useful for applications involving the electromagnetic interactions of spin-3/2 or spin-1/2 Majorana particles in several contexts that have been of interest in the recent literature such as nucleosynthesis and dark matter.

Jos F. Nieves; Sarira Sahu

2014-08-06T23:59:59.000Z

159

A measurement of the top pair production cross-section in the dilepton channel using lepton plus track selection  

SciTech Connect (OSTI)

Using 1.1 fb{sup -1} of data collected by the Collider Detector at Fermilab (CDF) from Run II of the Fermilab Tevatron, they measure the t{bar t} production cross section in events with two leptons, significant missing transverse energy, and {ge} 2 jets. As the Run II dataset grows, more stringent tests of Standard Model predictions for the top quark sector are becoming possible. The dilepton channel, where both top quarks decay t {yields} Wb {yields} {ell}{nu}b, is of particular interest due to its high purity even in the absence of a b jet 'tagging' requirement. Use of an isolated track as the second lepton significant increases the dilepton acceptance, at the price of some increase in background, particular from W + jets events where one of the jets is identified as a lepton. With the amount of data available, it has been possible to improve the estimate of the contribution from that background, reflected in a reduced systematic uncertainty. Assuming a branching ratio of BR(W {yields} {ell}{nu}) = 10.8% and a top mass of m{sub t} = 175 GeV/c{sup 2}, the measured cross-section is {sigma}(p{bar p} {yields} t{bar t}) = 8.3 {+-} 1.3(stat.) {+-} 0.7(syst.) {+-} 0.5(lumi.) pb. The result is consistent with the Standard Model prediction of 6.7{sub -0.9}{sup +0.7} pb and represents a significant improvement in precision over previous results using this selection.

Mills, Corrinne Elaine; /UC, Santa Barbara

2007-06-01T23:59:59.000Z

160

Same-sign trileptons and four leptons as signatures of new physics at the Large Hadron Collider  

SciTech Connect (OSTI)

We point out that same-sign multilepton events, not given due attention yet for new physics search, can be extremely useful at the Large Hadron Collider. After showing the easy reducibility of the standard model backgrounds, we demonstrate the viability of same-sign trilepton signals for R-parity breaking supersymmetry, at both 7 and 14 TeV. We find that same-sign four-leptons, too, can have appreciable rates. Same-sign trileptons are also expected, for example, in Little Higgs theories with T-parity broken by anomaly terms.

Mukhopadhyaya, Biswarup [Regional Centre for Accelerator-based Particle Physics, Harish-Chandra Research Institute, Chhatnag Road, Jhusi, Allahabad - 211 019 (India); Indian Association for the Cultivation of Science, Kolkata-700 032 (India); Mukhopadhyay, Satyanarayan [Regional Centre for Accelerator-based Particle Physics, Harish-Chandra Research Institute, Chhatnag Road, Jhusi, Allahabad - 211 019 (India)

2010-08-01T23:59:59.000Z

Note: This page contains sample records for the topic "leptons leptons leptons" from the National Library of EnergyBeta (NLEBeta).
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161

Self-sustained asymmetry of lepton-number emission: A new phenomenon during the supernova shock-accretion phase in three dimensions  

E-Print Network [OSTI]

During the stalled-shock phase of our 3D hydrodynamical core-collapse simulations with energy-dependent, 3-flavor neutrino transport, the lepton-number flux (nue minus antinue) emerges predominantly in one hemisphere. This novel, spherical-symmetry breaking neutrino-hydrodynamical instability is termed LESA for "Lepton-number Emission Self-sustained Asymmetry." While the individual nue and antinue fluxes show a pronounced dipole pattern, the heavy-flavor neutrino fluxes and the overall luminosity are almost spherically symmetric. Initially, LESA seems to develop stochastically from convective fluctuations, it exists for hundreds of milliseconds or more, and it persists during violent shock sloshing associated with the standing accretion shock instability. The nue minus antinue flux asymmetry originates mainly below the neutrinosphere in a region of pronounced proto-neutron star (PNS) convection, which is stronger in the hemisphere of enhanced lepton-number flux. On this side of the PNS, the mass-accretion rate of lepton-rich matter is larger, amplifying the lepton-emission asymmetry, because the spherical stellar infall deflects on a dipolar deformation of the stalled shock. The increased shock radius in the hemisphere of less mass accretion and minimal lepton-number flux (antinue flux maximum) is sustained by stronger convection on this side, which is boosted by stronger neutrino heating because the average antinue energy is higher than the average nue energy. Asymmetric heating thus supports the global deformation despite extremely nonstationary convective overturn behind the shock. While these different elements of LESA form a consistent picture, a full understanding remains elusive at present. There may be important implications for neutrino-flavor oscillations, the neutron-to-proton ratio in the neutrino-heated supernova ejecta, and neutron-star kicks, which remain to be explored.

Irene Tamborra; Florian Hanke; Hans-Thomas Janka; Bernhard Mueller; Georg G. Raffelt; Andreas Marek

2014-07-31T23:59:59.000Z

162

Self-sustained Asymmetry of Lepton-number Emission: A New Phenomenon during the Supernova Shock-accretion Phase in Three Dimensions  

Science Journals Connector (OSTI)

During the stalled-shock phase of our three-dimensional, hydrodynamical core-collapse simulations with energy-dependent, three-flavor neutrino transport, the lepton-number flux (? e minus ) emerges predominantly in one hemisphere. This novel, spherical-symmetry breaking neutrino-hydrodynamical instability is termed LESA for "Lepton-number Emission Self-sustained Asymmetry." While the individual ? e and fluxes show a pronounced dipole pattern, the heavy-flavor neutrino fluxes and the overall luminosity are almost spherically symmetric. Initially, LESA seems to develop stochastically from convective fluctuations. It exists for hundreds of milliseconds or more and persists during violent shock sloshing associated with the standing accretion shock instability. The ? e minus flux asymmetry originates predominantly below the neutrinosphere in a region of pronounced proto-neutron star (PNS) convection, which is stronger in the hemisphere of enhanced lepton-number flux. On this side of the PNS, the mass accretion rate of lepton-rich matter is larger, amplifying the lepton-emission asymmetry, because the spherical stellar infall deflects on a dipolar deformation of the stalled shock. The increased shock radius in the hemisphere of less mass accretion and minimal lepton-number flux ( flux maximum) is sustained by stronger convection on this side, which is boosted by stronger neutrino heating due to . Asymmetric heating thus supports the global deformation despite extremely nonstationary convective overturn behind the shock. While these different elements of the LESA phenomenon form a consistent picture, a full understanding remains elusive at present. There may be important implications for neutrino-flavor oscillations, the neutron-to-proton ratio in the neutrino-heated supernova ejecta, and neutron-star kicks, which remain to be explored.

Irene Tamborra; Florian Hanke; Hans-Thomas Janka; Bernhard Mller; Georg G. Raffelt; Andreas Marek

2014-01-01T23:59:59.000Z

163

Search for pair production of scalar top quarks decaying to a tau lepton and a b quark in 1.96 TeV ppbar collisions  

SciTech Connect (OSTI)

I present the results of a search for pair production of scalar top quarks ({tilde t}{sub 1}) in an R-parity violating supersymmetric scenario using 322 pb{sup -1} of p{bar p} collisions at {radical}s = 1.96 TeV collected by the upgraded Collider Detector at Fermilab. I assume each {tilde t}{sub 1} decays into a {tau} lepton and a b quark, with branching ratio {beta}, and search for final states containing either an electron or a muon from a leptonic {tau} decay, a hadronically decaying {tau} lepton, and two or more jets. Two candidate events pass my final selection criteria, consistent with the expectation from standard model processes. I present upper limits on the cross section times branching ratio squared {sigma}({tilde t}{sub 1}{bar {tilde t}}{sub 1}) x {beta}{sup 2} as a function of the stop mass m({tilde t}{sub 1}). Assuming {beta} = 1, I set a 95% confidence level limit m({tilde t}{sub 1}) > 153 GeV=c{sup 2}. These limits are also fully applicable to the case of a pair produced third generation scalar leptoquark that decays into a {tau} lepton and a b quark.

Khotilovich, Vadim, G.; /Texas A-M

2008-05-01T23:59:59.000Z

164

Test of QED to fourth order by study of four-lepton final states in e(+)e(?) interactions at 29 GeV with the HRS detector  

E-Print Network [OSTI]

Data taken with the High Resolution Spectrometer detector at the SLAC storage ring PEP were used to test QED to fourth order in the coupling constant ?. The experiment studied four-lepton final states produced at high Q(2) in e(+)e(?) interactions...

Baringer, Philip S.

1990-10-01T23:59:59.000Z

165

Search for new phenomena in events with three or more charged leptons in $pp$ collisions at $\\sqrt{s}=8$ TeV with the ATLAS detector  

E-Print Network [OSTI]

A generic search for anomalous production of events with at least three charged leptons is presented. The data sample consists of $pp$ collisions at $\\sqrt{s}=8$ TeV collected in 2012 by the ATLAS experiment at the CERN Large Hadron Collider, and corresponds to an integrated luminosity of 20.3 fb$^{-1}$. Events are required to have at least three selected lepton candidates, at least two of which must be electrons or muons, while the third may be a hadronically decaying tau. Selected events are categorized based on their lepton flavour content and signal regions are constructed using several kinematic variables of interest. No significant deviations from Standard Model predictions are observed. Model-independent upper limits on contributions from beyond the Standard Model phenomena are provided for each signal region, along with prescription to re-interpret the limits for any model. Constraints are also placed on models predicting doubly charged Higgs bosons and excited leptons. For doubly charged Higgs...

Aad, Georges; ATLAS Collaboration; Abdallah, Jalal; Abdel Khalek, Samah; Abdinov, Ovsat; Aben, Rosemarie; Abi, Babak; Abolins, Maris; AbouZeid, Ossama; Abramowicz, Halina; Abreu, Henso; Abreu, Ricardo; Abulaiti, Yiming; Acharya, Bobby Samir; Adamczyk, Leszek; Adams, David; Adelman, Jahred; Adomeit, Stefanie; Adye, Tim; Agatonovic-Jovin, Tatjana; Aguilar-Saavedra, Juan Antonio; Agustoni, Marco; Ahlen, Steven; Ahmadov, Faig; Aielli, Giulio; Akerstedt, Henrik; kesson, Torsten Paul Ake; Akimoto, Ginga; Akimov, Andrei; Alberghi, Gian Luigi; Albert, Justin; Albrand, Solveig; Alconada Verzini, Maria Josefina; Aleksa, Martin; Aleksandrov, Igor; Alexa, Calin; Alexander, Gideon; Alexandre, Gauthier; Alexopoulos, Theodoros; Alhroob, Muhammad; Alimonti, Gianluca; Alio, Lion; Alison, John; Allbrooke, Benedict; Allison, Lee John; Allport, Phillip; Aloisio, Alberto; Alonso, Alejandro; Alonso, Francisco; Alpigiani, Cristiano; Altheimer, Andrew David; Alvarez Gonzalez, Barbara; Alviggi, Mariagrazia; Amako, Katsuya; Amaral Coutinho, Yara; Amelung, Christoph; Amidei, Dante; Amor Dos Santos, Susana Patricia; Amorim, Antonio; Amoroso, Simone; Amram, Nir; Amundsen, Glenn; Anastopoulos, Christos; Ancu, Lucian Stefan; Andari, Nansi; Andeen, Timothy; Anders, Christoph Falk; Anders, Gabriel; Anderson, Kelby; Andreazza, Attilio; Andrei, George Victor; Anduaga, Xabier; Angelidakis, Stylianos; Angelozzi, Ivan; Anger, Philipp; Angerami, Aaron; Anghinolfi, Francis; Anisenkov, Alexey; Anjos, Nuno; Annovi, Alberto; Antonelli, Mario; Antonov, Alexey; Antos, Jaroslav; Anulli, Fabio; Aoki, Masato; Aperio Bella, Ludovica; Arabidze, Giorgi; Arai, Yasuo; Araque, Juan Pedro; Arce, Ayana; Arduh, Francisco Anuar; Arguin, Jean-Francois; Argyropoulos, Spyridon; Arik, Metin; Armbruster, Aaron James; Arnaez, Olivier; Arnal, Vanessa; Arnold, Hannah; Arratia, Miguel; Arslan, Ozan; Artamonov, Andrei; Artoni, Giacomo; Asai, Shoji; Asbah, Nedaa; Ashkenazi, Adi; sman, Barbro; Asquith, Lily; Assamagan, Ketevi; Astalos, Robert; Atkinson, Markus; Atlay, Naim Bora; Auerbach, Benjamin; Augsten, Kamil; Aurousseau, Mathieu; Avolio, Giuseppe; Axen, Bradley; Azuelos, Georges; Azuma, Yuya; Baak, Max; Baas, Alessandra; Bacci, Cesare; Bachacou, Henri; Bachas, Konstantinos; Backes, Moritz; Backhaus, Malte; Badescu, Elisabeta; Bagiacchi, Paolo; Bagnaia, Paolo; Bai, Yu; Bain, Travis; Baines, John; Baker, Oliver Keith; Balek, Petr; Balli, Fabrice; Banas, Elzbieta; Banerjee, Swagato; Bannoura, Arwa A E; Bansil, Hardeep Singh; Barak, Liron; Baranov, Sergei; Barberio, Elisabetta Luigia; Barberis, Dario; Barbero, Marlon; Barillari, Teresa; Barisonzi, Marcello; Barklow, Timothy; Barlow, Nick; Barnes, Sarah Louise; Barnett, Bruce; Barnett, Michael; Barnovska, Zuzana; Baroncelli, Antonio; Barone, Gaetano; Barr, Alan; Barreiro, Fernando; Barreiro Guimares da Costa, Joo; Bartoldus, Rainer; Barton, Adam Edward; Bartos, Pavol; Bartsch, Valeria; Bassalat, Ahmed; Basye, Austin; Bates, Richard; Batista, Santiago Juan; Batley, Richard; Battaglia, Marco; Battistin, Michele; Bauer, Florian; Bawa, Harinder Singh; Beacham, James Baker; Beattie, Michael David; Beau, Tristan; Beauchemin, Pierre-Hugues; Beccherle, Roberto; Bechtle, Philip; Beck, Hans Peter; Becker, Anne Kathrin; Becker, Sebastian; Beckingham, Matthew; Becot, Cyril; Beddall, Andrew; Beddall, Ayda; Bedikian, Sourpouhi; Bednyakov, Vadim; Bee, Christopher; Beemster, Lars; Beermann, Thomas; Begel, Michael; Behr, Katharina; Belanger-Champagne, Camille; Bell, Paul; Bell, William; Bella, Gideon; Bellagamba, Lorenzo; Bellerive, Alain; Bellomo, Massimiliano; Belotskiy, Konstantin; Beltramello, Olga; Benary, Odette; Benchekroun, Driss; Bendtz, Katarina; Benekos, Nektarios; Benhammou, Yan; Benhar Noccioli, Eleonora; Benitez Garcia, Jorge-Armando; Benjamin, Douglas; Bensinger, James; Bentvelsen, Stan; Berge, David; Bergeaas Kuutmann, Elin; Berger, Nicolas; Berghaus, Frank; Beringer, Jrg; Bernard, Clare; Bernard, Nathan Rogers; Bernius, Catrin; Bernlochner, Florian Urs; Berry, Tracey; Berta, Peter; Bertella, Claudia; Bertoli, Gabriele; Bertolucci, Federico; Bertsche, Carolyn; Bertsche, David; Besana, Maria Ilaria; Besjes, Geert-Jan; Bessidskaia, Olga; Bessner, Martin Florian; Besson, Nathalie; Betancourt, Christopher; Bethke, Siegfried; Bevan, Adrian John; Bhimji, Wahid; Bianchi, Riccardo-Maria; Bianchini, Louis; Bianco, Michele; Biebel, Otmar; Bieniek, Stephen Paul; Bierwagen, Katharina; Biglietti, Michela; Bilbao De Mendizabal, Javier; Bilokon, Halina; Bindi, Marcello; Binet, Sebastien; Bingul, Ahmet; Bini, Cesare

2014-01-01T23:59:59.000Z

166

Search for standard model production of four top quarks in the lepton + jets channel in pp collisions at ?s = 8 TeV  

E-Print Network [OSTI]

A search is presented for standard model (SM) production of four top quarks (tttt) in pp collisions in the lepton + jets channel. The data correspond to an integrated luminosity of 19.6 fb[superscript ?1] recorded at a ...

CMS Collaboration

167

Two-flavor QCD correction to lepton magnetic moments at leading-order in the electromagnetic coupling  

SciTech Connect (OSTI)

We present a reliable nonperturbative calculation of the QCD correction, at leading-order in the electromagnetic coupling, to the anomalous magnetic moment of the electron, muon and tau leptons using two-flavor lattice QCD. We use multiple lattice spacings, multiple volumes and a broad range of quark masses to control the continuum, infinite-volume and chiral limits. We examine the impact of the commonly ignored disconnected diagrams and introduce a modification to the previously used method that results in a well-controlled lattice calculation. We obtain 1.513 (43) 10^-12, 5.72 (16) 10^-8 and 2.650 (54) 10^-6 for the leading-order QCD correction to the anomalous magnetic moment of the electron, muon and tau respectively, each accurate to better than 3%.

Dru Renner, Xu Feng, Karl Jansen, Marcus Petschlies

2011-08-01T23:59:59.000Z

168

Search for the standard model Higgs boson decaying to in the fully leptonic final state in pp collisions at  

SciTech Connect (OSTI)

A search for the standard model Higgs boson decaying to W+W- in pp collisions at sqrt(s) = 7 TeV is reported. The data are collected at the LHC with the CMS detector, and correspond to an integrated luminosity of 4.6 inverse femtobarns. The W+W- candidates are selected in events with two charged leptons and large missing transverse energy. No significant excess of events above the standard model background expectations is observed, and upper limits on the Higgs boson production relative to the standard model Higgs expectation are derived. The standard model Higgs boson is excluded in the mass range 129-270 GeV at 95% confidence level.

Chatrchyan, Serguei; et al.

2012-03-01T23:59:59.000Z

169

Searches for the baryon- and lepton-number violating decays $B^0\\rightarrow\\Lambda_c^ \\ell^-$, $B^-\\rightarrow\\Lambda\\ell^-$, and $B^-\\rightarrow\\bar{\\Lambda}\\ell^-$  

SciTech Connect (OSTI)

Searches for B mesons decaying to final states containing a baryon and a lepton are performed, where the baryon is either {Lambda}{sub c} or {Lambda} and the lepton is a muon or an electron. These decays violate both baryon and lepton number and would be a signature of physics beyond the standard model. No significant signal is observed in any of the decay modes, and upper limits in the range (3.2 - 520) x 10{sup -8} are set on the branching fractions at the 90% confidence level.

del Amo Sanchez, P.; Lees, J.P.; Poireau, V.; Prencipe, E.; Tisserand, V.; /Annecy, LAPP; Garra Tico, J.; Grauges, E.; /Barcelona U., ECM; Martinelli, M.; /INFN, Bari /Bari U.; Milanes, D.A.; /INFN, Bari; Palano, A.; Pappagallo, M.; /INFN, Bari /Bari U.; Eigen, G.; Stugu, B.; Sun, L.; /Bergen U.; Brown, D.N.; Kerth, L.T.; Kolomensky, Yu.G.; Lynch, G.; Osipenkov, I.L.; /UC, Berkeley; Koch, H.; Schroeder, T.; /Ruhr U., Bochum /British Columbia U. /Brunel U. /Novosibirsk, IYF /UC, Irvine /UC, Riverside /UC, Santa Barbara /UC, Santa Cruz /Caltech /Cincinnati U. /Colorado U. /Colorado State U. /Dortmund U. /Dresden, Tech. U. /Ecole Polytechnique /Edinburgh U. /INFN, Ferrara /Ferrara U. /INFN, Ferrara /INFN, Ferrara /Ferrara U. /INFN, Ferrara /Frascati /INFN, Genoa /Genoa U. /INFN, Genoa /INFN, Genoa /Genoa U. /INFN, Genoa /Indian Inst. Tech., Guwahati /Harvard U. /Harvey Mudd Coll. /Heidelberg U. /Humboldt U., Berlin /Imperial Coll., London /Iowa State U. /Iowa State U. /Johns Hopkins U. /Paris U., VI-VII /LLNL, Livermore /Liverpool U. /Queen Mary, U. of London /Royal Holloway, U. of London /Royal Holloway, U. of London /Louisville U. /Mainz U., Inst. Kernphys. /Manchester U. /Maryland U. /Massachusetts U., Amherst /MIT /McGill U. /Milan U. /Milan U. /Milan U. /Milan U. /Milan U. /Mississippi U. /Montreal U. /INFN, Naples /Naples U. /NIKHEF, Amsterdam /NIKHEF, Amsterdam /Notre Dame U. /Ohio State U. /Oregon U. /INFN, Padua /Padua U. /INFN, Padua /INFN, Padua /Padua U. /Paris U., VI-VII /INFN, Perugia /Perugia U. /INFN, Pisa /Pisa U. /INFN, Pisa /Pisa, Scuola Normale Superiore /INFN, Pisa /Pisa U. /INFN, Pisa /Princeton U. /INFN, Rome /INFN, Rome /Rome U. /INFN, Rome /INFN, Rome /Rome U. /INFN, Rome /INFN, Rome /Rome U. /INFN, Rome /INFN, Rome /Rome U. /Rostock U. /Rutherford /DAPNIA, Saclay /SLAC /South Carolina U. /Southern Methodist U. /Stanford U., Phys. Dept. /SUNY, Albany /Tel Aviv U. /Tennessee U. /Texas Nuclear Corp., Austin /Texas U., Dallas /INFN, Turin /Turin U. /INFN, Trieste /Trieste U. /Valencia U. /Victoria U. /Warwick U. /Wisconsin U., Madison

2011-06-22T23:59:59.000Z

170

Search for the Lepton-Flavor-Violating Decay ! at Belle Y. Enari, 23 K. Abe, 9 K. Abe, 44 T. Abe, 9 I. Adachi, 9 H. Aihara, 46 Y. Asano, 51 T. Aso, 50 V. Aulchenko, 2  

E-Print Network [OSTI]

Search for the Lepton-Flavor-Violating Decay #28; ! #22; #17; at Belle Y. Enari, 23 K. Abe, 9 K Kaohsiung Normal University, Kaohsiung 26 National Lien-Ho Institute of Technology, Miao Li 27 Department

171

Lepton flavor violating processes \\tau ->\\mu\\gamma$, $\\tau-> 3\\mu$ and $Z-> \\mu\\tau$ in the Supersymmetric economical 3-3-1 model  

E-Print Network [OSTI]

In this work, we study the charged lepton flavor violating (cLFV) decays $\\tau-> \\mu\\gamma$, $\\tau-> 3\\mu$ and $Z->\\mu\\tau$ in the framework of the Supersymmetric economical 3-3-1 model. Analytic formulas for branching ratios (BR) of these decays are presented. We assume that there exist lepton flavor violation (LFV) sources in both right- and left-handed slepton sectors. This leads to the strong enhancement of cLFV decay rates. We also show that the effects of the LFV source to the cLFV decay rates in the left-handed slepton sector are greater than those in the right- handed slepton sector. By numerical investigation, we show that the model under consideration contains the relative light mass spectrum of sleptons which satisfies the current experimental bounds on LFV processes in the limit of small $\\tan \\gamma$. The interplay between monopole and dipole operators also was studied.

Hue, L T; Long, H N

2013-01-01T23:59:59.000Z

172

Search for the Standard Model Higgs Boson in the H to to lepton-hadron and hadron-hadron Decay Modes with the ATLAS Detector  

Science Journals Connector (OSTI)

Abstract In this proceeding, a search for a Higgs boson in the H to ? + ? ? decay mode, where both taus decay hadronically or one decay hadronically and one leptonically. The analysis is based on a data sample of proton-proton collision collected by the ATLAS detector at the Large Hadron Collider (LHC) at centre-of-mass energies of 7 TeV during 2011, corresponding to an integrated luminosity of 4.7 f b ? 1 . No significant excess is observed in the Higgs boson mass range of 100150 GeV. The observed (expected) limits on the cross-section times branching ratio for H to ? + ? ? at m H = 125 GeV are 6.2(5.9) and 6.3(6.5) for lepton-hadron and hadron-hadron decay modes, respectively.

Yuki Sakurai

2014-01-01T23:59:59.000Z

173

The lepton flavor violating decay {tau}{sup {+-}} {yields} Micro-Sign {sup {+-}} Micro-Sign {sup {+-}} Micro-Sign {sup Minus-Or-Plus-Sign} at LHCb  

SciTech Connect (OSTI)

The possibility of improving the limit on the branching fraction of the lepton flavor violating decay {tau}{sup {+-}} {yields} Micro-Sign {sup {+-}} Micro-Sign {sup {+-}} Micro-Sign {sup Minus-Or-Plus-Sign} at LHCb is discussed. It is shown that a simple, cut-based analysis is sufficient to improve the upper limit on this branching fraction within the lifetime of LHCb.

Keune, A., E-mail: anne.keune@epfl.ch [Ecole Polytechnique Federale de Lausanne, Laboratoire de Physique des Hautes Energies (Switzerland)

2012-09-15T23:59:59.000Z

174

Search for chargino and neutralino production with a Higgs boson in the decay chain in one or three leptons final state events with ATLAS  

E-Print Network [OSTI]

Searches for direct production of chargino ($\\tilde{\\chi}_1^{\\pm}$) and neutralino ($\\tilde{\\chi}_0^{2}$) leading to final states characterized by the presence of a Higgs boson are reported. Events containing missing transverse momentum and one or three leptons are selected, and various channels sensitive to different Higgs decays are considered. The analyses use 20.3 fb$^{-1}$ in $R$-parity conserving phenomenological Minimal Supersymmetric Standard Models and in simplified supersymmetric models.

David, C; The ATLAS collaboration

2014-01-01T23:59:59.000Z

175

Lepton Mixing and Cancellation of the Dirac Mass Hierarchy in SO(10) GUTs with Flavor Symmetries T7 and Sigma(81)  

E-Print Network [OSTI]

In SO(10) grand unified theories (GUTs) the hierarchy which is present in the Dirac mass term of the neutrinos is generically as strong as the one in the up-type quark mass term. We propose a mechanism to partially or completely cancel this hierarchy in the light neutrino mass matrix in the seesaw context. The two main ingredients of the cancellation mechanism are the existence of three fermionic gauge singlets and of a discrete flavor symmetry G_f which is broken at a higher scale than SO(10). Two realizations of the cancellation mechanism are presented. The realization based on the Frobenius group T7 = Z7 x Z3 leads to a partial cancellation of the hierarchy and relates maximal 2-3 lepton mixing with the geometric hierarchy of the up-quark masses. In the realization with the group Sigma(81) the cancellation is complete and tri-bimaximal lepton mixing is reproduced at the lowest order. In both cases, to fully accommodate the leptonic data we take into account additional effects such as effects of higher-dimensional operators involving more than one flavon. The heavy neutral fermion mass spectra are considered. For both realizations we analyze the flavon potential at the renormalizable level as well as ways to generate the Cabibbo angle.

Claudia Hagedorn; Michael A. Schmidt; Alexei Yu. Smirnov

2008-11-18T23:59:59.000Z

176

Double Beta Decay, Lepton Flavour Violation and Collider Signatures of Left-Right Symmetric Models with Spontaneous D Parity Breaking  

E-Print Network [OSTI]

We propose a class of left-right symmetric models (LRSMs) with spontaneous D parity breaking, where SU(2)_R breaks at the TeV scale while discrete left-right symmetry breaks around 10^9 GeV. By embedding this framework in a non-supersymmetric SO(10) Grand Unified Theory (GUT) with Pati-Salam symmetry as the highest intermediate breaking step, we obtain g_R / g_L ~ 0.6 between the right- and left-handed gauge couplings at the TeV scale. This leads to a suppression of beyond the Standard Model phenomena induced by the right-handed gauge coupling. Here we focus specifically on the consequences for neutrinoless double beta decay, low energy lepton flavour violation and LHC signatures due to the suppressed right handed currents. Interestingly, the reduced g_R allows us to interpret an excess of events observed recently in the range of 1.9 TeV to 2.4 TeV by the CMS group at the LHC as the signature of a right handed gauge boson in LRSMs with spontaneous D parity breaking. Moreover, the reduced right-handed gauge co...

Deppisch, Frank F; Patra, Sudhanwa; Sahu, Narendra; Sarkar, Utpal

2014-01-01T23:59:59.000Z

177

Exclusion of exotic top-like quarks with -4/3 electric charge using jet-charge tagging in single-lepton ttbar events at CDF  

E-Print Network [OSTI]

We report on a measurement of the top-quark electric charge in ttbar events in which one W boson originating from the top-quark pair decays into leptons and the other into hadrons. The event sample was collected by the CDF II detector in sqrt(s)=1.96 TeV proton-antiproton collisions and corresponds to 5.6 fb^(-1). We find the data to be consistent with the standard model and exclude the existence of an exotic quark with -4/3 electric charge and mass of the conventional top quark at the 99% confidence level.

CDF Collaboration; T. Aaltonen; S. Amerio; D. Amidei; A. Anastassov; A. Annovi; J. Antos; G. Apollinari; J. A. Appel; T. Arisawa; A. Artikov; J. Asaadi; W. Ashmanskas; B. Auerbach; A. Aurisano; F. Azfar; W. Badgett; T. Bae; A. Barbaro-Galtieri; V. E. Barnes; B. A. Barnett; P. Barria; P. Bartos; M. Bauce; F. Bedeschi; S. Behari; G. Bellettini; J. Bellinger; D. Benjamin; A. Beretvas; A. Bhatti; K. R. Bland; B. Blumenfeld; A. Bocci; A. Bodek; V. Boisvert; D. Bortoletto; J. Boudreau; A. Boveia; L. Brigliadori; C. Bromberg; E. Brucken; J. Budagov; H. S. Budd; K. Burkett; G. Busetto; P. Bussey; P. Butti; A. Buzatu; A. Calamba; S. Camarda; M. Campanelli; F. Canelli; B. Carls; D. Carlsmith; R. Carosi; S. Carrillo; B. Casal; M. Casarsa; A. Castro; P. Catastini; D. Cauz; V. Cavaliere; M. Cavalli-Sforza; A. Cerri; L. Cerrito; Y. C. Chen; M. Chertok; G. Chiarelli; G. Chlachidze; K. Cho; D. Chokheli; M. A. Ciocci; A. Clark; C. Clarke; M. E. Convery; J. Conway; M. Corbo; M. Cordelli; C. A. Cox; D. J. Cox; M. Cremonesi; D. Cruz; J. Cuevas; R. Culbertson; N. d'Ascenzo; M. Datta; P. De Barbaro; L. Demortier; M. Deninno; M. d'Errico; F. Devoto; A. Di Canto; B. Di Ruzza; J. R. Dittmann; M. D'Onofrio; S. Donati; M. Dorigo; A. Driutti; K. Ebina; R. Edgar; A. Elagin; R. Erbacher; S. Errede; B. Esham; R. Eusebi; S. Farrington; J. P. Fernndez Ramos; R. Field; G. Flanagan; R. Forrest; M. Franklin; J. C. Freeman; H. Frisch; Y. Funakoshi; A. F. Garfinkel; P. Garosi; H. Gerberich; E. Gerchtein; S. Giagu; V. Giakoumopoulou; K. Gibson; C. M. Ginsburg; N. Giokaris; P. Giromini; G. Giurgiu; V. Glagolev; D. Glenzinski; M. Gold; D. Goldin; A. Golossanov; G. Gomez; G. Gomez-Ceballos; M. Goncharov; O. Gonzlez Lpez; I. Gorelov; A. T. Goshaw; K. Goulianos; E. Gramellini; S. Grinstein; C. Grosso-Pilcher; R. C. Group; J. Guimaraes da Costa; S. R. Hahn; J. Y. Han; F. Happacher; K. Hara; M. Hare; R. F. Harr; T. Harrington-Taber; K. Hatakeyama; C. Hays; J. Heinrich; M. Herndon; A. Hocker; Z. Hong; W. Hopkins; S. Hou; R. E. Hughes; U. Husemann; M. Hussein; J. Huston; G. Introzzi; M. Iori; A. Ivanov; E. James; D. Jang; B. Jayatilaka; E. J. Jeon; S. Jindariani; M. Jones; K. K. Joo; S. Y. Jun; T. R. Junk; M. Kambeitz; T. Kamon; P. E. Karchin; A. Kasmi; Y. Kato; W. Ketchum; J. Keung; B. Kilminster; D. H. Kim; H. S. Kim; J. E. Kim; M. J. Kim; S. B. Kim; S. H. Kim; Y. J. Kim; Y. K. Kim; N. Kimura; M. Kirby; K. Knoepfel; K. Kondo; D. J. Kong; J. Konigsberg; A. V. Kotwal; M. Kreps; J. Kroll; M. Kruse; T. Kuhr; M. Kurata; A. T. Laasanen; S. Lammel; M. Lancaster; K. Lannon; G. Latino; H. S. Lee; J. S. Lee; S. Leo; S. Leone; J. D. Lewis; A. Limosani; E. Lipeles; A. Lister; H. Liu; Q. Liu; T. Liu; S. Lockwitz; A. Loginov; A. Luc; D. Lucchesi; J. Lueck; P. Lujan; P. Lukens; G. Lungu; J. Lys; R. Lysak; R. Madrak; P. Maestro; S. Malik; G. Manca; A. Manousakis-Katsikakis; F. Margaroli; P. Marino; M. Martnez; K. Matera; M. E. Mattson; A. Mazzacane; P. Mazzanti; K. S. McFarland; R. McNulty; A. Mehta; P. Mehtala; C. Mesropian; T. Miao; D. Mietlicki; A. Mitra; H. Miyake; S. Moed; N. Moggi; C. S. Moon; R. Moore; M. J. Morello; A. Mukherjee; Th. Muller; P. Murat; M. Mussini; J. Nachtman; Y. Nagai; J. Naganoma; I. Nakano; A. Napier; J. Nett; C. Neu; T. Nigmanov; L. Nodulman; S. Y. Noh; O. Norniella; L. Oakes; S. H. Oh; Y. D. Oh; I. Oksuzian; T. Okusawa; R. Orava; L. Ortolan; C. Pagliarone; E. Palencia; P. Palni; V. Papadimitriou; W. Parker; G. Pauletta; M. Paulini; C. Paus; T. J. Phillips; G. Piacentino; E. Pianori; J. Pilot; K. Pitts; C. Plager; L. Pondrom; S. Poprocki; K. Potamianos; A. Pranko; F. Prokoshin; F. Ptohos; G. Punzi; N. Ranjan; I. Redondo Fernndez; P. Renton; M. Rescigno; F. Rimondi; L. Ristori; A. Robson; T. Rodriguez; S. Rolli; M. Ronzani; R. Roser; J. L. Rosner; F. Ruffini; A. Ruiz; J. Russ; V. Rusu; W. K. Sakumoto; Y. Sakurai; L. Santi; K. Sato; V. Saveliev; A. Savoy-Navarro; P. Schlabach; E. E. Schmidt; T. Schwarz; L. Scodellaro; F. Scuri; S. Seidel; Y. Seiya; A. Semenov; F. Sforza; S. Z. Shalhout; T. Shears; P. F. Shepard; M. Shimojima; M. Shochet; I. Shreyber-Tecker; A. Simonenko; P. Sinervo; K. Sliwa; J. R. Smith; F. D. Snider; H. Song; V. Sorin; M. Stancari; R. St. Denis; B. Stelzer; O. Stelzer-Chilton; D. Stentz; J. Strologas; Y. Sudo; A. Sukhanov; I. Suslov; K. Takemasa; Y. Takeuchi; J. Tang; M. Tecchio; P. K. Teng; J. Thom; E. Thomson; V. Thukral; D. Toback; S. Tokar; K. Tollefson; T. Tomura; D. Tonelli; S. Torre; D. Torretta; P. Totaro; M. Trovato; F. Ukegawa; S. Uozumi; F. Vzquez; G. Velev; C. Vellidis; C. Vernieri; M. Vidal; R. Vilar; J. Vizn; M. Vogel; G. Volpi; P. Wagner; R. Wallny; S. M. Wang; A. Warburton; D. Waters; W. C. Wester III; D. Whiteson; A. B. Wicklund; S. Wilbur; H. H. Williams; J. S. Wilson; P. Wilson; B. L. Winer; P. Wittich; S. Wolbers; H. Wolfe; T. Wright; X. Wu; Z. Wu; K. Yamamoto; D. Yamato; T. Yang

2014-10-09T23:59:59.000Z

178

Collider Detector at Fermilab (CDF): Data from W, Z bosons and Drell Yan lepton pairs research of the CDF Electroweak Group  

DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

The Collider Detector at Fermilab (CDF) is a Tevatron experiment at Fermilab. The Tevatron, a powerful particle accelerator, accelerates protons and antiprotons close to the speed of light, and then makes them collide head-on inside the CDF detector. The CDF detector is used to study the products of such collisions. The CDF Physics Group at Fermilab is organized into six working groups, each with a specific focus. The Electroweak group studies production and properties of W, Z bosons and Drell Yan lepton pairs. Their public web page makes data and numerous figures available from both CDF Runs I and II.

179

Heavy-flavour decay lepton measurements in pp, p-Pb, and Pb-Pb collisions with ALICE at the LHC  

E-Print Network [OSTI]

We present the measurements of electrons and muons from the semi-leptonic decays of heavy-flavour hadrons measured in the central and forward rapidity regions with ALICE in pp, Pb-Pb, and p-Pb, collisions at the LHC. The pT-differential production cross section in pp collisions, the elliptic flow in Pb-Pb collisions, and the nuclear modification factor in Pb-Pb and p-Pb collisions are shown. The results are compared to theoretical predictions.

Sarah LaPointe; on behalf of the ALICE Collaboration

2014-01-27T23:59:59.000Z

180

Measurement of the top-quark mass in the lepton+jets channel using a matrix element technique with the CDF II detector  

SciTech Connect (OSTI)

A measurement of the top-quark mass is presented using Tevatron data from proton-antiproton collisions at center-of-mass energy ?s = 1.96 TeV collected with the CDF II detector. Events are selected from a sample of candidates for production of tt? pairs that decay into the lepton+jets channel. The top-quark mass is measured with an unbinned maximum likelihood method where the event probability density functions are calculated using signal and background matrix elements, as well as a set of parameterized jet-to-parton transfer functions. The likelihood function is maximized with respect to the top-quark mass, the signal fraction in the sample, and a correction to the jet energy scale (JES) calibration of the calorimeter jets. The simultaneous measurement of the JES correction ({Delta}{sub JES}) amounts to an additional in situ jet energy calibration based on the known mass of the hadronically decaying W boson. Using the data sample of 578 lepton+jets candidate events, corresponding to 3.2 fb-1 of integrated luminosity, the top-quark mass is measured to be mt = 172.4 1.4 (stat + ?JES) 1.3 (syst) GeV/c2.

Aaltonen, T [Helsinki Inst. of Phys.; Alvarez Gonzalez, B [Oviedo U., Cantabria Inst. of Phys.; Amerio, S [INFN, Padua; Amidei, D [Michigan U.; Anastassov, A [Northwestern U.; Annovi, A [Frascati

2011-10-14T23:59:59.000Z

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they are not comprehensive nor are they the most current set.
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to obtain the most current and comprehensive results.


181

Measurement of the top-quark mass in the lepton+jets channel using a matrix element technique with the CDF II detector  

DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

A measurement of the top-quark mass is presented using Tevatron data from proton-antiproton collisions at center-of-mass energy ?s = 1.96 TeV collected with the CDF II detector. Events are selected from a sample of candidates for production of tt? pairs that decay into the lepton+jets channel. The top-quark mass is measured with an unbinned maximum likelihood method where the event probability density functions are calculated using signal and background matrix elements, as well as a set of parameterized jet-to-parton transfer functions. The likelihood function is maximized with respect to the top-quark mass, the signal fraction in the sample, and a correction to the jet energy scale (JES) calibration of the calorimeter jets. The simultaneous measurement of the JES correction ({Delta}{sub JES}) amounts to an additional in situ jet energy calibration based on the known mass of the hadronically decaying W boson. Using the data sample of 578 lepton+jets candidate events, corresponding to 3.2 fb-1 of integrated luminosity, the top-quark mass is measured to be mt = 172.4 1.4 (stat + ?JES) 1.3 (syst) GeV/c2.

Aaltonen, T [Helsinki Inst. of Phys.; Alvarez Gonzalez, B [Oviedo U., Cantabria Inst. of Phys.; Amerio, S [INFN, Padua; Amidei, D [Michigan U.; Anastassov, A [Northwestern U.; Annovi, A [Frascati

2011-10-14T23:59:59.000Z

182

Possible Lepton Decay Quiz  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Posibles decaimientos del leptón Posibles decaimientos del leptón Cuestionario Volver Principal ESTOY PERDIDO!!! ¿Qué decaimientos de leptón son posibles? ¿Si responde no, diga por qué no? Ayuda: ¿Se conservan la energía, la carga, y número leptónico (electrones, muones, y partículas tau)? Respuesta (presione y mantenga): Si. Se conserva la energía, la carga, el número de electrones y partículas tau. Respuesta (presione y mantenga): No. El número del muones no se conserva. Respuesta (presione y mantenga): No. El número de muones y la carga no se conservan. Respuesta (presione y mantenga): Si. El número de parículas tau, la carga, y la energía se conservan. Respuesta (presione y mantenga): No. La energía no se conserva. La masa de un electrón es menor que la masa de un muón.

183

Analytical eighth-order light-by-light QED contributions from leptons with heavier masses to the anomalous magnetic moment of electron  

Science Journals Connector (OSTI)

The important consequences of the recent results of the numerical evaluations of eighth- and tenth-order QED contributions to the anomalous magnetic moment of electrons are commented upon on this paper. The correctness of the results of the numerical evaluation of the new eighth-order QED corrections to the electron anomaly are supported by the demonstration of their consistency with the presented in this work analytical expressions QED contributions to ae from the diagrams with fourth-order light-by-light scattering muon and tau-lepton loops. The consistency of similar analytical and numerical results is demonstrated in the case of eighth-order mass-dependent contributions to the muons anomalous magnetic moment.

A. L. Kataev

2012-07-16T23:59:59.000Z

184

Evidence for $s$-channel Single-Top-Quark Production in Events with one Charged Lepton and two Jets at CDF  

E-Print Network [OSTI]

We report evidence for $s$-channel single-top-quark production in proton-antiproton collisions at center-of-mass energy $\\sqrt{s}= 1.96 \\mathrm{TeV}$ using a data set that corresponds to an integrated luminosity of $9.4 \\mathrm{fb}^{-1}$ collected by the Collider Detector at Fermilab. We select events consistent with the $s$-channel process including two jets and one leptonically decaying $W$ boson. The observed significance is $3.8$ standard deviations with respect to the background-only prediction. Assuming a top-quark mass of $172.5 \\mathrm{GeV}/c^2$, we measure the $s$-channel cross section to be $1.41^{+0.44}_{-0.42} \\mathrm{pb}$.

CDF Collaboration; T. Aaltonen; S. Amerio; D. Amidei; A. Anastassov; A. Annovi; J. Antos; G. Apollinari; J. A. Appel; T. Arisawa; A. Artikov; J. Asaadi; W. Ashmanskas; B. Auerbach; A. Aurisano; F. Azfar; W. Badgett; T. Bae; A. Barbaro-Galtieri; V. E. Barnes; B. A. Barnett; P. Barria; P. Bartos; M. Bauce; F. Bedeschi; S. Behari; G. Bellettini; J. Bellinger; D. Benjamin; A. Beretvas; A. Bhatti; K. R. Bland; B. Blumenfeld; A. Bocci; A. Bodek; D. Bortoletto; J. Boudreau; A. Boveia; L. Brigliadori; C. Bromberg; E. Brucken; J. Budagov; H. S. Budd; K. Burkett; G. Busetto; P. Bussey; P. Butti; A. Buzatu; A. Calamba; S. Camarda; M. Campanelli; F. Canelli; B. Carls; D. Carlsmith; R. Carosi; S. Carrillo; B. Casal; M. Casarsa; A. Castro; P. Catastini; D. Cauz; V. Cavaliere; M. Cavalli-Sforza; A. Cerri; L. Cerrito; Y. C. Chen; M. Chertok; G. Chiarelli; G. Chlachidze; K. Cho; D. Chokheli; A. Clark; C. Clarke; M. E. Convery; J. Conway; M. Corbo; M. Cordelli; C. A. Cox; D. J. Cox; M. Cremonesi; D. Cruz; J. Cuevas; R. Culbertson; N. d'Ascenzo; M. Datta; P. de Barbaro; L. Demortier; L. Marchese; M. Deninno; F. Devoto; M. D'Errico; A. Di Canto; B. Di Ruzza; J. R. Dittmann; M. D'Onofrio; S. Donati; M. Dorigo; A. Driutti; K. Ebina; R. Edgar; A. Elagin; R. Erbacher; S. Errede; B. Esham; S. Farrington; J. P. Fernndez Ramos; R. Field; G. Flanagan; R. Forrest; M. Franklin; J. C. Freeman; H. Frisch; Y. Funakoshi; C. Galloni; A. F. Garfinkel; P. Garosi; H. Gerberich; E. Gerchtein; S. Giagu; V. Giakoumopoulou; K. Gibson; C. M. Ginsburg; N. Giokaris; P. Giromini; G. Giurgiu; V. Glagolev; D. Glenzinski; M. Gold; D. Goldin; A. Golossanov; G. Gomez; G. Gomez-Ceballos; M. Goncharov; O. Gonzlez Lpez; I. Gorelov; A. T. Goshaw; K. Goulianos; E. Gramellini; S. Grinstein; C. Grosso-Pilcher; R. C. Group; J. Guimaraes da Costa; S. R. Hahn; J. Y. Han; F. Happacher; K. Hara; M. Hare; R. F. Harr; T. Harrington-Taber; K. Hatakeyama; C. Hays; J. Heinrich; M. Herndon; A. Hocker; Z. Hong; W. Hopkins; S. Hou; R. E. Hughes; U. Husemann; M. Hussein; J. Huston; G. Introzzi; M. Iori; A. Ivanov; E. James; D. Jang; B. Jayatilaka; E. J. Jeon; S. Jindariani; M. Jones; K. K. Joo; S. Y. Jun; T. R. Junk; M. Kambeitz; T. Kamon; P. E. Karchin; A. Kasmi; Y. Kato; W. Ketchum; J. Keung; B. Kilminster; D. H. Kim; H. S. Kim; J. E. Kim; M. J. Kim; S. B. Kim; S. H. Kim; Y. K. Kim; Y. J. Kim; N. Kimura; M. Kirby; K. Knoepfel; K. Kondo; D. J. Kong; J. Konigsberg; A. V. Kotwal; M. Kreps; J. Kroll; M. Kruse; T. Kuhr; M. Kurata; A. T. Laasanen; S. Lammel; M. Lancaster; K. Lannon; G. Latino; H. S. Lee; J. S. Lee; S. Leo; S. Leone; J. D. Lewis; A. Limosani; E. Lipeles; A. Lister; H. Liu; Q. Liu; T. Liu; S. Lockwitz; A. Loginov; A. Luc; D. Lucchesi; J. Lueck; P. Lujan; P. Lukens; G. Lungu; J. Lys; R. Lysak; R. Madrak; P. Maestro; S. Malik; G. Manca; A. Manousakis-Katsikakis; F. Margaroli; P. Marino; M. Martnez; K. Matera; M. E. Mattson; A. Mazzacane; P. Mazzanti; R. McNulty; A. Mehta; P. Mehtala; C. Mesropian; T. Miao; D. Mietlicki; A. Mitra; H. Miyake; S. Moed; N. Moggi; C. S. Moon; R. Moore; M. J. Morello; A. Mukherjee; Th. Muller; P. Murat; M. Mussini; J. Nachtman; Y. Nagai; J. Naganoma; I. Nakano; A. Napier; J. Nett; C. Neu; T. Nigmanov; L. Nodulman; S. Y. Noh; O. Norniella; L. Oakes; S. H. Oh; Y. D. Oh; I. Oksuzian; T. Okusawa; R. Orava; L. Ortolan; C. Pagliarone; E. Palencia; P. Palni; V. Papadimitriou; W. Parker; G. Pauletta; M. Paulini; C. Paus; T. J. Phillips; G. Piacentino; E. Pianori; J. Pilot; K. Pitts; C. Plager; L. Pondrom; S. Poprocki; K. Potamianos; F. Prokoshin; A. Pranko; F. Ptohos; G. Punzi; N. Ranjan; I. Redondo Fernndez; P. Renton; M. Rescigno; F. Rimondi; L. Ristori; A. Robson; T. Rodriguez; S. Rolli; M. Ronzani; R. Roser; J. L. Rosner; F. Ruffini; A. Ruiz; J. Russ; V. Rusu; W. K. Sakumoto; Y. Sakurai; L. Santi; K. Sato; V. Saveliev; A. Savoy-Navarro; P. Schlabach; E. E. Schmidt; T. Schwarz; L. Scodellaro; F. Scuri; S. Seidel; Y. Seiya; A. Semenov; F. Sforza; S. Z. Shalhout; T. Shears; P. F. Shepard; M. Shimojima; M. Shochet; I. Shreyber-Tecker; A. Simonenko; K. Sliwa; J. R. Smith; F. D. Snider; V. Sorin; H. Song; M. Stancari; R. St. Denis; D. Stentz; J. Strologas; Y. Sudo; A. Sukhanov; I. Suslov; K. Takemasa; Y. Takeuchi; J. Tang; M. Tecchio; P. K. Teng; J. Thom; E. Thomson; V. Thukral; D. Toback; S. Tokar; K. Tollefson; T. Tomura; D. Tonelli; S. Torre; D. Torretta; P. Totaro; M. Trovato; F. Ukegawa; S. Uozumi; F. Vzquez; G. Velev; C. Vellidis; C. Vernieri; M. Vidal; R. Vilar; J. Vizn; M. Vogel; G. Volpi; P. Wagner; R. Wallny; S. M. Wang; D. Waters; W. C. Wester III; D. Whiteson; A. B. Wicklund; S. Wilbur; H. H. Williams; J. S. Wilson; P. Wilson; B. L. Winer; P. Wittich; S. Wolbers; H. Wolfe; T. Wright; X. Wu; Z. Wu; K. Yamamoto; D. Yamato; T. Yang; U. K. Yang; Y. C. Yang; W. -M. Yao; G. P. Yeh; K. Yi; J. Yoh; K. Yorita; T. Yoshida; G. B. Yu

2014-04-21T23:59:59.000Z

185

A Simultaneous Solution to the ^6Li and ^7Li Big Bang Nucleosynthesis Problems from a Long-Lived Negatively-Charged Leptonic Particle  

E-Print Network [OSTI]

The $^6$Li abundance observed in metal poor halo stars exhibits a plateau similar to that for $^7$Li suggesting a primordial origin. However, the observed abundance of $^6$Li is a factor of $10^3$ larger and that of $^7$Li is a factor of 3 lower than the abundances predicted in the standard big bang when the baryon-to-photon ratio is fixed by WMAP. Here we show that both of these abundance anomalies can be explained by the existence of a long-lived massive, negatively-charged leptonic particle during nucleosynthesis. Such particles would capture onto the synthesized nuclei thereby reducing the reaction Coulomb barriers and opening new transfer reaction possibilities, and catalyzing a second round of big bang nucleosynthesis. This novel solution to both of the Li problems can be achieved with or without the additional effects of stellar destruction.

Motohiko Kusakabe; Toshitaka Kajino; Richard N. Boyd; Takashi Yoshida; Grant J. Mathews

2007-11-24T23:59:59.000Z

186

Search for tt? resonances in the lepton plus jets final state with ATLAS using 4.7??fb-1 of pp collisions at ?s=7??TeV  

DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

A search for new particles that decay into top quark pairs (tt?) is performed with the ATLAS experiment at the LHC using an integrated luminosity of 4.7??fb?1 of protonproton (pp ) collision data collected at a center-of-mass energy ?s =7??TeV . In the tt? ?WbWb decay, the lepton plus jets final state is used, where one W boson decays leptonically and the other hadronically. The tt system is reconstructed using both small-radius and large-radius jets, the latter being supplemented by a jet substructure analysis. A search for local excesses in the number of data events compared to the Standard Model expectation in the tt invariant mass spectrum is performed. No evidence for a tt? resonance is found and 95% credibility-level limits on the production rate are determined for massive states predicted in two benchmark models. The upper limits on the cross section times branching ratio of a narrow Z ? resonance range from 5.1 pb for a boson mass of 0.5 TeV to 0.03 pb for a mass of 3 TeV. A narrow leptophobic topcolor Z ? resonance with a mass below 1.74 TeV is excluded. Limits are also derived for a broad color-octet resonance with ?/m=15.3% . A KaluzaKlein excitation of the gluon in a RandallSundrum model is excluded for masses below 2.07 TeV.

Aad, G.; Abajyan, T.; Abbott, B.; Abdallah, J.; Abdel Khalek, S.; Abdelalim, A. A.; Abdinov, O.; Aben, R.; Abi, B.; Abolins, M.; AbouZeid, O. S.; Abramowicz, H.; Abreu, H.; Abulaiti, Y.; Acharya, B. S.; Adamczyk, L.; Adams, D. L.; Addy, T. N.; Adelman, J.; Adomeit, S.; Adragna, P.; Adye, T.; Aefsky, S.; Aguilar-Saavedra, J. A.; Agustoni, M.; Ahlen, S. P.; Ahles, F.; Ahmad, A.; Ahsan, M.; Aielli, G.; kesson, T. P. A.; Akimoto, G.; Akimov, A. V.; Alam, M. A.; Albert, J.; Albrand, S.; Aleksa, M.; Aleksandrov, I. N.; Alessandria, F.; Alexa, C.; Alexander, G.; Alexandre, G.; Alexopoulos, T.; Alhroob, M.; Aliev, M.; Alimonti, G.; Alison, J.; Allbrooke, B. M. M.; Allison, L. J.; Allport, P. P.; Allwood-Spiers, S. E.; Almond, J.; Aloisio, A.; Alon, R.; Alonso, A.; Alonso, F.; Altheimer, A.; Alvarez Gonzalez, B.; Alviggi, M. G.; Amako, K.; Amelung, C.; Ammosov, V. V.; Amor Dos Santos, S. P.; Amorim, A.; Amoroso, S.; Amram, N.; Anastopoulos, C.; Ancu, L. S.; Andari, N.; Andeen, T.; Anders, C. F.; Anders, G.; Anderson, K. J.; Andreazza, A.; Andrei, V.; Anduaga, X. S.; Angelidakis, S.; Anger, P.; Angerami, A.; Anghinolfi, F.; Anisenkov, A.; Anjos, N.; Annovi, A.; Antonaki, A.; Antonelli, M.; Antonov, A.; Antos, J.; Anulli, F.; Aoki, M.; Aperio Bella, L.; Apolle, R.; Arabidze, G.; Aracena, I.; Arai, Y.; Arce, A. T. H.; Arfaoui, S.; Arguin, J-F.; Argyropoulos, S.; Arik, E.; Arik, M.; Armbruster, A. J.; Arnaez, O.; Arnal, V.; Artamonov, A.; Artoni, G.; Arutinov, D.; Asai, S.; Ask, S.; sman, B.; Asquith, L.; Assamagan, K.; Astalos, R.; Astbury, A.; Atkinson, M.; Auerbach, B.; Auge, E.; Augsten, K.; Aurousseau, M.; Avolio, G.; Axen, D.; Azuelos, G.; Azuma, Y.; Baak, M. A.; Baccaglioni, G.; Bacci, C.; Bach, A. M.; Bachacou, H.; Bachas, K.; Backes, M.; Backhaus, M.; Backus Mayes, J.; Badescu, E.; Bagnaia, P.; Bai, Y.; Bailey, D. C.; Bain, T.; Baines, J. T.; Baker, O. K.; Baker, S.; Balek, P.; Balli, F.; Banas, E.; Banerjee, P.; Banerjee, Sw.; Banfi, D.; Bangert, A.; Bansal, V.; Bansil, H. S.; Barak, L.; Baranov, S. P.; Barber, T.; Barberio, E. L.; Barberis, D.; Barbero, M.; Bardin, D. Y.; Barillari, T.; Barisonzi, M.; Barklow, T.; Barlow, N.; Barnett, B. M.; Barnett, R. M.; Baroncelli, A.; Barone, G.; Barr, A. J.; Barreiro, F.; Barreiro Guimares da Costa, J.; Bartoldus, R.; Barton, A. E.; Bartsch, V.; Basye, A.; Bates, R. L.; Batkova, L.; Batley, J. R.; Battaglia, A.; Battistin, M.; Bauer, F.; Bawa, H. S.; Beale, S.; Beau, T.; Beauchemin, P. H.; Beccherle, R.; Bechtle, P.; Beck, H. P.; Becker, K.; Becker, S.; Beckingham, M.; Becks, K. H.; Beddall, A. J.; Beddall, A.; Bedikian, S.; Bednyakov, V. A.; Bee, C. P.; Beemster, L. J.; Beermann, T. A.; Begel, M.; Behar Harpaz, S.; Belanger-Champagne, C.; Bell, P. J.; Bell, W. H.; Bella, G.; Bellagamba, L.; Bellomo, M.; Belloni, A.; Beloborodova, O.; Belotskiy, K.; Beltramello, O.; Benary, O.; Benchekroun, D.; Bendtz, K.; Benekos, N.; Benhammou, Y.; Benhar Noccioli, E.; Benitez Garcia, J. A.; Benjamin, D. P.; Benoit, M.; Bensinger, J. R.; Benslama, K.; Bentvelsen, S.; Berge, D.; Bergeaas Kuutmann, E.; Berger, N.; Berghaus, F.; Berglund, E.; Beringer, J.; Bernat, P.; Bernhard, R.; Bernius, C.; Bernlochner, F. U.; Berry, T.; Bertella, C.; Bertin, A.; Bertolucci, F.; Besana, M. I.; Besjes, G. J.; Besson, N.; Bethke, S.; Bhimji, W.; Bianchi, R. M.; Bianchini, L.; Bianco, M.; Biebel, O.; Bieniek, S. P.; Bierwagen, K.; Biesiada, J.; Biglietti, M.; Bilokon, H.; Bindi, M.; Binet, S.; Bingul, A.; Bini, C.; Biscarat, C.; Bittner, B.; Black, C. W.; Black, J. E.; Black, K. M.; Blair, R. E.; Blanchard, J.-B.; Blazek, T.; Bloch, I.; Blocker, C.; Blocki, J.; Blum, W.; Blumenschein, U.; Bobbink, G. J.; Bobrovnikov, V. S.; Bocchetta, S. S.; Bocci, A.; Boddy, C. R.; Boehler, M.; Boek, J.; Boek, T. T.; Boelaert, N.; Bogaerts, J. A.; Bogdanchikov, A.; Bogouch, A.; Bohm, C.; Bohm, J.; Boisvert, V.; Bold, T.; Boldea, V.; Bolnet, N. M.; Bomben, M.; Bona, M.; Boonekamp, M.; Bordoni, S.; Borer, C.; Borisov, A.; Borissov, G.; Borjanovic, I.; Borri, M.; Borroni, S.; Bortfeldt, J.; Bortolotto, V.; Bos, K.; Boscherini, D.; Bosman, M.; Boterenbrood, H.; Bouchami, J.; Boudreau, J.; Bouhova-Thacker, E. V.; Boumediene, D.; Bourdarios, C.; Bousson, N.; Boutouil, S.; Boveia, A.; Boyd, J.; Boyko, I. R.; Bozovic-Jelisavcic, I.; Bracinik, J.; Branchini, P.; Brandt, A.; Brandt, G.; Brandt, O.; Bratzler, U.; Brau, B.; Brau, J. E.; Braun, H. M.; Brazzale, S. F.; Brelier, B.; Bremer, J.; Brendlinger, K.; Brenner, R.; Bressler, S.; Bristow, T. M.; Britton, D.; Brochu, F. M.; Brock, I.; Brock, R.; Broggi, F.; Bromberg, C.; Bronner, J.; Brooijmans, G.; Brooks, T.; Brooks, W. K.; Brown, G.; Bruckman de Renstrom, P. A.; Bruncko, D.; Bruneliere, R.; Brunet, S.; Bruni, A.; Bruni, G.; Bruschi, M.; Bryngemark, L.

2013-07-01T23:59:59.000Z

187

Measurement of the production and lepton charge asymmetry of $\\textit{W}$ bosons in Pb+Pb collisions at $\\sqrt{s_{\\mathrm{\\mathbf{NN}}}}=$ 2.76 TeV with the ATLAS detector  

E-Print Network [OSTI]

A measurement of $\\textit{W}$ boson production in lead-lead collisions at $\\sqrt{s_{\\mathrm{NN}}}=$2.76 TeV is presented. It is based on the analysis of data collected with the ATLAS detector at the LHC in 2011 corresponding to an integrated luminosity of 0.14 $\\mathrm{nb}^{-1}$ and 0.15 $\\mathrm{nb}^{-1}$ in the muon and electron decay channels, respectively. The differential production yields and lepton charge asymmetry are each measured as a function of the average number of participating nucleons $$ and absolute pseudorapidity of the charged lepton. The results are compared to predictions based on next-to-leading-order QCD calculations. These measurements are, in principle, sensitive to possible nuclear modifications to the parton distribution functions and also provide information on scaling of $\\textit{W}$ boson production in multi-nucleon systems.

ATLAS Collaboration

2015-01-26T23:59:59.000Z

188

Measurement of the Top Quark Mass at D0 Run II with the Matrix Element Method in the Lepton+Jets Final State  

SciTech Connect (OSTI)

The mass of the top quark is a fundamental parameter of the Standard Model. Its precise knowledge yields valuable insights into unresolved phenomena in and beyond the Standard Model. A measurement of the top quark mass with the matrix element method in the lepton+jets final state in D0 Run II is presented. Events are selected requiring an isolated energetic charged lepton (electron or muon), significant missing transverse energy, and exactly four calorimeter jets. For each event, the probabilities to originate from the signal and background processes are calculated based on the measured kinematics, the object resolutions and the respective matrix elements. The jet energy scale is known to be the dominant source of systematic uncertainty. The reference scale for the mass measurement is derived from Monte Carlo events. The matrix element likelihood is defined as a function of both, m{sub top} and jet energy scale JES, where the latter represents a scale factor with respect to the reference scale. The top mass is obtained from a two-dimensional correlated fit, and the likelihood yields both the statistical and jet energy scale uncertainty. Using a dataset of 320 pb{sup -1} of D0 Run II data, the mass of the top quark is measured to be: m{sub top}{sup {ell}+jets} = 169.5 {+-} 4.4(stat. + JES){sub -1.6}{sup +1.7}(syst.) GeV; m{sub top}{sup e+jets} = 168.8 {+-} 6.0(stat. + JES){sub -1.9}{sup +1.9}(syst.) GeV; m{sub top}{sup {mu}+jets} = 172.3 {+-} 9.6(stat.+JES){sub -3.3}{sup +3.4}(syst.) GeV. The jet energy scale measurement in the {ell}+jets sample yields JES = 1.034 {+-} 0.034, suggesting good consistency of the data with the simulation. The measurement forecasts significant improvements to the total top mass uncertainty during Run II before the startup of the LHC, as the data sample will grow by a factor of ten and D0's tracking capabilities will be employed in jet energy reconstruction and flavor identification.

Schieferdecker, Philipp; /Munich U.; ,

2005-08-01T23:59:59.000Z

189

Searching the Inclusive Lepton + Photon + Missing E(T) + b-quark Signature for Radiative Top Quark Decay and Non-Standard-Model Processes  

SciTech Connect (OSTI)

In a search for new phenomena in a signature suppressed in the standard model of elementary particles (SM), we compare the inclusive production of events containing a lepton ({ell}), a photon ({gamma}), significant transverse momentum imbalance (E{sub T}), and a jet identified as containing a b-quark, to SM predictions. The search uses data produced in proton-antiproton collisions at {radical}s = 1.96 TeV corresponding to 1.9 fb{sup -1} of integrated luminosity taken with the CDF detector at the Fermilab Tevatron. We find 28 {ell}{gamma}bE{sub T} events versus an expectation of 31.0{sub -3.5}{sup +4.1} events. If we further require events to contain at least three jets and large total transverse energy, simulations predict that the largest SM source is top-quark pair production with an additional radiated photon, t{bar t} + {gamma}. In the data we observe 16 t{bar t}{gamma} candidate events versus an expectation from non-top-quark SM sources of 11.2{sub -2.1}{sup +2.3}. Assuming the difference between the observed number and the predicted non-top-quark total is due to SM top quark production, we estimate the t{bar t} cross section to be 0.15 {+-} 0.08 pb.

Aaltonen, T.; /Helsinki Inst. of Phys.; Adelman, Jahred A.; /Chicago U., EFI; Akimoto, T.; /Tsukuba U.; Alvarez Gonzalez, B.; /Cantabria Inst. of Phys.; Amerio, S.; /INFN, Padua; Amidei, Dante E.; /Michigan U.; Anastassov, A.; /Northwestern U.; Annovi, Alberto; /Frascati; Antos, Jaroslav; /Comenius U.; Apollinari, G.; /Fermilab; Apresyan, A.; /Purdue U. /Waseda U.

2009-06-01T23:59:59.000Z

190

Modelling of the Spectral Energy Distribution of Fornax A: Leptonic and Hadronic Production of High Energy Emission from the Radio Lobes  

E-Print Network [OSTI]

We present new low-frequency observations of the nearby radio galaxy Fornax A at 154 MHz with the Murchison Widefield Array, microwave flux-density measurements obtained from WMAP and Planck data, and gamma-ray flux densities obtained from Fermi data. We also compile a comprehensive list of previously published images and flux-density measurements at radio, microwave and X-ray energies. A detailed analysis of the spectrum of Fornax A between 154 MHz and 1510 MHz reveals that both radio lobes have a similar spatially-averaged spectral index, and that there exists a steep-spectrum bridge of diffuse emission between the lobes. Taking the spectral index of both lobes to be the same, we model the spectral energy distribution of Fornax A across an energy range spanning eighteen orders of magnitude, to investigate the origin of the X-ray and gamma-ray emission. A standard leptonic model for the production of both the X-rays and gamma-rays by inverse-Compton scattering does not fit the multi-wavelength observations. ...

McKinley, B; Lpez-Caniego, M; Briggs, F; Hurley-Walker, N; Wayth, R B; Offringa, A R; Crocker, R; Bernardi, G; Procopio, P; Gaensler, B M; Tingay, S J; Johnston-Hollitt, M; McDonald, M; Bell, M; Bhat, N D R; Bowman, J D; Cappallo, R J; Corey, B E; Deshpande, A A; Emrich, D; Ewall-Wice, A; Feng, L; Goeke, R; Greenhill, L J; Hazelton, B J; Hewitt, J N; Hindson, L; Jacobs, D; Kaplan, D L; Kasper, J C; Kratzenberg, E; Kudryavtseva, N; Lenc, E; Lonsdale, C J; Lynch, M J; McWhirter, S R; Mitchell, D A; Morales, M F; Morgan, E; Oberoi, D; Ord, S M; Pindor, B; Prabu, T; Riding, J; Rogers, A E E; Roshi, D A; Shankar, N Udaya; Srivani, K S; Subrahmanyan, R; Waterson, M; Webster, R L; Whitney, A R; Williams, A; Williams, C L

2014-01-01T23:59:59.000Z

191

A search for the production of Direct Leptons in nucleon-nucleus and nucleus-nucleus collisions. Progress report, April 1, 1991--December 1, 1993  

SciTech Connect (OSTI)

The purpose of this report is to describe activities performed by the Intermediate Energy Nuclear Physics Group (IENPG) at the Louisiana State University (LSU) under the terms of grant FG05-88ER40445. The report will cover, for the most part, the period of time between April 1, 1991, and the present. The principal focus of our activities is currently the muon subgroup of the PHENIX Collaboration. We are, however, in the process of concluding other activities, specifically our memberships in the Di-Lepton Spectrometer (DLS) Collaboration at LBL and the AMY Collaboration at KEK. These activities have been thoroughly discussed in previous progress reports and renewal proposals, and further discussion of these activities is possibly repetitious. However, this report has been prepared under the assumption that none of the referees with the exception of the grant monitor is familiar with the group or its previous work. Consequently we shall cite a few examples of our contributions to these collaborations when there seem to be valid reasons for so doing.

Kirk, P.N.

1993-12-15T23:59:59.000Z

192

Structure Functions in Deep Inelastic Lepton Scattering: Data from DOE laboratory experiments as compiled in data reviews by the Durham High Energy Physics Database Group  

DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

Gehrmann, Roberts, and Whalley in their 1999 paper, A Compilation of Structure Functions in Deep Inelastic Scattering, published in volume 25 of Journal of Physics G (Nuclear and Particle Physics) note that these data will continue to be relevant to the next generation of hadron colliders. They present data on the unpolarized structure functions F2 and xF3, R D ._L=_T /, the virtual photon asymmetries A1 and A2 and the polarized structure functions g1 and g2, from deep inelastic lepton scattering off protons, deuterium and nuclei. Data are presented in both tabular and graphical format and include predictions based on the MRST98 and CTEQ4 parton distribution functions as well. The data gathered from the relevant collaborations at DOE's Fermilab, SLAC, and JLAB are available, and so are data from related collaborations based at CERN and DESY. The Durham High Energy Physics (HEP) Database Group makes these data, extracted from papers and data reviews, available in one place in an easy-to-access format. These data are also include in the Durham HEP Reaction Data Database which can be searched at http://hepdata.cedar.ac.uk/reaction

Gehrmann, T; Roberts, R.G.; Whalley, M.R.; Durham HEP Database Group

193

Measurements of the Higgs boson mass and width in the four-lepton final state and electron reconstruction in the CMS experiment at the LHC  

E-Print Network [OSTI]

This thesis document reports measurements of the mass and width of the new boson re- cently discovered at the Large Hadron Collider (LHC), candidating to be the Standard Model Higgs boson. The analysis uses proton-proton collision data recorded by the Compact Muon Solenoid (CMS) detector at the LHC, corresponding to integrated luminosities of $5.1~fb^{?1}$ at $7~$TeV center of mass energy and $19.7~fb^{?1}$ at $8~$TeV center of mass energy. Set of events selecting Higgs boson via the $H\\to ZZ$ decay channel, where both $Z$ bosons decay to electron or muon lepton pairs, is used for the Higgs boson properties measurements. A precise measurement of its mass has been performed and gives $125.6\\pm0.4\\mbox{(stat)}\\pm0.2\\mbox{(syst)}~$GeV. Constraints on the Higgs boson width were established using its off-shell production and decay to a pair of $Z$ bosons, where one $Z$ boson decays to an electron or muon pair, and the other to an electron, muon, or neutrino pair. The obtained result is an upper limit on the Hi...

Dalchenko, Mykhailo; Charlot, Claude

194

Symmetries of Quarks and Leptons  

Science Journals Connector (OSTI)

The course is divided in four Chapters corresponding to three lectures. After an introductory first chapter, the second deals with the symmetries of strong interactions from a quark point of view. We shall dis...

F. Grsey

1979-01-01T23:59:59.000Z

195

Physics with Leptons in ATLAS  

Science Journals Connector (OSTI)

......are an important decay mode for a Higgs boson with a mass range Higgs boson. Extending to MSSM, two Higgs...exclu- sion limits for charged Higgs boson pro- duction from top quark decays......

Saminder Dhaliwal

2012-03-01T23:59:59.000Z

196

Search for the production of ZW and ZZ boson pairs decaying into charged leptons and jets in proton-antiproton collisions at sqrt[s]=1.96 TeV  

SciTech Connect (OSTI)

We present a measurement of the production cross section for ZW and ZZ boson pairs in final states with a pair of charged leptons, from the decay of a Z boson, and at least two jets, from the decay of a W or Z boson, using the full sample of proton-antiproton collisions recorded with the CDF II detector at the Tevatron, corresponding to 8.9 fb^(-1) of integrated luminosity. We increase the sensitivity to vector boson decays into pairs of quarks using a neural network discriminant that exploits the differences between the spatial spread of energy depositions and charged-particle momenta contained within the jet of particles originating from quarks and gluons. Additionally, we employ new jet energy corrections to Monte Carlo simulations that account for differences in the observed energy scales for quark and gluon jets. The number of signal events is extracted through a simultaneous fit to the dijet mass spectrum in three classes of events: events likely to contain jets with a heavy-quark decay, events likely to contain jets originating from light quarks, and events that fail these identification criteria. We determine the production cross section to be 2.5 +2.0 -1.0 pb (< 6.1 pb at the 95% confidence level), consistent with the standard model prediction of 5.1 pb.

Aaltonen, Timo Antero; et al,

2013-11-13T23:59:59.000Z

197

Measurement of the top quark mass with the dynamical likelihood method using lepton plus jets events with b-tags in pp collisions at s=1.96??TeV  

Science Journals Connector (OSTI)

This paper describes a measurement of the top quark mass, Mtop, with the dynamical likelihood method (DLM) using the CDF II detector at the Fermilab Tevatron. The Tevatron produces top/antitop (tt) pairs in pp collisions at a center-of-mass energy of 1.96TeV. The data sample used in this analysis was accumulated from March 2002 through August 2004, which corresponds to an integrated luminosity of 318??pb-1. We use the tt candidates in the lepton+jets decay channel, requiring at least one jet identified as a b quark by finding a displaced secondary vertex. The DLM defines a likelihood for each event based on the differential cross section as a function of Mtop per unit phase space volume of the final partons, multiplied by the transfer functions from jet to parton energies. The method takes into account all possible jet combinations in an event, and the likelihood is multiplied event by event to derive the top quark mass by the maximum likelihood method. Using 63 tt candidates observed in the data, with 9.2 events expected from background, we measure the top quark mass to be 173.2+2.6-2.4(stat.)3.2(syst.)??GeV/c2, or 173.2+4.1-4.0??GeV/c2.

A. Abulencia et al. (CDF Collaboration)

2006-05-10T23:59:59.000Z

198

Measurement of the Top Quark Mass with the Dynamical Likelihood Method using Lepton plus Jets Events with b-tags in ppbar Collisions at s**(1/2) = 1.96 TeV  

E-Print Network [OSTI]

This report describes a measurement of the top quark mass, M_{top}, with the dynamical likelihood method (DLM) using the CDF II detector at the Fermilab Tevatron. The Tevatron produces top/anti-top pairs in protons and anti-protons collisions at a center-of-mass energy of 1.96 TeV. The data sample used in this analysis was accumulated from March 2002 through August 2004, which corresponds to an integrated luminosity of 318 pb^{-1}. We use the top/anti-top candidates in the ``lepton+jets'' decay channel, requiring at least one jet identified as a b quark by finding a displaced secondary vertex. The DLM defines a likelihood for each event based on the differential cross section as a function of M_{top} per unit phase space volume of the final partons, multiplied by the transfer functions from jet to parton energies. The method takes into account all possible jet combinations in an event, and the likelihood is multiplied event by event to derive the top quark mass by the maximum likelihood method. Using 63 top quark candidates observed in the data, with 9.2 events expected from background, we measure the top quark mass to be 173.2 +2.6/-2.4 (stat.) +/- 3.2 (syst.) GeV/c^2, or 173.2 +4.1/-4.0 GeV/c^2.

CDF Collaboration

2005-12-05T23:59:59.000Z

199

Search for WW and WZ production in lepton, neutrino plus jets final states at CDF Run II and Silicon module production and detector control system for the ATLAS SemiConductor Tracker  

SciTech Connect (OSTI)

In the first part of this work, we present a search for WW and WZ production in charged lepton, neutrino plus jets final states produced in p{bar p} collisions with {radical}s = 1.96 TeV at the Fermilab Tevatron, using 1.2 fb{sup -1} of data accumulated with the CDF II detector. This channel is yet to be observed in hadron colliders due to the large singleWplus jets background. However, this decay mode has a much larger branching fraction than the cleaner fully leptonic mode making it more sensitive to anomalous triple gauge couplings that manifest themselves at higher transverse W momentum. Because the final state is topologically similar to associated production of a Higgs boson with a W, the techniques developed in this analysis are also applicable in that search. An Artificial Neural Network has been used for the event selection optimization. The theoretical prediction for the cross section is {sigma}{sub WW/WZ}{sup theory} x Br(W {yields} {ell}{nu}; W/Z {yields} jj) = 2.09 {+-} 0.14 pb. They measured N{sub Signal} = 410 {+-} 212(stat) {+-} 102(sys) signal events that correspond to a cross section {sigma}{sub WW/WZ} x Br(W {yields} {ell}{nu}; W/Z {yields} jj) = 1.47 {+-} 0.77(stat) {+-} 0.38(sys) pb. The 95% CL upper limit to the cross section is estimated to be {sigma} x Br(W {yields} {ell}{nu}; W/Z {yields} jj) < 2.88 pb. The second part of the present work is technical and concerns the ATLAS SemiConductor Tracker (SCT) assembly phase. Although technical, the work in the SCT assembly phase is of prime importance for the good performance of the detector during data taking. The production at the University of Geneva of approximately one third of the silicon microstrip end-cap modules is presented. This collaborative effort of the university of Geneva group that lasted two years, resulted in 655 produced modules, 97% of which were good modules, constructed within the mechanical and electrical specifications and delivered in the SCT collaboration for assembly on the end-cap disks. The SCT end-caps and barrels consist of 4088 silicon modules, with a total of 6.3 million readout channels. The coherent and safe operation of the SCT during commissioning and subsequent operation is the essential task of the Detector Control System (DCS). The main building blocks of the DCS are the cooling system, the power supplies and the environmental system. The DCS has been initially developed for the SCT assembly phase and this system is described in the present work. Particular emphasis is given in the environmental hardware and software components, that were my major contributions. Results from the DCS testing during the assembly phase are also reported.

Sfyrla, Anna; /Geneva U.

2008-03-01T23:59:59.000Z

200

Supersymmetric Dark Matter and Lepton Flavor Violation  

E-Print Network [OSTI]

.11) by introducing anti-commuting spinorial chargesQa (a = 1...N): [P,Qa] = 0, (1.12) [M?,Qa] = ?(??)abQb, (1.13) {Qa, Qb} = 2(?)abP (1.14) {Qa,Qb} = ?2(?C)abP, (1.15) {Qa, Qb} = 2(C?1?)abP, (1.16) whereA,B ?AB+BA. The resulting algebra is not a Lie...)M+ 1 2( ??)N + 1 2( ??5??)V + i(??5?) bracketleftbigg ? parenleftbigg ?+ i?2?/? parenrightbiggbracketrightbigg ? 14(??5?)2 bracketleftbigg D? 12squareS bracketrightbigg . (1.19) We have arranged the expansion terms into a vector fieldV, two...

Soleimani, Ali

2010-05-07T23:59:59.000Z

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201

Phenomenology of lepton-nucleus DIS  

E-Print Network [OSTI]

The results of recent phenomenological studies of unpolarized nuclear deep-inelastic scattering are discussed and applied to calculate neutrino charged-current structure functions and cross sections for a number of nuclei.

S. A. Kulagin; R. Petti

2006-02-10T23:59:59.000Z

202

Search for ? mesons in ? lepton decay  

E-Print Network [OSTI]

f b21 of data collected with the CLEO II detector. We find model-dependent upper limits on the branching fractions in the range B(t2!fp2n t ),(1.222.0)31024 and B(t2!fK2n t ),(5.426.7)31025 at 90% confidence level. @S0556-2821~97!50603-5# PACS number...~s!: 13.35.Dx, 12.39.2x, 12.40.Vv, 14.40.Cs I. INTRODUCTION A measurement of the decay t2!fp2n t @1# is of inter- est as it may provide clues to the workings of QCD at the 1 GeV/c2 mass scale. This decay mode may serve @2# as a valuable source...

Baringer, Philip S.

1997-02-01T23:59:59.000Z

203

What lepton pairs reveal about pions in the nuclear medium  

Science Journals Connector (OSTI)

We calculate the pion spectrum and its electromagnetic annihilation vertex in nuclear matter taking into account the strong ?N? interaction. For nuclear densities the pion kinetic energy is approximately compensated by the interaction, but also the free-pion annihilation matrix element is almost canceled by the contribution from the interaction with the medium. Consequently, the enhancement of the dilepton production rate due to the softening of the pion spectrum is strongly reduced.

C. L. Korpa and Scott Pratt

1990-03-26T23:59:59.000Z

204

Radiative proton-antiproton annihilation to a lepton pair  

SciTech Connect (OSTI)

The annihilation of proton and antiproton to an electron-positron pair, including radiative corrections due to the emission of virtual and real photons is considered. The results are generalized to leading and next-to leading approximations. The relevant distributions are derived and numerical applications are given in the kinematical range accessible to the PANDA experiment at the FAIR facility.

Ahmadov, A. I. [Joint Institute for Nuclear Research, Dubna (Russian Federation); Institute of Physics, Azerbaijan National Academy of Sciences, Baku (Azerbaijan); Bytev, V. V.; Kuraev, E. A. [Joint Institute for Nuclear Research, Dubna (Russian Federation); Tomasi-Gustafsson, E. [CEA, IRFU, SPhN, Saclay, 91191 Gif-sur-Yvette Cedex, France, and CNRS/IN2P3, Institut de Physique Nucleaire, UMR 8608, 91405 Orsay (France)

2010-11-01T23:59:59.000Z

205

A_N in inclusive lepton-proton collisions  

SciTech Connect (OSTI)

Some estimates for the transverse single spin asymmetry, A_N, in the inclusive processes l p(transv. Pol.) -> h X are compared with new experimental data. The calculations are based on the Sivers and Collins functions as extracted from SIDIS azimuthal asymmetries, within a transverse momentum dependent factorization approach. The values of A_N thus obtained agree in sign and shape with the data. Predictions for future experiments are also given.

Prokudin, Alexey; Anselmino, Mauro; Boglione, Mariaelena; D'Alesio, Umberto; Melis, Stefano; Murgia, Francesco

2014-11-01T23:59:59.000Z

206

Leptonic CP violation in the supersymmetric standard model  

Science Journals Connector (OSTI)

We point out the possibility of spontaneous and hard CP violation in the scalar potential of the R-parity broken supersymmetric standard model. The existence of spontaneous CP violation depends crucially on the R-parity-breaking terms in the superpotential and, in addition, on the choice of the soft supersymmetry-breaking terms. Unlike in theories with R-parity conservation, it is natural, in the context of the present model, for the sneutrinos to acquire (complex) vacuum expectation values. In the context of this model we examine here the global implications, such as the strength of the CP-violating interactions and the neutrino masses.

Anjan S. Joshipura and Marek Nowakowski

1995-05-01T23:59:59.000Z

207

Yukawa Meson, Sakata Model and Baryon-Lepton Symmetry Revisited  

Science Journals Connector (OSTI)

......understand the nature of two new forces - the nuclear and the...1960 Rochester Conf. on High Energy Physics. New York: Interscience. 843. This...1960 Rochester Con! on High Energy Physics Onterscience, New York), p. 843. This talk was......

Robert E. Marshak

1985-05-01T23:59:59.000Z

208

Measurement of the B semileptonic branching fraction with lepton tags  

E-Print Network [OSTI]

We have used the CLEO II detector and 2.06 fb(-1) of Y(4S) data to measure the B-meson semileptonic branching fraction. The B --> Xe nu momentum spectrum was obtained over nearly the full momentum range by using charge and kinematic correlations...

Ammar, Raymond G.; Baringer, Philip S.; Bean, Alice; Besson, David Zeke; Coppage, Don; Copty, N.; Davis, Robin E. P.; Hancock, N.; Kotov, S.; Kravchenko, I.; Kwak, Nowhan

1996-03-01T23:59:59.000Z

209

Measuring Leptonic CP Violation by Low Energy Neutrino Oscillation Experiments  

E-Print Network [OSTI]

We uncover an interesting phenomenon that neutrino flavor transformation in slowly varying matter density imitates almost exactly that of vacuum neutrino oscillation under suitably chosen experimental parameters. It allows us to have relatively large CP violating measure \\Delta P \\equiv P(\

Hisakazu Minakata; Hiroshi Nunokawa

2000-04-12T23:59:59.000Z

210

Electromagnetic Field Creation During EWPT Nucleation With Lepton Currents  

E-Print Network [OSTI]

We include the electromagnetic currents from fermion degrees of freedom in the equations of motion for electroweak MSSM with a right-handed Stop that we have recently investigated. It is found that near the surface of the bubble walls there are important effects on the electromagnetic fields produced during bubble nucleation.

Leonard S. Kisslinger; Sameer Walawalkar; Ernest M. Henley; Mikkel B. Johnson

2005-10-11T23:59:59.000Z

211

Search for neutrinoless decays of the tau lepton  

E-Print Network [OSTI]

. The upper limits obtained for 22 decay branching fractions are several times more stringent than those set previously....

Ammar, Raymond G.; Ball, S.; Baringer, Philip S.; Bean, Alice; Besson, David Zeke; Coppage, Don; Copty, N.; Davis, Robin E. P.; Hancock, N.; Kelly, M.; Kotov, S.; Kravchenko, I.; Kwak, Nowhan; Lam, H.

1994-10-01T23:59:59.000Z

212

Neutrino mass, lepton number, and the origin of matter  

E-Print Network [OSTI]

antiparticles? And many other things% Do neutrinos violate CP? #12;Neutrinoless Double Beta Decay W. Rodejohann? #12;Neutrinoless Double Beta Decay 1 sigma W. Rodejohann, 1206.2560 #12;14 F. Iachello #12;15 Regions

213

Radiative corrections to lepton-lepton scattering Physik-Department T39, Technische Universitat Munchen, D-85747 Garching, Germany  

E-Print Network [OSTI]

the tree diagrams and the one-loop diagrams. Infrared finiteness of these virtual radiative corrections is achieved (in the standard way) by including soft photon radiation below an energy cut-off . We evaluate discrepancies for the ratio of the proton electric and magnetic form factors Gp E/Gp M as determined

Weise, Wolfram

214

The Mu2e Experiment at Fermilab: a Search for Charged Lepton Flavor Violation  

E-Print Network [OSTI]

A experiment, low energy negative muons are stopped in a thin aluminum target and are captured of a nucleus occurs coherently, resulting in a monoenergetic electron near the muon rest energy energy from muon decays. There are several new features being implemented that will lead

215

t-tbar cross-section at Tevatron Lepton + jets channel  

E-Print Network [OSTI]

energy resolution: ­ Muons are of two types: ­ CMX ­ eta = 0.6..1.0 ­ CMUP ­ eta microns #12;II-b/c. Calorimetry and muons Outside of the tracker and solenoid Eta : isolated EM clusters in CEM matching XFT track ­ Jets use cone: 0.4 Standard jet energy corrections Jet

216

Measurement of the top quark mass in the lepton+jets channel using the ideogram method  

E-Print Network [OSTI]

in the overall likelihood fit. This paper is organized as follows: Sections II and III describe the D0 Run II detector and the event reconstruc- tion, respectively. Sections IV, V, and VI describe the data and simulation samples used and outline the event selec... in Sec. IX and the systematic uncertainties are discussed in Sec. X. Section XI presents a cross-check of the JES calibration, followed by the con- clusion in Sec. XII. II. THE D0 DETECTOR Run II of the Fermilab Tevatron collider started in 2001 after...

Baringer, Philip S.; Bean, Alice; Hensel, Carsten; Moulik, Tania; Wilson, Graham Wallace; Abazov, V. M.; Abbott, B.; Abolins, M.; Acharya, B. S.; Adams, M.

2007-05-11T23:59:59.000Z

217

Observation and examination of a Higgs boson in the ZZ to four lepton channel  

E-Print Network [OSTI]

Results are presented on 5.1 fb- 1 of proton-proton collisions at a center of mass energy of 7 TeV and 19.7 fb- 1 at 8 TeV in a search for decays of the Standard Model (SM) Higgs boson to two Z bosons to four charged ...

Ralph, Duncan (Duncan Kelley)

2014-01-01T23:59:59.000Z

218

Measurement of the properties of a Higgs boson in the four-lepton final state  

E-Print Network [OSTI]

The properties of a Higgs boson candidate are measured in the H ? ZZ ? 4? decay channel, with ? = e, ?, using data from pp collisions corresponding to an integrated luminosity of 5.1??fb[superscript ?1] at the center-of-mass ...

Apyan, Aram

219

Search for the Standard Model Higgs boson in the fully leptonic WW decay channel at CMS.  

E-Print Network [OSTI]

??A search for the Standard Model Higgs boson decaying to W?W? is presented. Data is taken from pp collisions with center of mass energy sqrt(s) (more)

LeBourgeois, Matthew

2012-01-01T23:59:59.000Z

220

COMMISSIONING OF ATLAS AND EARLY MEASUREMENTS WITH LEPTONS IN ATLAS AND CMS  

E-Print Network [OSTI]

at start-up The endwall muon chambers are the last components to be installed in the cavern (June 2008 performed. Once in the cavern, the noise levels were the same as those measured on the surface. The global went down into the cavern beginning in 2006 and have been operating under stable conditions for a long

Paris-Sud XI, Université de

Note: This page contains sample records for the topic "leptons leptons leptons" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
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to obtain the most current and comprehensive results.


221

On the Energy Spectra of GeV/TeV Cosmic Ray Leptons  

SciTech Connect (OSTI)

Recent observations of cosmic ray electrons from several instruments have revealed various degrees of deviation in the measured electron energy distribution from a simple power-law, in a form of an excess around 0.1 to 1 TeV energies. An even more prominent deviation and excess has been observed in the fraction of cosmic ray positrons around 10 and 100 GeV energies. These observations have received considerable attention and many theoretical models have been proposed to explain them. The models rely on either dark matter annihilation/decay or specific nearby astrophysical sources, and involve several additional assumptions regarding the dark matter distribution or particle acceleration. In this paper we show that the observed excesses in the electron spectrum may be easily reproduced without invoking any unusual sources other than the general diffuse Galactic components of cosmic rays. The model presented here assumes a power-law injection of electrons (and protons) by supernova remnants, and evaluates their expected energy spectrum based on a simple kinetic equation describing the propagation of charged particles in the interstellar medium. The primary physical effect involved is the Klein-Nishina suppression of the electron cooling rate around TeV energies. With a very reasonable choice of the model parameters characterizing the local interstellar medium, we can reproduce the most recent observations by Fermi and HESS experiments. Interestingly, in our model the injection spectral index of cosmic ray electrons becomes comparable to, or even equal to that of cosmic ray protons. The Klein-Nishina effect may also affect the propagation of the secondary e{sup {+-}} pairs, and therefore modify the cosmic ray positron-to-electron ratio. We have explored this possibility by considering two mechanisms for production of e{sup {+-}} pairs within the Galaxy. The first is due to the decay of {pi}{sup {+-}}'s produced by interaction of cosmic ray nuclei with ambient protons. The second source discussed here is due to the annihilation of the diffuse Galactic {gamma}-rays on the stellar photon field. We find that high positron fraction increasing with energy, as claimed by the PAMELA experiment, cannot be explained in our model with the conservative set of the model parameters. We are able, however, to reproduce the PAMELA (as well as Fermi and HESS) results assuming high values of the starlight and interstellar gas densities, which would be more appropriate for vicinities of supernova remnants. A possible solution to this problem may be that cosmic rays undergo most of their interactions near their sources due to the efficient trapping in the far upstream of supernova shocks by self-generated, cosmic ray-driven turbulence.

Stawarz, Lukasz; /KIPAC, Menlo Park /Jagiellonian U., Astron. Observ.; Petrosian, Vahe; /KIPAC, Menlo Park /Stanford U., Phys. Dept. /Stanford U., Appl. Phys. Dept.; Blandford, Roger D.; /KIPAC, Menlo Park

2011-08-19T23:59:59.000Z

222

Higher-dimensional effective-potential model of quarks and leptons  

E-Print Network [OSTI]

calculations will give (Z)V g Oz O'SQ?- (Z)dSZ =COnStant gs WS?(Z) 6-a (g~ r C~i(S, ) (3. 25) (z) 7 g'Bs Q?- (z) d 8 = constant ~ g'ssB?(z) 6~6. f (3. 26) Substituting Eqs. (3. 22) and (3. 24) into Eq. (3. 18) we obtain s&=+) (-t Z+~a)~"', (z) = - -g. v.... , that the weak hypercharge Y be determined from the following formula: 1 Q = ls+ -1' 2 (1. 2) Using the notation of Eq. (1. 1) and determining Y from Eq. (1. 2), we can write the invariant Lagrangian of the standard model prior to spontaneous symmetry...

Wirjawan, Johannes Vincentius Djoko

2012-06-07T23:59:59.000Z

223

Global analysis of neutrino masses, mixings, and phases: Entering the era of leptonic CP violation searches  

Science Journals Connector (OSTI)

We perform a global analysis of neutrino oscillation data, including high-precision measurements of the neutrino mixing angle ?13 at reactor experiments, which have confirmed previous indications in favor of ?13>0. Recent data presented at the Neutrino 2012 conference are also included. We focus on the correlations between ?13 and the mixing angle ?23, as well as between ?13 and the neutrino CP-violation phase ?. We find interesting indications for ?23

G. L. Fogli; E. Lisi; A. Marrone; D. Montanino; A. Palazzo; A. M. Rotunno

2012-07-23T23:59:59.000Z

224

Extended Parameterisations for MSTW PDFs and their effect on Lepton Charge Asymmetry from W Decays  

E-Print Network [OSTI]

We investigate the effect of extending the standard MSTW parameterisation of input parton distribution functions (PDFs) using Chebyshev polynomials. We find evidence that, at most, four powers in the polynomial are sufficient for extremely high precision. Applying this to valence and sea quarks we find an improvement in the global fit, but a significant change only in the small-$x$ valence up-quark PDF, $u_V$. We investigate the effect of also extending, and making more flexible, the `nuclear' correction to deuteron structure functions. The extended `Chebyshev' parameterisation results in an improved stability in the deuteron corrections that are required for the best fit to the `global' data. The resulting PDFs have a significantly, but not dramatically, altered valence down-quark distribution, $d_V$. For the extended set of MSTW PDFs, their uncertainties can be obtained using 23, rather than the usual 20, orthogonal `uncertainty' eigenvectors. Since the dominant effect is on the valence quarks, we present a...

Martin, A D; Stirling, W J; Thorne, R S; Watt, B J A; Watt, G

2012-01-01T23:59:59.000Z

225

CLNS 96/1434 Search for OE mesons in lepton decay  

E-Print Network [OSTI]

, 22 W.S. Brower, 22 G. Masek, 22 H.P. Paar, 22 J. Gronberg, 23 C.M. Korte, 23 D.J. Lange, 23 R, 1 J. Yelton, 1 G. Brandenburg, 2 R.A. Briere, 2 T. Liu, 2 M. Saulnier, 2 R. Wilson, 2 H. Yamamoto, 2, 25 S.L. Jones, 25 J. Kandaswamy, 25 N. Katayama, 25 P.C. Kim, 25 D.L. Kreinick, 25 T. Lee, 25 Y. Liu

226

Cross sections and energy loss for lepton pair production in muon transport  

E-Print Network [OSTI]

We reevaluate electron-positron pair production from electromagnetic interactions of muons in transit through materials. Our approach, through the use of structure functions for inelastic and elastic scattering and including hadronic recoil, make the formalism useful for tau pair production at high energies. Our results for electron-positron pair production agree well with prior evaluations. Tau pair production, has a significant contribution from inelastic scattering in addition to the usual coherent scattering with the nucleus and scattering with atomic electrons.

A. Bulmahn; M. H. Reno

2008-12-30T23:59:59.000Z

227

Search for the B to K nu nu-bar Decay Using Semi-Leptonic Tags  

SciTech Connect (OSTI)

We present an update of the search for the flavor-changing neutral current B{sup +} {yields} K{sup +}{nu}{bar {nu}} decay using 351 X 10{sup 6} B{bar B} pairs collected at the {Upsilon}(4S) resonance with the BABAR detector at the SLAC PEP-II B factory. Due to the presence of two neutrinos in the final state, we require the reconstruction of the companion B in the event through the decay channel B{sup -} {yields} D{sup 0}{ell}{sup -}{bar {nu}}X. We find 38 candidates in the data with an expected background of 31{-+} 12. This allows us to set an upper limit on the branching fraction for B{sup +} {yields} K{sup +}{nu}{bar {nu}} of 4.5 X 10{sup -5} at 90% confidence level.

Aubert, B.; Karyotakis, Y.; Lees, J.P.; Poireau, V.; Prencipe, E.; Prudent, X.; Tisserand, V.; /Annecy, LAPP; Garra Tico, J.; Grauges, E.; /Barcelona U., ECM; Martinelli, M.; Palano, A.; Pappagallo, M.; /INFN, Bari /Bari U.; Eigen, G.; Stugu, B.; Sun, L.; /Bergen U.; Battaglia, M.; Brown, D.N.; Hooberman, B.; Kerth, L.T.; Kolomensky, Yu.G.; Lynch, G. /UC, Berkeley /Birmingham U. /Ruhr U., Bochum /British Columbia U. /Brunel U. /Novosibirsk, IYF /UC, Irvine /UC, Riverside /UC, San Diego /UC, Santa Barbara /UC, Santa Cruz /Caltech /Cincinnati U. /Colorado U. /Colorado State U. /Dortmund U. /Dresden, Tech. U. /Ecole Polytechnique /Edinburgh U. /INFN, Ferrara /Ferrara U. /INFN, Ferrara /INFN, Ferrara /Ferrara U. /INFN, Ferrara /INFN, Ferrara /Ferrara U. /Frascati /INFN, Genoa /Genoa U. /INFN, Genoa /INFN, Genoa /Genoa U. /INFN, Genoa /INFN, Genoa /Genoa U. /Harvard U. /Heidelberg U. /Humboldt U., Berlin /Imperial Coll., London /Iowa State U. /Iowa State U. /Johns Hopkins U. /Orsay, LAL /LLNL, Livermore /Liverpool U. /Queen Mary, U. of London /Royal Holloway, U. of London /Louisville U. /Mainz U., Inst. Kernphys. /Manchester U. /Maryland U. /Massachusetts U., Amherst /MIT /McGill U. /INFN, Milan /Milan U. /INFN, Milan /INFN, Milan /Milan U. /Mississippi U. /Montreal U. /Mt. Holyoke Coll. /INFN, Naples /Naples U. /INFN, Naples /INFN, Naples /Naples U. /NIKHEF, Amsterdam /NIKHEF, Amsterdam /Notre Dame U. /Ohio State U. /Oregon U. /INFN, Padua /Padua U. /INFN, Padua /INFN, Padua /Padua U. /Paris U., VI-VII /Pennsylvania U. /INFN, Perugia /Perugia U. /INFN, Pisa /Pisa U. /INFN, Pisa /Pisa, Scuola Normale Superiore /INFN, Pisa /Pisa U. /INFN, Pisa /Princeton U. /INFN, Rome /Rome U. /INFN, Rome /Rome U. /Rome U. /INFN, Rome /Rome U. /INFN, Rome /Rome U. /Rome U. /INFN, Rome /Rome U. /INFN, Rome /Rome U. /Rome U. /INFN, Rome /Rome U. /INFN, Rome /Rome U. /Rome U. /INFN, Rome /Rome U. /Rostock U. /Rutherford /DAPNIA, Saclay /SLAC /South Carolina U. /Stanford U., Phys. Dept. /SUNY, Albany /Tel Aviv U. /Tennessee U. /Texas Nuclear Corp., Austin /Texas U., Dallas /INFN, Turin /Turin U. /INFN, Trieste /Trieste U. /Valencia U. /Victoria U. /Warwick U. /Wisconsin U., Madison

2010-06-02T23:59:59.000Z

228

1 INTRODUCTION Investigation into the eld of lepton-pair production in hadronic interactions be-  

E-Print Network [OSTI]

\\God-given" units, setting #22; h = c = 1. 1 #12; O(#11; 2 s ). Experimentally it has provided a wealth-energy and particle physics consist of the search for the ultimate constituents of matter and the study

229

Neutrino mass, sneutrino dark matter and signals of lepton flavor violation in the MRSSM  

Science Journals Connector (OSTI)

We study the phenomenology of mixed-sneutrino dark matter in the Minimal R-symmetric Supersymmetric Standard Model (MRSSM). Mixed sneutrinos fit naturally within the MRSSM, as the smallness (or absence) of neutri...

Abhishek Kumar; David Tucker-Smith; Neal Weiner

2010-09-01T23:59:59.000Z

230

NMSSM in disguise: Discovering singlino dark matter with soft leptons at the LHC  

E-Print Network [OSTI]

the results of a full simulation of the ATLAS detector, as presented in [23];3 3 For muons we use the results for combined muon system and inner detector tracks with |?| trace of the ?02 decay. This is demonstrated in Figure 2, showing...

Kraml, S; Raklev, Are R; White, Martin J

231

Test of Lepton Universality Using B[superscript +] ? K[superscript +]?[superscript +]?[superscript ?] Decays  

E-Print Network [OSTI]

A measurement of the ratio of the branching fractions of the B[superscript +] ? K[superscript +]?[superscript +]?[superscript -] and B[superscript +] ? K[superscript +]e[superscript +]e[superscript -] decays is presented ...

Aaij, R.

232

Consequence of total lepton number violation in strongly magnetized iron white dwarfs  

E-Print Network [OSTI]

The influence of neutrinoless electron to positron conversion on cooling of strongly magnetized iron white dwarfs is studied. It is shown that they can be good candidates for soft gamma-ray repeaters and anomalous X-ray pulsars.

V. B. Belyaev; P. Ricci; F. Simkovic; J. Adam, Jr.; M. Tater; E. Truhlik

2014-06-04T23:59:59.000Z

233

Top Quark Mass Measurement in the Lepton plus Jets Channel Using a Modified Matrix Element Method  

SciTech Connect (OSTI)

The authors report a measurement of the top quark mass, m{sub t}, obtained from p{bar p} collisions at {radical}s = 1.96 TeV at the Fermilab Tevatron using the CDF II detector. They analyze a sample corresponding to an integrated luminosity of 1.9 rfb{sup -1}. They select events with an electron or muon, large missing transverse energy, and exactly four high-energy jets in the central region of the detector, at least one of which is tagged as coming from a b quark. They calculate a signal likelihood using a matrix element integration method, where the matrix element is modified by using effective propagators to take into account assumptions on event kinematics. The event likelihood is a function of m{sub t} and a parameter JES that determines in situ the calibration of the jet energies. They use a neural network discriminant to distinguish signal from background events. They also apply a cut on the peak value of each event likelihood curve to reduce the contribution of background and badly reconstructed events. Using the 318 events that pass all selection criteria, they find m{sub t} = 172.7 {+-} 1.8 (stat. + JES) {+-} 1.2(syst.) GeV/c{sup 2}.

Aaltonen, T.; /Helsinki Inst. of Phys.; Adelman, J.; /Chicago U., EFI; Akimoto, T.; /Tsukuba U.; Alvarez Gonzalez, B.; /CSIC, Catalunya; Amerio, S.; /INFN, Padua; Amidei, D.; /Michigan U.; Anastassov, A.; /Northwestern U.; Annovi, A.; /Frascati; Antos, J.; /Comenius U.; Apollinari, G.; /Fermilab; Apresyan, A.; /Purdue U. /Waseda U.

2008-12-01T23:59:59.000Z

234

Modelling the very high energy flare of 3C279 using one-zone leptonic model  

Science Journals Connector (OSTI)

......Papers Modelling the very high energy flare of 3C279 using one-zone...AIP Conf. Vol. 745, High Energy Gamma-ray Astronomy: 2nd...International Symposium on High Energy Gamma-Ray Astronomy. Am. Inst. Phys., New York, p. 23. Shu F. H......

S. Sahayanathan; S. Godambe

2012-01-11T23:59:59.000Z

235

A measurement of the Michel parameters in leptonic decays of the tau  

E-Print Network [OSTI]

.R. Ross, 5 P. Skubic, 5 M. Wood, 5 M. Bishai, 6 J. Fast, 6 E. Gerndt, 6 J.W. Hinson, 6 N. Menon, 6 D.H. Miller, 6 E.I. Shibata, 6 I.P.J. Shipsey, 6 M. Yurko, 6 L. Gibbons, 7 S.D. Johnson, 7 Y. Kwon, 7 S. Roberts, 7 E.H. Thorndike, 7 C.P. Jessop, 8 K... background of s0.178 6 0.026d% [s1.08 6 0.16d%]. The number of observed events is consistent with expectations from world average branch- ing fractions. No correction is made for the small fake electron contamination. The product of the momentum 6 4687 VOLUME...

Ammar, Raymond G.; Baringer, Philip S.; Bean, Alice; Besson, David Zeke; Coppage, Don; Darling, C.; Davis, Robin E. P.; Hancock, N.; Kotov, S.; Kravchenko, I.; Kwak, Nowhan

1997-06-01T23:59:59.000Z

236

Exploring the Role of Lepton Mass in the Hydrogen Atom Frank Rioux  

E-Print Network [OSTI]

energy operator: T 1 2 µ r - 2 r r( ) d d 2 = Potential energy operator: V 1 r - = Variational trial wave energy integral: E µ,( ) 0 r r ,( ) 1 2 µ r - 2 r r r ,( )( )d d 2 4 r 2 d 0 r r ,( ) 1 r - r ,( ) 4 r 2 d+ ... assume 0>, simplify 1 2 2 µ- µ := #12;Minimize the energy

Rioux, Frank

237

Consequence of total lepton number violation in strongly magnetized iron white dwarfs  

SciTech Connect (OSTI)

The influence of a neutrinoless electron to positron conversion on a cooling of strongly magnetized iron white dwarfs is studied.

Belyaev, V. B. [Bogolyubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, Dubna 141980 (Russian Federation); Ricci, P. [Istituto Nazionale di Fisica Nucleare, Sezione di Firenze, I-50019 Sesto Fiorentino (Firenze) (Italy); imkovic, F. [Department of Nuclear Physics and Biophysics, Comenius University, Mlynsk dolina F1, SK-842 15, Bratislava, Slovakia and Bogolyubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, Dubna 141980 (Russian Federation); Adam, J. Jr.; Tater, M.; Truhlk, E. [Institute of Nuclear Physics ASCR, CZ-250 68 ?e (Czech Republic)

2013-12-30T23:59:59.000Z

238

Search for supersymmetry via associated production of charginos and neutralinos in final states with three leptons  

E-Print Network [OSTI]

the ~.0031 0 2 decay can have a very low transverse momentum if jm ~ ? .0255m ~.0031 0 2 j is small. In this region, only the .0022 .0006 .0022 .0006 selec- 151805-7 tutions, and acknowledge support from the DOE and NSF (USA), CEA and CNRS/IN2P3 (France.... Michaut, 18 H. Miettinen, 76 J. Mitrevski, 67 J. Molina, 3 N.K. Mondal, 29 R.W. Moore, 5 G.S. Muanza, 20 M. Mulders, 49 Y.D. Mutaf, 69 E. Nagy, 15 M. Narain, 60 N.A. Naumann, 34 H.A. Neal, 62 J.P. Negret, 8 S. Nelson, 48 P. Neustroev, 39 C. Noeding, 23 A...

Baringer, Philip S.; Bean, Alice; Christofek, L.; Coppage, Don; Gardner, J.; Hensel, Carsten; Jabeen, S.; Wilson, Graham Wallace

2005-10-01T23:59:59.000Z

239

Search for pair production of excited top quarks in the lepton + jets final state  

E-Print Network [OSTI]

A search is performed for pair-produced spin-3/2 excited top quarks (t[superscript ?][ over t][superscript ?]), each decaying to a top quark and a gluon. The search uses data collected with the CMS detector from pp ...

Apyan, Aram

240

Angular correlations of lepton pairs from vector boson and top quark decays in Monte Carlo simulations.  

E-Print Network [OSTI]

) u(k1)(?iFV )?? (VV l ?AV l?5) v(k2) , (2.15) 4 where mV and ?V are the mass and the width of the vector boson respectively, and M is the amplitude for the process a(P1) + b(P2) ?? V (q) +X(x) , (2.16) being the Lorentz index associated with V... to thank the CERN TH division for hospitality during the completion of this work. We also would like to thank Fabio Maltoni for his collaboration during early stages of this work, and Chris White for useful discussions. The work of E.L. and P...

Frixione, Stefano; Laenen, Eric; Motylinski, Patrick; Webber, Bryan R

Note: This page contains sample records for the topic "leptons leptons leptons" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


241

Quantum electrodynamics calculation of lepton anomalous magnetic moments: Numerical approach to the perturbation theory of QED  

Science Journals Connector (OSTI)

......464-8602, Japan 4 Laboratory for Elementary-Particle Physics, Cornell...the standard model of the elementary particles, a e can be written...diagram were regarded as an electric circuit in which the Feynman...parameter z i corresponds to the resistance of the line i: for any vertex......

Tatsumi Aoyama; Masashi Hayakawa; Toichiro Kinoshita; Makiko Nio

2012-01-01T23:59:59.000Z

242

DESY 11044 ISSN 04189833 Search for Lepton Flavour Violation at HERA  

E-Print Network [OSTI]

. Rostovtsev 24 , M. Rotaru 5 , J.E. Ruiz Tabasco 22 , S. Rusakov 25 , D. Ÿ S??alek 32 , D.P.C. Sankey 6 , M

243

Measurement of the $WW+WZ$ Production Cross Section Using a Matrix Element Technique in Lepton + Jets Events  

SciTech Connect (OSTI)

We present a measurement of the WW + WZ production cross section observed in a final state consisting of an identified electron or muon, two jets, and missing transverse energy. The measurement is carried out in a data sample corresponding to up to 4.6 fb{sup -1} of integrated luminosity at {radical}s = 1.96 TeV collected by the CDF II detector. Matrix element calculations are used to separate the diboson signal from the large backgrounds. The WW + WZ cross section is measured to be 17.4 {+-} 3.3 pb, in agreement with standard model predictions. A fit to the dijet invariant mass spectrum yields a compatible cross section measurement.

Aaltonen, T.; /Helsinki Inst. of Phys.; Alvarez Gonzalez, B.; /Oviedo U. /Cantabria Inst. of Phys.; Amerio, S.; /INFN, Padua; Amidei, D.; /Michigan U.; Anastassov, A.; /Northwestern U.; Annovi, A.; /Frascati; Antos, J.; /Comenius U.; Apollinari, G.; /Fermilab; Appel, J.A.; /Fermilab; Apresyan, A.; /Purdue U.; Arisawa, T.; /Waseda U. /Dubna, JINR

2010-08-01T23:59:59.000Z

244

First Measurements of the Differential Cross Sections of Higgs Boson Production and Decay in the Four Lepton Final State  

E-Print Network [OSTI]

The discovery of a new scalar particle in the search for the Higgs boson at the Large Hadron Collider (LHC) was a great success for the ATLAS and CMS collaborations. Additional measurements of this new particle present opportunities to both test the Standard Model (SM) predictions for the Higgs boson and to search for non-SM properties of this new particle. This thesis presents measurements of the mass, signal strength, and production cross sections of the Higgs boson in the $H \\rightarrow ZZ^{(*)} \\rightarrow \\ell\\ell\\ell'\\ell' $($\\ell,\\ell'=e,\\mu$) decay channel. The cross section measurements are performed using 20.3 fb$^{-1}$ of $pp$ collisions at center of mass energy $\\sqrt{s}=8$ TeV collected by the ATLAS detector and the mass and signal strength measurements are performed using an additional 4.5 fb$^{-1}$ of $pp$ collisions at $\\sqrt{s}=7$ TeV. From the data in the $H \\rightarrow4\\ell$ channel, the best estimate of the mass is $124.51~\\pm~0.52~\\rm{(stat)}~\\pm 0.06~\\rm{(syst)}$ GeV. The signal str...

Stahlman, Jonathan Mark

245

y Vacuum Polarization in Low Energy Physics: g -2 1. g -2 introduction, history, muon properties, lepton moments  

E-Print Network [OSTI]

y Vacuum Polarization in Low Energy Physics: g - 2 1. g - 2 introduction, history, muon properties ; F2(0) = aµ aµ responsible for the Larmor precession directly proportional at magic energy 3.1 Ge theory at tree level aµ is a pure "quantum correction" effect: a finite model-specific prediction in any

Röder, Beate

246

CDF measurement of the top quark mass in the lepton + jets channel using the multivariate template method  

SciTech Connect (OSTI)

The authors measure the mass of the top quark using 162 pb{sup -1} of data collected by the CDF experiment at FNAL in Run II. The decay chain t{bar t} {yields} bq{bar q}{bar b}lv is studied using a novel technique called the Multivariate Template Method (MTM). Using this technique they obtain a result of M{sub top} = 179.6{sub -6.3}{sup +6.4} {+-} 6.8 GeV/c{sup 2} for the top quark.

Freeman, John; /Fermilab

2004-12-01T23:59:59.000Z

247

Testing the Zee-Babu model via neutrino data, lepton flavour violation and direct searches at the LHC  

E-Print Network [OSTI]

We discuss how the Zee-Babu model can be tested combining information from neutrino data, low-energy experiments and direct searches at the LHC. We update previous analysis in the light of the recent measurement of the neutrino mixing angle $\\theta_{13}$, the new MEG limits on $\\mu \\rightarrow e \\gamma$, the lower bounds on doubly-charged scalars coming from LHC data, and, of course, the discovery of a 125 GeV Higgs boson by ATLAS and CMS. In particular, we find that the new singly- and doubly-charged scalars are accessible at the second run of the LHC, yielding different signatures depending on the neutrino hierarchy and on the values of the phases. We also discuss in detail the stability of the potential.

Herrero-Garcia, Juan; Rius, Nuria; Santamaria, Arcadi

2014-01-01T23:59:59.000Z

248

Search for pair production of scalar top quarks decaying to a tau lepton and a b quark in 1.96-tev ppbar collisions  

E-Print Network [OSTI]

I present the results of a search for pair production of scalar top quarks (~t1) in an R-parity violating supersymmetric scenario using 322 pb_1 of pp collisions at ps = 1.96 TeV collected by the upgraded Collider Detector at Fermilab. I assume each...

Khotilovich, Vadim Gennadyevich

2009-05-15T23:59:59.000Z

249

Measurement of the direct $CP$ asymmetry in $\\bar{B}\\rightarrow X_{s+d}\\gamma$ decays with a lepton tag  

E-Print Network [OSTI]

We report the measurement of the direct $CP$ asymmetry in the radiative $\\bar{B}\\rightarrow X_{s+d}\\gamma$ decay using a data sample of $(772 \\pm 11)\\times 10^6$ $B\\bar{B}$ pairs collected at the $\\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider. The $CP$ asymmetry is measured as a function of the photon energy threshold. For $E^{\\rm{*}}_{\\gamma} \\geq 2.1~{\\rm{GeV}}$, where $E^{\\rm{*}}_{\\gamma}$ is the photon energy in the center-of-mass frame, we obtain $\\mathcal{A}_{CP}(\\bar{B}\\rightarrow X_{s+d}\\gamma)= (2.2 \\pm 3.9 \\pm 0.9) \\%$, consistent with the Standard Model prediction.

Pesntez, L; Dingfelder, J; Abdesselam, A; Adachi, I; Adamczyk, K; Aihara, H; Said, S Al; Arinstein, K; Asner, D M; Aulchenko, V; Aushev, T; Ayad, R; Bahinipati, S; Bakich, A M; Bansal, V; Barberio, E; Bhardwaj, V; Bhuyan, B; Bobrov, A; Bondar, A; Bonvicini, G; Bozek, A; Bra?ko, M; Browder, T E; ?ervenkov, D; Chekelian, V; Chen, A; Cheon, B G; Chilikin, K; Chistov, R; Cho, K; Chobanova, V; Choi, Y; Cinabro, D; Dalseno, J; Doleal, Z; Drsal, Z; Drutskoy, A; Dutta, D; Eidelman, S; Farhat, H; Fast, J E; Ferber, T; Frost, O; Gaur, V; Gabyshev, N; Ganguly, S; Garmash, A; Getzkow, D; Gillard, R; Goh, Y M; Golob, B; Haba, J; Hasenbusch, J; He, X H; Heller, A; Horiguchi, T; Hou, W -S; Huschle, M; Iijima, T; Inami, K; Ishikawa, A; Itoh, R; Iwasaki, Y; Jaegle, I; Joffe, D; Julius, T; Kang, K H; Kato, E; Kawasaki, T; Kiesling, C; Kim, D Y; Kim, J B; Kim, J H; Kim, K T; Kim, M J; Kim, S H; Kim, Y J; Ko, B R; Kody, P; Korpar, S; Krian, P; Krokovny, P; Kronenbitter, B; Kuhr, T; Kumita, T; Kuzmin, A; Kwon, Y -J; Lange, J S; Lee, I S; Li, Y; Gioi, L Li; Libby, J; Liventsev, D; Lukin, P; Matvienko, D; Miyabayashi, K; Miyata, H; Mizuk, R; Mohanty, G B; Moll, A; Moon, H K; Nakano, E; Nakao, M; Nanut, T; Natkaniec, Z; Nayak, M; Ng, C; Nisar, N K; Nishida, S; Ogawa, S; Okuno, S; Olsen, S L; Oswald, C; Pakhlov, P; Pakhlova, G; Park, C W; Park, H; Pedlar, T K; Pestotnik, R; Petri?, M; Piilonen, L E; Ribel, E; Ritter, M; Rostomyan, A; Rozanska, M; Sakai, Y; Sandilya, S; Santelj, L; Sanuki, T; Sato, Y; Savinov, V; Schneider, O; Schwanda, C; Schwartz, A J; Senyo, K; Seon, O; Sevior, M E; Shebalin, V; Shen, C P; Shibata, T -A; Shiu, J -G; Shwartz, B; Sibidanov, A; Simon, F; Sohn, Y -S; Sokolov, A; Solovieva, E; Stari?, M; Steder, M; Sumiyoshi, T; Tamponi, U; Taniguchi, N; Tatishvili, G; Teramoto, Y; Trabelsi, K; Uchida, M; Uglov, T; Unno, Y; Uno, S; Usov, Y; Van Hulse, C; Vanhoefer, P; Varner, G; Vinokurova, A; Vorobyev, V; Wagner, M N; Wang, B; Wang, C H; Wang, M -Z; Wang, P; Watanabe, Y; Williams, K M; Won, E; Yamaoka, J; Yashchenko, S; Yook, Y; Zhang, Z P; Zhilich, V; Zhulanov, V

2015-01-01T23:59:59.000Z

250

Measurement of the Single Top Quark Production Cross Section and |Vtb| in Events with One Charged Lepton, Large Missing Transverse Energy, and Jets at CDF  

E-Print Network [OSTI]

We report a measurement of single top quark production in proton-antiproton collisions at a center-of-mass energy of \\sqrt{s} = 1.96 TeV using a data set corresponding to 7.5 fb-1 of integrated luminosity collected by the Collider Detector at Fermilab. We select events consistent with the single top quark decay process t \\to Wb \\to l{\

CDF Collaboration; T. Aaltonen; S. Amerio; D. Amidei; A. Anastassov; A. Annovi; J. Antos; G. Apollinari; J. A. Appel; T. Arisawa; A. Artikov; J. Asaadi; W. Ashmanskas; B. Auerbach; A. Aurisano; F. Azfar; W. Badgett; T. Bae; A. Barbaro-Galtieri; V. E. Barnes; B. A. Barnett; P. Barria; P. Bartos; M. Bauce; F. Bedeschi; S. Behari; G. Bellettini; J. Bellinger; D. Benjamin; A. Beretvas; A. Bhatti; K. R. Bland; B. Blumenfeld; A. Bocci; A. Bodek; D. Bortoletto; J. Boudreau; A. Boveia; L. Brigliadori; C. Bromberg; E. Brucken; J. Budagov; H. S. Budd; K. Burkett; G. Busetto; P. Bussey; P. Butti; A. Buzatu; A. Calamba; S. Camarda; M. Campanelli; F. Canelli; B. Carls; D. Carlsmith; R. Carosi; S. Carrillo; B. Casal; M. Casarsa; A. Castro; P. Catastini; D. Cauz; V. Cavaliere; A. Cerri; L. Cerrito; Y. C. Chen; M. Chertok; G. Chiarelli; G. Chlachidze; K. Cho; D. Chokheli; A. Clark; C. Clarke; M. E. Convery; J. Conway; M. Corbo; M. Cordelli; C. A. Cox; D. J. Cox; M. Cremonesi; D. Cruz; J. Cuevas; R. Culbertson; N. d'Ascenzo; M. Datta; P. de Barbaro; L. Demortier; L. Marchese; M. Deninno; F. Devoto; M. D'Errico; A. Di Canto; B. Di Ruzza; J. R. Dittmann; M. D'Onofrio; S. Donati; M. Dorigo; A. Driutti; K. Ebina; R. Edgar; A. Elagin; R. Erbacher; S. Errede; B. Esham; S. Farrington; J. P. Fernndez Ramos; R. Field; G. Flanagan; R. Forrest; M. Franklin; J. C. Freeman; H. Frisch; Y. Funakoshi; C. Galloni; A. F. Garfinkel; P. Garosi; H. Gerberich; E. Gerchtein; S. Giagu; V. Giakoumopoulou; K. Gibson; C. M. Ginsburg; N. Giokaris; P. Giromini; V. Glagolev; D. Glenzinski; M. Gold; D. Goldin; A. Golossanov; G. Gomez; G. Gomez-Ceballos; M. Goncharov; O. Gonzlez Lpez; I. Gorelov; A. T. Goshaw; K. Goulianos; E. Gramellini; C. Grosso-Pilcher; R. C. Group; J. Guimaraes da Costa; S. R. Hahn; J. Y. Han; F. Happacher; K. Hara; M. Hare; R. F. Harr; T. Harrington-Taber; K. Hatakeyama; C. Hays; J. Heinrich; M. Herndon; A. Hocker; Z. Hong; W. Hopkins; S. Hou; R. E. Hughes; U. Husemann; M. Hussein; J. Huston; G. Introzzi; M. Iori; A. Ivanov; E. James; D. Jang; B. Jayatilaka; E. J. Jeon; S. Jindariani; M. Jones; K. K. Joo; S. Y. Jun; T. R. Junk; M. Kambeitz; T. Kamon; P. E. Karchin; A. Kasmi; Y. Kato; W. Ketchum; J. Keung; B. Kilminster; D. H. Kim; H. S. Kim; J. E. Kim; M. J. Kim; S. B. Kim; S. H. Kim; Y. K. Kim; Y. J. Kim; N. Kimura; M. Kirby; K. Knoepfel; K. Kondo; D. J. Kong; J. Konigsberg; A. V. Kotwal; M. Kreps; J. Kroll; M. Kruse; T. Kuhr; M. Kurata; A. T. Laasanen; S. Lammel; M. Lancaster; K. Lannon; G. Latino; H. S. Lee; J. S. Lee; S. Leo; S. Leone; J. D. Lewis; A. Limosani; E. Lipeles; A. Lister; H. Liu; Q. Liu; T. Liu; S. Lockwitz; A. Loginov; A. Luc; D. Lucchesi; J. Lueck; P. Lujan; P. Lukens; G. Lungu; J. Lys; R. Lysak; R. Madrak; P. Maestro; S. Malik; G. Manca; A. Manousakis-Katsikakis; F. Margaroli; P. Marino; K. Matera; M. E. Mattson; A. Mazzacane; P. Mazzanti; R. McNulty; A. Mehta; P. Mehtala; C. Mesropian; T. Miao; D. Mietlicki; A. Mitra; H. Miyake; S. Moed; N. Moggi; C. S. Moon; R. Moore; M. J. Morello; A. Mukherjee; Th. Muller; P. Murat; M. Mussini; J. Nachtman; Y. Nagai; J. Naganoma; I. Nakano; A. Napier; J. Nett; C. Neu; T. Nigmanov; L. Nodulman; S. Y. Noh; O. Norniella; L. Oakes; S. H. Oh; Y. D. Oh; I. Oksuzian; T. Okusawa; R. Orava; L. Ortolan; C. Pagliarone; E. Palencia; P. Palni; V. Papadimitriou; W. Parker; G. Pauletta; M. Paulini; C. Paus; T. J. Phillips; E. Pianori; J. Pilot; K. Pitts; C. Plager; L. Pondrom; S. Poprocki; K. Potamianos; F. Prokoshin; A. Pranko; F. Ptohos; G. Punzi; I. Redondo Fernndez; P. Renton; M. Rescigno; F. Rimondi; L. Ristori; A. Robson; T. Rodriguez; S. Rolli; M. Ronzani; R. Roser; J. L. Rosner; F. Ruffini; A. Ruiz; J. Russ; V. Rusu; W. K. Sakumoto; Y. Sakurai; L. Santi; K. Sato; V. Saveliev; A. Savoy-Navarro; P. Schlabach; E. E. Schmidt; T. Schwarz; L. Scodellaro; F. Scuri; S. Seidel; Y. Seiya; A. Semenov; F. Sforza; S. Z. Shalhout; T. Shears; P. F. Shepard; M. Shimojima; M. Shochet; I. Shreyber-Tecker; A. Simonenko; K. Sliwa; J. R. Smith; F. D. Snider; V. Sorin; H. Song; M. Stancari; R. St. Denis; D. Stentz; J. Strologas; Y. Sudo; A. Sukhanov; I. Suslov; K. Takemasa; Y. Takeuchi; J. Tang; M. Tecchio; P. K. Teng; J. Thom; E. Thomson; V. Thukral; D. Toback; S. Tokar; K. Tollefson; T. Tomura; D. Tonelli; S. Torre; D. Torretta; P. Totaro; M. Trovato; F. Ukegawa; S. Uozumi; F. Vzquez; G. Velev; C. Vellidis; C. Vernieri; M. Vidal; R. Vilar; J. Vizn; M. Vogel; G. Volpi; P. Wagner; R. Wallny; S. M. Wang; D. Waters; W. C. Wester III; D. Whiteson; A. B. Wicklund; S. Wilbur; H. H. Williams; J. S. Wilson; P. Wilson; B. L. Winer; P. Wittich; S. Wolbers; H. Wolfe; T. Wright; X. Wu; Z. Wu; K. Yamamoto; D. Yamato; T. Yang; U. K. Yang; Y. C. Yang; W. -M. Yao; G. P. Yeh; K. Yi; J. Yoh; K. Yorita; T. Yoshida; G. B. Yu; I. Yu; A. M. Zanetti; Y. Zeng; C. Zhou; S. Zucchelli

2014-07-15T23:59:59.000Z

251

Search for supersymetric particles desintegrant itself in R-parite violee (coupling lambda_121) in a final state has three leptons  

SciTech Connect (OSTI)

This thesis is dedicated to the study of the first data taken by the D0 detector during the Run II of the Tevatron. Supersymmetric particles have been search for in proton-antiproton collisions, with a center of mass energy of 1.96 TeV. In the framework of supersymmetry with R-parity violation, I have studied the pair production of Gauginos, leading to a pair of LSP ({chi}{sub 1}{sup 0}), each one decaying into ee{nu}{sub {mu}} or e{mu}{nu}{sub e} with a {lambda}{sub 121} coupling. The final state contains at least two electrons: I have thus paid special attention in this work to the methods concerning identification and mis-identification of electromagnetic particles, as well as reconstruction, triggering, and correction (of the reconstructed energy). In a selection of trileptons, with at least two electrons, and some transverse missing energy, we observed 0 event in the 350 pb{sup -1} of analyzed data, for 0,4{sub -0,05}{sup +0,35}(stat) {+-} 0,16 (sys) expected from the Standard Model contributions. In the signal considered in this analysis, the selection efficiency is around 12%. Results have been studied in two models: mSUGRA and MSSM. In mSUGRA model, limits on m{sub 1/2} and lightest gauginos's masses have been obtained, with tan{beta} = 5, A{sub 0} = 0, m{sub 0} = 100 and 1000 GeV.c{sup -2} and both signs of {mu}. In MSSM, with the hypothesis of massive sfermions (1000 GeV.c{sup -2}), we can exclude, at 95% Confidence Level, the region m{sub {chi}{sub 1}}{+-} < 200 GeV.c{sup -2}, for all masses of {chi}{sub 1}{sup 0} LSP.

Magnan, Anne-Marie; /LPSC, Grenoble; ,

2005-07-01T23:59:59.000Z

252

A Measurement of the mass of the Top Quark in the di-lepton channels using the D0 Detector at Fermilab  

SciTech Connect (OSTI)

This dissertation describes a measurement of the mass of the top quark using events consistent with the hypothesis t{bar t} {yields} bW{sup +} {bar b}W{sup -} {yields} bl{sup +}{nu}{bar b}l{sup -}{bar {nu}}, where (l=e,{mu}). The events are obtained from nearly 230 pb{sup -1} of p{bar p} collision data collected by the D0 experiment between 2002 and 2004 during Run II. In this decay channel two neutrinos remain undetected. Extraction of the mass of the top quark by kinematic reconstruction is not possible because the event is under-constrained. Therefore, a dynamical likelihood method is developed to obtain the mass of the top quark. The mass of top quark obtained from the candidate events selected in the di-electron channel and the e{mu} channel is: 154.1 {sup +14.2}{sub -12.8}(stat.) {+-}6.6 (syst.) GeV.

Fatakia, Sarosh Noshir; /Boston U.; ,

2005-01-01T23:59:59.000Z

253

Measurement of the ZZ production cross section and search for the standard model Higgs boson in the four lepton final state in pp collisions  

Science Journals Connector (OSTI)

We present a measurement of Z boson pair production in pp collisions at 1.96TeV with 9.6 to 9.8??fb-1 of D0 data. We examine the final states eeee, ee??, and ????. Based on selected data, the measured cross section in the mass region M(Z/?*)>30??GeV is ?(pp?Z/?*Z/?*)=1.26-0.36+0.44(stat)-0.15+0.17(syst)0.08(lumi)??pb; after correcting for the expected ratio of ?(pp?Z/?*Z/?*) to ?(pp?ZZ), we derive a cross section for pp?ZZ production of 1.05-0.30+0.37(stat)-0.12+0.14(syst)0.06(lumi)??pb. This result is combined with a previous result from the ZZ??+?-?? channel resulting in a combined pp?ZZ cross section measurement of 1.32-0.25+0.29(stat)0.12(syst)0.04(lumi)??pb. These measurements are consistent with the standard model expectation of 1.430.10??pb. We extend this analysis to search for the standard model (SM) Higgs boson between 115 and 200GeV. At a Higgs boson mass of 125GeV, we expect to set a limit of 43 times the SM expectation at 95%C.L., and set a limit of 42 times the SM expectation at 95%C.L.

V. M. Abazov et al. (D0 Collaboration)

2013-08-15T23:59:59.000Z

254

Measurement of the Single Top Quark Production Cross Section and |Vtb| in Events with One Charged Lepton, Large Missing Transverse Energy, and Jets at CDF  

E-Print Network [OSTI]

We report a measurement of single top quark production in proton-antiproton collisions at a center-of-mass energy of \\sqrt{s} = 1.96 TeV using a data set corresponding to 7.5 fb-1 of integrated luminosity collected by the Collider Detector at Fermilab. We select events consistent with the single top quark decay process t \\to Wb \\to l{\

CDF Collaboration; T. Aaltonen; S. Amerio; D. Amidei; A. Anastassov; A. Annovi; J. Antos; G. Apollinari; J. A. Appel; T. Arisawa; A. Artikov; J. Asaadi; W. Ashmanskas; B. Auerbach; A. Aurisano; F. Azfar; W. Badgett; T. Bae; A. Barbaro-Galtieri; V. E. Barnes; B. A. Barnett; P. Barria; P. Bartos; M. Bauce; F. Bedeschi; S. Behari; G. Bellettini; J. Bellinger; D. Benjamin; A. Beretvas; A. Bhatti; K. R. Bland; B. Blumenfeld; A. Bocci; A. Bodek; D. Bortoletto; J. Boudreau; A. Boveia; L. Brigliadori; C. Bromberg; E. Brucken; J. Budagov; H. S. Budd; K. Burkett; G. Busetto; P. Bussey; P. Butti; A. Buzatu; A. Calamba; S. Camarda; M. Campanelli; F. Canelli; B. Carls; D. Carlsmith; R. Carosi; S. Carrillo; B. Casal; M. Casarsa; A. Castro; P. Catastini; D. Cauz; V. Cavaliere; A. Cerri; L. Cerrito; Y. C. Chen; M. Chertok; G. Chiarelli; G. Chlachidze; K. Cho; D. Chokheli; A. Clark; C. Clarke; M. E. Convery; J. Conway; M. Corbo; M. Cordelli; C. A. Cox; D. J. Cox; M. Cremonesi; D. Cruz; J. Cuevas; R. Culbertson; N. d'Ascenzo; M. Datta; P. de Barbaro; L. Demortier; L. Marchese; M. Deninno; F. Devoto; M. D'Errico; A. Di Canto; B. Di Ruzza; J. R. Dittmann; M. D'Onofrio; S. Donati; M. Dorigo; A. Driutti; K. Ebina; R. Edgar; A. Elagin; R. Erbacher; S. Errede; B. Esham; S. Farrington; J. P. Fernndez Ramos; R. Field; G. Flanagan; R. Forrest; M. Franklin; J. C. Freeman; H. Frisch; Y. Funakoshi; C. Galloni; A. F. Garfinkel; P. Garosi; H. Gerberich; E. Gerchtein; S. Giagu; V. Giakoumopoulou; K. Gibson; C. M. Ginsburg; N. Giokaris; P. Giromini; V. Glagolev; D. Glenzinski; M. Gold; D. Goldin; A. Golossanov; G. Gomez; G. Gomez-Ceballos; M. Goncharov; O. Gonzlez Lpez; I. Gorelov; A. T. Goshaw; K. Goulianos; E. Gramellini; C. Grosso-Pilcher; R. C. Group; J. Guimaraes da Costa; S. R. Hahn; J. Y. Han; F. Happacher; K. Hara; M. Hare; R. F. Harr; T. Harrington-Taber; K. Hatakeyama; C. Hays; J. Heinrich; M. Herndon; D. Hirschbuehl; A. Hocker; Z. Hong; W. Hopkins; S. Hou; R. E. Hughes; U. Husemann; M. Hussein; J. Huston; G. Introzzi; M. Iori; A. Ivanov; E. James; D. Jang; B. Jayatilaka; E. J. Jeon; S. Jindariani; M. Jones; K. K. Joo; S. Y. Jun; T. R. Junk; M. Kambeitz; T. Kamon; P. E. Karchin; A. Kasmi; Y. Kato; W. Ketchum; J. Keung; B. Kilminster; D. H. Kim; H. S. Kim; J. E. Kim; M. J. Kim; S. B. Kim; S. H. Kim; Y. K. Kim; Y. J. Kim; N. Kimura; M. Kirby; K. Knoepfel; K. Kondo; D. J. Kong; J. Konigsberg; A. V. Kotwal; M. Kreps; J. Kroll; M. Kruse; T. Kuhr; M. Kurata; A. T. Laasanen; S. Lammel; M. Lancaster; K. Lannon; G. Latino; H. S. Lee; J. S. Lee; S. Leo; S. Leone; J. D. Lewis; A. Limosani; E. Lipeles; A. Lister; H. Liu; Q. Liu; T. Liu; S. Lockwitz; A. Loginov; A. Luc; D. Lucchesi; J. Lueck; P. Lujan; P. Lukens; G. Lungu; J. Lys; R. Lysak; R. Madrak; P. Maestro; S. Malik; G. Manca; A. Manousakis-Katsikakis; F. Margaroli; P. Marino; K. Matera; M. E. Mattson; A. Mazzacane; P. Mazzanti; R. McNulty; A. Mehta; P. Mehtala; C. Mesropian; T. Miao; D. Mietlicki; A. Mitra; H. Miyake; S. Moed; N. Moggi; C. S. Moon; R. Moore; M. J. Morello; A. Mukherjee; Th. Muller; P. Murat; M. Mussini; J. Nachtman; Y. Nagai; J. Naganoma; I. Nakano; A. Napier; J. Nett; C. Neu; T. Nigmanov; L. Nodulman; S. Y. Noh; O. Norniella; L. Oakes; S. H. Oh; Y. D. Oh; I. Oksuzian; T. Okusawa; R. Orava; L. Ortolan; C. Pagliarone; E. Palencia; P. Palni; V. Papadimitriou; W. Parker; G. Pauletta; M. Paulini; C. Paus; T. J. Phillips; E. Pianori; J. Pilot; K. Pitts; C. Plager; L. Pondrom; S. Poprocki; K. Potamianos; F. Prokoshin; A. Pranko; F. Ptohos; G. Punzi; I. Redondo Fernndez; P. Renton; M. Rescigno; F. Rimondi; L. Ristori; A. Robson; T. Rodriguez; S. Rolli; M. Ronzani; R. Roser; J. L. Rosner; F. Ruffini; A. Ruiz; J. Russ; V. Rusu; W. K. Sakumoto; Y. Sakurai; L. Santi; K. Sato; V. Saveliev; A. Savoy-Navarro; P. Schlabach; E. E. Schmidt; T. Schwarz; L. Scodellaro; F. Scuri; S. Seidel; Y. Seiya; A. Semenov; F. Sforza; S. Z. Shalhout; T. Shears; P. F. Shepard; M. Shimojima; M. Shochet; I. Shreyber-Tecker; A. Simonenko; K. Sliwa; J. R. Smith; F. D. Snider; V. Sorin; H. Song; M. Stancari; R. St. Denis; D. Stentz; J. Strologas; Y. Sudo; A. Sukhanov; I. Suslov; K. Takemasa; Y. Takeuchi; J. Tang; M. Tecchio; P. K. Teng; J. Thom; E. Thomson; V. Thukral; D. Toback; S. Tokar; K. Tollefson; T. Tomura; D. Tonelli; S. Torre; D. Torretta; P. Totaro; M. Trovato; F. Ukegawa; S. Uozumi; F. Vzquez; G. Velev; C. Vellidis; C. Vernieri; M. Vidal; R. Vilar; J. Vizn; M. Vogel; G. Volpi; P. Wagner; R. Wallny; S. M. Wang; D. Waters; W. C. Wester III; D. Whiteson; A. B. Wicklund; S. Wilbur; H. H. Williams; J. S. Wilson; P. Wilson; B. L. Winer; P. Wittich; S. Wolbers; H. Wolfe; T. Wright; X. Wu; Z. Wu; K. Yamamoto; D. Yamato; T. Yang; U. K. Yang; Y. C. Yang; W. -M. Yao; G. P. Yeh; K. Yi; J. Yoh; K. Yorita; T. Yoshida; G. B. Yu; I. Yu; A. M. Zanetti; Y. Zeng; C. Zhou; S. Zucchelli

2015-01-25T23:59:59.000Z

255

Measurement of the Single Top Quark Production Cross Section and |V[subscript tb]| in Events with One Charged Lepton, Large Missing Transverse Energy, and Jets at CDF  

E-Print Network [OSTI]

We report a measurement of single top quark production in proton-antiproton collisions at a center-of-mass energy of ?s = 1.96??TeV using a data set corresponding to 7.5??fb[superscript -1] of integrated luminosity collected ...

Aaltonen, T.

256

Search for heavy quarks decaying into a top quark and a W or Z boson using lepton + jets events in pp collisions at s?=7 TeV  

E-Print Network [OSTI]

. Tuovinen, D. Ungaro, L. Wendland 14 J H E P01(2013)154 Lappeenranta University of Technology, Lappeenranta, Finland K. Banzuzi, A. Karjalainen, A. Korpela, T. Tuuva DSM/IRFU, CEA/Saclay, Gif-sur-Yvette, France M. Besancon, S. Choudhury, M. Dejardin, D...

Baringer, Philip S.; Bean, Alice; Benelli, Gabriele; Kenny, R. P. III; Murray, Michael J.; Noonan, Danny; Sanders, Stephen J.; Stringer, Robert W.; Tinti, Gemma; Wood, Jeffrey Scott; Zhukova, Victoria; Chatrchyan, S.; Khachatryan, V.; Sirunyan, A. M.; Tumasyan, A.; Adam, W.; Aguilo, E.

2013-01-24T23:59:59.000Z

257

Search for $W'\\rightarrow t\\bar{b}$ in the lepton plus jets final states with the ATLAS detector at the LHC  

E-Print Network [OSTI]

This document presents a search for a $W'$ boson, decaying to a top quark and a $b$ quark in an effective coupling approach, using a multivariate method based on boosted decision trees. It reports exclusion limits on the $W'\\rightarrow tb$ cross-section times branching ratio and effective couplings as a function of the $W'$-boson mass. The search covers $W'$-boson masses between 0.5 and 3.0 TeV, for right-handed or left-handed $W'$-boson, with 20.3 fb$^{-1}$ of proton-proton collision data produced by the LHC in 2012, at a center-of-mass energy of 8 TeV and collected by the ATLAS detector.

Geoffrey Gilles

2014-11-28T23:59:59.000Z

258

Measurement of the ZZ production cross section and search for the standard model Higgs boson in the four lepton final state in pp-bar collisions  

E-Print Network [OSTI]

. Zhu,55 M. Zielinski,62 D. Zieminska,48 and L. Zivkovic14 (D0 Collaboration) PHYSICAL REVIEW D 88, 032008 (2013) 1550-7998=2013=88(3)=032008(14) 032008-1 #1; 2013 American Physical Society 1LAFEX, Centro Brasileiro de Pesquisas F?sicas, Rio de Janeiro..., Piscataway, New Jersey 08855, USA 60Princeton University, Princeton, New Jersey 08544, USA 61State University of New York, Buffalo, New York 14260, USA V.M. ABAZOV et al. PHYSICAL REVIEW D 88, 032008 (2013) 032008-2 62University of Rochester, Rochester, New...

Baringer, Philip S.; Bean, Alice; Chen, G.; Clutter, Justace Randall; Sekaric, Jadranka; Wilson, Graham Wallace; Abazov, V. M.; Abbott, B.; Acharya, B. S.; Adams, M.; Adams, T.; Agnew, J. P.; Alexeev, G. D.; Alkhazov, G.; Alton, A.; Askew, A.

2013-08-15T23:59:59.000Z

259

Search for pair produced fourth-generation up-type quarks in pp collisions at ?s = 7 TeV with a lepton in the final state  

E-Print Network [OSTI]

The results of a search for the pair production of a fourth-generation up-type quark (t?) in protonproton collisions at ?s = 7 TeV are presented, using data corresponding to an integrated luminosity of about 5.0 ...

Apyan, Aram

260

Search for $W'\\rightarrow t\\bar{b}$ in the lepton plus jets final states with the ATLAS detector at the LHC  

E-Print Network [OSTI]

This document presents a search for a $W'$ boson, decaying to a top quark and a $b$ quark in an effective coupling approach, using a multivariate method based on boosted decision trees. It reports exclusion limits on the $W'\\rightarrow tb$ cross-section times branching ratio and effective couplings as a function of the $W'$-boson mass. The search covers $W'$-boson masses between 0.5 and 3.0 TeV, for right-handed or left-handed $W'$-boson, with 20.3 fb$^{-1}$ of proton-proton collision data produced by the LHC in 2012, at a center-of-mass energy of 8 TeV and collected by the ATLAS detector.

Gilles, Geoffrey

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "leptons leptons leptons" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


261

Introduction Model Dependent  

E-Print Network [OSTI]

lepton ZEUS Depleted Uranium Calorimeter Optimised for precision measurement of the hadronic final state

262

Introduction New currents in DIS  

E-Print Network [OSTI]

for precision measurement of the scattered lepton ZEUS Depleted Uranium Calorimeter Optimised for precision

263

Search for neutrinoless tau decays ! 3` and ! `K 0 Y. Yusa a , H. Hayashii b , T. Nagamine a , A. Yamaguchi a for the Belle collaboration  

E-Print Network [OSTI]

1 Search for neutrinoless tau decays #28; ! 3` and #28; ! `K 0 S Y. Yusa a , H. Hayashii b , T-machi, Nara 630-8506, Japan. Neutrinoless tau-lepton decays into either three leptons (#28; ! ` 1 `2 `3

264

Neutrinoless Double Beta Decay and CP Violation  

E-Print Network [OSTI]

neutrinoless double beta decay in the case of two neutrino generations (or when the third generation leptons do

Patrick J. Odonnell; Utpal Sarkar

1993-01-01T23:59:59.000Z

265

In-medium properties of hadrons Introduction & Motivation  

E-Print Network [OSTI]

-lepton decays: no (strong) final state interaction HADES detector at GSI starts data taking disadvantage of HI

Krusche, Bernd

266

Neutrino masses, dominant neutrinoless double beta decay, and observable lepton flavor violation in left-right models and SO(10) grand unification with low mass $\\bf W_R, Z_R$ bosons  

E-Print Network [OSTI]

While the detection of $W_R$-boson at the Large Hadron Collider is likely to resolve the mystery of parity violation in weak interaction, observation of neutrinoless double beta decay ($0\

Ram Lal Awasthi; M. K. Parida; Sudhanwa Patra

2013-02-04T23:59:59.000Z

267

Search for $W' \\to t\\bar{b}$ in the lepton plus jets final state in proton-proton collisions at a centre-of-mass energy of $\\sqrt{s}$ = 8 TeV with the ATLAS detector  

E-Print Network [OSTI]

A search for new charged massive gauge bosons, called $W'$, is performed with the ATLAS detector at the LHC, in proton-proton collisions at a centre-of-mass energy of $\\sqrt{s}$ = 8 TeV, using a dataset corresponding to an integrated luminosity of 20.3 fb$^{-1}$. This analysis searches for $W'$ bosons in the $W' \\to t\\bar{b}$ decay channel in final states with electrons or muons, using a multivariate method based on boosted decision trees. The search covers masses between 0.5 and 3.0 TeV, for right-handed or left-handed $W'$ bosons. No significant deviation from the Standard Model expectation is observed and limits are set on the $W' \\to t\\bar{b}$ cross-section times branching ratio and on the $W'$-boson effective couplings as a function of the $W'$-boson mass using the CL$_s$ procedure. For a left-handed (right-handed) $W'$ boson, masses below 1.70 (1.92) TeV are excluded at 95% confidence level.

ATLAS Collaboration

2015-02-16T23:59:59.000Z

268

Measurement of WZ production and searches for anomalous top quark decays and Higgs boson production using tri-lepton final states in ppbar collisions at ?s = 1.96 TeV  

E-Print Network [OSTI]

analysis reports a measurement of the WZ ? l?l+l? cross section. Using 4.1 fb?1 of integrated luminosity, we measure a cross section of 3.90?0.85+1.01(stat+syst) 0.31(lumi) pb, which is found to be in good agreement with the standard model prediction...

McGivern, Carrie Lynne

2012-05-31T23:59:59.000Z

269

Search for the Standard Model Higgs Boson Decaying to W[superscript +]W[superscript -] in the Fully Leptonic Final State in pp Collisions at ?s = 7 TeV  

E-Print Network [OSTI]

A search for the standard model Higgs boson decaying to W[superscript +]W[superscript ?] in pp collisions at ?s = 7 TeV is reported. The data are collected at the LHC with the CMS detector, and correspond to an integrated ...

Alver, B.

270

Fiducial and differential cross sections of Higgs boson production measured in the four-lepton decay channel in pp collisions at ?s = 8 TeV with the ATLAS detector  

E-Print Network [OSTI]

Measurements of fiducial and differential cross sections of Higgs boson production in the H?ZZ*?4? decay channel are presented. The cross sections are determined within a fiducial phase space and corrected for detection ...

Taylor, Frank E.

271

Measurement of the W-boson helicity in top-quark decays from tt-bar production in lepton+jets events in pp collisions at s?=7 TeV  

E-Print Network [OSTI]

as the combined secondary-vertex (CSV) algorithm [26], is used to separate jets originating from light quarks (or gluons) and heavy quarks, i.e. charm or bottom quarks. Jets are first divided into cat- egories according to the probability of reconstructing a... measured value from the CSV tagger discriminant (see section 4). Since the top-quark and W-boson reconstructed masses are dominated by experimental resolu- tion effects, the parameters ?mt,t and ?M lep, hadW in eq. (5.1) are approximated as Gaussian widths...

Baringer, Philip S.; Bean, Alice; Benelli, Gabriele; Kenny, R. P. III; Murray, Michael J.; Noonan, Danny; Sanders, Stephen J.; Stringer, Robert W.; Wood, Jeffrey Scott; Chatrchyan, S.; Khachatryan, V.; Sirunyan, A. M.; Tumasyan, A.; Adam, W.; Bergauer, T.; Dragicevic, M.

2013-10-24T23:59:59.000Z

272

s025.dvi  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Heavy Heavy Charged Lepton Searches NODE=S025 Charged Heavy Lepton MASS LIMITS Charged Heavy Lepton MASS LIMITS Charged Heavy Lepton MASS LIMITS Charged Heavy Lepton MASS LIMITS NODE=S025205 Sequential Charged Heavy Lepton (L ± ) MASS LIMITS Sequential Charged Heavy Lepton (L ± ) MASS LIMITS Sequential Charged Heavy Lepton (L ± ) MASS LIMITS Sequential Charged Heavy Lepton (L ± ) MASS LIMITS NODE=S025MS These experiments assumed that a fourth generation L ± decayed to a fourth generation NODE=S025MS ν L (or L 0 ) where ν L was stable, or that L ± decays to a light ν ℓ via mixing. See the "Quark and Lepton Compositeness, Searches for" Listings for limits on radia- tively decaying excited leptons, i.e. ℓ ∗ → ℓ γ. See the "WIMPs and other Particle Searches" section for heavy charged particle search limits in which the charged particle could be a lepton. NODE=S025MS;CHECK

273

Decay channels and decay rates for the hydrogen-antihydrogen quasimolecule  

SciTech Connect (OSTI)

Calculations of leptonic and hadronic annihilation rates in the hydrogen-antihydrogen molecule are presented. Both the leptonic potential and leptonic wave function are evaluated within the Born-Oppenheimer approximation employing the Ritz variational principle. Nonadiabatic corrections to the leptonic potential are also obtained. Explicitly correlated Gaussians are employed as basis functions, which describe accurately the hydrogen-antihydrogen interaction. Given the leptonic potential the hadronic part of the wave function for each molecular level of the hydrogen-antihydrogen quasimolecule is calculated by solving the corresponding Schroedinger equation by means of precise B-spline representations. The decay rates of the quasimolecule into separate positronium and protonium systems are estimated for a number of molecular levels. Utilizing the leptonic and hadronic wave functions the leptonic- and hadronic-annihilation rates for different molecular levels are computed.

Labzowsky, L. [Institute of Physics, St. Petersburg State University, 198904, Uljanovskaya 1, Petrodvorets, St. Petersburg (Russian Federation); Petersburg Nuclear Physics Institute, 188350, Gatchina, St. Petersburg (Russian Federation); Sharipov, V. [Institute of Physics, St. Petersburg State University, 198904, Uljanovskaya 1, Petrodvorets, St. Petersburg (Russian Federation); Prozorov, A. [Institute of Physics, St. Petersburg State University, 198904, Uljanovskaya 1, Petrodvorets, St. Petersburg (Russian Federation); Max-Planck Institut fuer Physik Komplexer Systeme, Noethnitzerstrasse 38, D-01187, Dresden (Germany); Plunien, G.; Soff, G. [Technische Universitaet Dresden, Mommsenstrasse 13, D-01062, Dresden (Germany)

2005-08-15T23:59:59.000Z

274

Citation: K. Hagiwara  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Heavy Heavy Neutral Leptons, Searches for (A) Heavy Neutral Leptons (A) Heavy Neutral Leptons (A) Heavy Neutral Leptons (A) Heavy Neutral Leptons Stable Neutral Heavy Lepton MASS LIMITS Stable Neutral Heavy Lepton MASS LIMITS Stable Neutral Heavy Lepton MASS LIMITS Stable Neutral Heavy Lepton MASS LIMITS Note that LEP results in combination with REUSSER 91 exclude a fourth stable neutrino with m< 2400 GeV. VALUE (GeV) CL% DOCUMENT ID TECN COMMENT >45.0 >45.0 >45.0 >45.0 95 ABREU 92B DLPH Dirac >39.5 >39.5 >39.5 >39.5 95 ABREU 92B DLPH Majorana >44.1 95 ALEXANDER 91F OPAL Dirac >37.2 95 ALEXANDER 91F OPAL Majorana none 3-100 90 SATO 91 KAM2 Kamiokande II >42.8 95 1 ADEVA 90S L3 Dirac >34.8 95 1 ADEVA 90S L3 Majorana >42.7 95 DECAMP 90F ALEP Dirac 1 ADEVA 90S limits for the heavy neutrino apply if the mixing with the charged leptons satisfies U 1 j 2

275

s077.dvi  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Neutral Neutral Leptons, Searches for (A) Heavy Neutral Leptons (A) Heavy Neutral Leptons (A) Heavy Neutral Leptons (A) Heavy Neutral Leptons Stable Neutral Heavy Lepton MASS LIMITS Stable Neutral Heavy Lepton MASS LIMITS Stable Neutral Heavy Lepton MASS LIMITS Stable Neutral Heavy Lepton MASS LIMITS Note that LEP results in combination with REUSSER 91 exclude a fourth stable neutrino with m< 2400 GeV. VALUE (GeV) CL% DOCUMENT ID TECN COMMENT >45.0 >45.0 >45.0 >45.0 95 ABREU 92B DLPH Dirac >39.5 >39.5 >39.5 >39.5 95 ABREU 92B DLPH Majorana >44.1 95 ALEXANDER 91F OPAL Dirac >37.2 95 ALEXANDER 91F OPAL Majorana none 3-100 90 SATO 91 KAM2 Kamiokande II >42.8 95 1 ADEVA 90S L3 Dirac >34.8 95 1 ADEVA 90S L3 Majorana >42.7 95 DECAMP 90F ALEP Dirac 1 ADEVA 90S limits for the heavy neutrino apply if the mixing with the charged leptons satisfies U 1 j 2 + U 2

276

Multilepton signatures of gauge mediated SUSY breaking at CERN LEP II  

Science Journals Connector (OSTI)

In the framework of gauge-mediated supersymmetry breaking models, pair production of the lightest neutralinos, scalar leptons, or charginos at CERN LEP II gives rise to interesting signals involving multilepton final states and missing energy. In the parameter space where the scalar tau, ??1, is the next-to-lightest supersymmetric particle, we identify three interesting regions, which give rise to distinctly different final states: (i) 2 ?-leptons plus missing energy, (ii) 4 charged leptons plus missing energy, where in some regions all four are ?-leptons, or (iii) six charged leptons, of which four are ?-leptons and the other two are electrons or muons, plus missing energy. We study in detail the size of these regions in the parameter space of gauge-mediated models and give cross section contours in these regions for various LEP II energies. We also discuss the possibility of chargino-pair production at LEP II.

Kingman Cheung, Duane A. Dicus, B. Dutta, and S. Nandi

1998-06-08T23:59:59.000Z

277

Acceptance and resolution simulation studies for the dielectron spectrometer HADES at GSI  

E-Print Network [OSTI]

Design studies for a second generation Dilepton Spectrometer to be built at the SIS accelerator of GSI are presented. The basic design parameters of this system are specified and the different detector components for charged particle tracking and for lepton identification are described. The geometrical acceptance for lepton pairs is given. Results on single track momentum resolution and on lepton pair mass resolution are reported.

R. Schicker; A. Brenschede; K. Garrow; H. Schoen; A. Balanda; H. Bokemeyer; J. Friese; W. Karig; P. Kienle; W. Koenig; W. Kuehn; F. Lefevre; V. Metag; G. Roche; P. Salabura; A. Schroeter; J. Stroth; H. Tsertos

1996-05-21T23:59:59.000Z

278

s077.dvi  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Heavy Heavy Neutral Leptons, Searches for NODE=S077 (A) Heavy Neutral Leptons (A) Heavy Neutral Leptons (A) Heavy Neutral Leptons (A) Heavy Neutral Leptons NODE=S077245 Stable Neutral Heavy Lepton MASS LIMITS Stable Neutral Heavy Lepton MASS LIMITS Stable Neutral Heavy Lepton MASS LIMITS Stable Neutral Heavy Lepton MASS LIMITS NODE=S077340 Note that LEP results in combination with REUSSER 91 exclude a fourth NODE=S077340 stable neutrino with m< 2400 GeV. NODE=S077MNS;CHECK LIMITS VALUE (GeV) CL% DOCUMENT ID TECN COMMENT >45.0 >45.0 >45.0 >45.0 95 ABREU 92B DLPH Dirac OCCUR=2 >39.5 >39.5 >39.5 >39.5 95 ABREU 92B DLPH Majorana >44.1 95 ALEXANDER 91F OPAL Dirac OCCUR=2 >37.2 95 ALEXANDER 91F OPAL Majorana none 3-100 90 SATO 91 KAM2 Kamiokande II >42.8 95 1 ADEVA 90S L3 Dirac OCCUR=2 >34.8 95 1 ADEVA 90S L3 Majorana >42.7 95 DECAMP 90F ALEP Dirac

279

SLAC-PUB-2446  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

2446 2446 December 1979 (T/E) THE TAU LEPTON" Martin L. Per1 Stanford Linear Accelerator Center Stanford University, Stanford, California 94305 U.S.A. Submitted to Annual Review of Nuclear and Particle Science * Work supported by the Department of Energy, contract DE-AC03-76SF00515. TAU LEPTON TABLE OF CONTENTS -2- -1. SI INTRODUCTION 1.1 The Definition of a Lepton 1.2 The Tau Lepton 2. THEORETICAL FRAMEWORK 2.1 2.2 2.3 2.4 Weak Interactions and Lepton Conservation Simple Models for New Charged Leptons 2.2.1 SEQUENTIAL LEPTON MODEL 2.2.2 ORTHOLEPTON MODEL 2.2.3 PARALEPTON MODEL e-p- T Universality Leptons and Quarks 3. THE IDENTIFICATION OF THE TAU AS A LEPTON 3.1 Decay Process Signatures 3.2 e+e- Production Process Signatures 3.2.1 THEORY 3.2.2 EXPERIMENTAL RESULTS BELOW 8 GeV

280

Challenges in Accelerator Beam Instrumentation  

SciTech Connect (OSTI)

The challenges in beam instrumentation and diagnostics for present and future particle accelerator projects are presented. A few examples for advanced hadron and lepton beam diagnostics are given.

Wendt, M.

2009-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "leptons leptons leptons" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


281

Bringing the Higgs Boson to Rest.  

E-Print Network [OSTI]

??Within the Standard Model of particle physics, the Higgs boson can decay to a pair of W bosons which decay leptonically. Despite its relatively large (more)

van Nieuwkoop, Koos

2013-01-01T23:59:59.000Z

282

A Search for the Standard Model Higgs Boson Produced in Association with Top Quarks.  

E-Print Network [OSTI]

??We have performed a search for the Standard Model Higgs boson produced in association with top quarks in the lepton plus jets channel. We impose (more)

Wilson, Jonathan S.

2012-01-01T23:59:59.000Z

283

Evidence for a Higgs boson in tau decays with the CMS detector .  

E-Print Network [OSTI]

??In this thesis, I describe the search for a Higgs boson through its decay to a pair of tan leptons with the tau-pair subsequently decaying (more)

Dutta, Valentina

2014-01-01T23:59:59.000Z

284

A search for dark matter through invisible decays of the Higgs boson with the ATLAS detector at the LHC.  

E-Print Network [OSTI]

??Diboson physics provides insight into a wide variety of processes that are produced copiously at the LHC. Of particular interest are events where leptons and (more)

Kunkle, Joshua Milo

2013-01-01T23:59:59.000Z

285

E-Print Network 3.0 - anti nu discrepancy Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Energy Efficiency and Renewable Energy, Building Energy Efficiency Program Collection: Energy Storage, Conversion and Utilization 52 Search for the Lepton Number Violating...

286

Constraints on Non-Standard Neutrino Interactions and Unparticle Physics with Neutrino-Electron Scattering at the Kuo-Sheng Nuclear Power Reactor  

E-Print Network [OSTI]

Neutrino-electron scatterings are purely leptonic processes with robust Standard Model (SM) predictions. Their measurements can therefore provide constraints to physics beyond SM. The $\

M. Deniz er al.; TEXONO Collaboration

2010-06-10T23:59:59.000Z

287

Constraints on Non-Standard Neutrino Interactions and Unparticle Physics with Neutrino-Electron Scattering at the Kuo-Sheng Nuclear Power Reactor  

E-Print Network [OSTI]

Neutrino-electron scatterings are purely leptonic processes with robust Standard Model (SM) predictions. Their measurements can therefore provide constraints to physics beyond SM. The $\

al., M Deniz er

2010-01-01T23:59:59.000Z

288

Testable constraint on near-tribimaximal neutrino mixing  

E-Print Network [OSTI]

General lowest order perturbations to hermitian squared mass matrices of leptons are considered away from the tribimaximal (TBM) limit in which a weak flavor basis with mass diagonal charged leptons is chosen. The three measurable TBM-deviants are expressed linearly in terms of perturbation induced dimensionless coefficients appearing in the charged lepton and neutrino flavor eigenstates. With unnatural cancellations assumed to be absent and the charged lepton perturbation contributions to their flavor eigenstates argued to be small, we analytically derive that a deviation from maximal atmospheric neutrino mixing and CP violation in neutrino oscillations cannot both be observably large, posing the challenge of verification to forthcoming experiments at the intensity frontier.

Brahmachari, Biswajoy

2014-01-01T23:59:59.000Z

289

Testable constraint on near-tribimaximal neutrino mixing  

E-Print Network [OSTI]

General lowest order perturbations to hermitian squared mass matrices of leptons are considered away from the tribimaximal (TBM) limit in which a weak flavor basis with mass diagonal charged leptons is chosen. The three measurable TBM-deviants are expressed linearly in terms of perturbation induced dimensionless coefficients appearing in the charged lepton and neutrino flavor eigenstates. With unnatural cancellations assumed to be absent and the charged lepton perturbation contributions to their flavor eigenstates argued to be small, we analytically derive that a deviation from maximal atmospheric neutrino mixing and CP violation in neutrino oscillations cannot both be observably large, posing the challenge of verification to forthcoming experiments at the intensity frontier.

Biswajoy Brahmachari; Probir Roy

2014-07-20T23:59:59.000Z

290

Measurements of semileptonic branching fractions of B mesons at the ?(4S) resonance  

E-Print Network [OSTI]

. Hadrons misidentified as leptons are called "fake" lep- tons. For electron sample A, the probability of misiden- tifying a. hadron as an electron (fake probability) was determined using T(1S) events. For sample B, the fake probability was determined using... lepton yield above 1.4 GeV/c. As described below, models that differ greatly in the way they treat quark hadronization are all successful in predicting the b ~ c/v lepton spectrum. (ii) Secondary leptons The .second component is lep- tons from...

Baringer, Philip S.

1992-04-01T23:59:59.000Z

291

Flavor S_4 times Z_2 symmetry and neutrino mixing  

E-Print Network [OSTI]

We present a model of the lepton masses and flavor mixing based on the discrete group $S_4 \\times Z_2$. In this model, all the charged leptons and neutrinos are assigned to the $3_\\alpha$ representation of $S_4$ in the Yamanouchi bases. The charged lepton and neutrino masses are mainly determined by the vacuum expectation value structures of the Higgs fields. A nearly tri-bimaximal lepton flavor mixing pattern, which is in agreement with the current experimental results, can be accommodated in our model. The neutrino mass spectrum takes the nearly degenerate pattern, and thus can be well tested in the future precise experiments.

He Zhang

2006-12-18T23:59:59.000Z

292

Muon-Induced Backgrounds in the Double Chooz Neutrino Oscillation Experiment  

E-Print Network [OSTI]

for neutrinoless double-beta decay, a lepton-number violating nuclear process. The observation of a non-zero rate

293

Muon-Muon and Other High Energy Colliders  

Science Journals Connector (OSTI)

Before we discuss the muon collider in detail, it is useful to...(pp, $$p\\bar p$$ ), of lepton (e + e ...

R. B. Palmer; J. C. Gallardo

1997-01-01T23:59:59.000Z

294

The Discovery of the Tau and Its Major Properties: 1970--1985  

DOE R&D Accomplishments [OSTI]

This paper recounts the history of the discovery of the tau lepton and its major properties: its mass, its lifetime and its main decay modes.

Perl, M. L.

1990-09-00T23:59:59.000Z

295

E-Print Network 3.0 - antileptons Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

List Advanced Search Sample search results for: antileptons Page: << < 1 2 3 4 5 > >> 1 LHCCMS Journal Club November 30, 2005 Summary: Lepton Underlying Event Underlying Event...

296

SciTech Connect: An Effective Theory of Dirac Dark Matter  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

LEPTONS; NONLUMINOUS MATTER; POSITRONS; QUARKS; SPECTRA; UNIVERSE Astrophysics, Phenomenology-HEP,HEPPH, HEPTH Word Cloud More Like This Full Text preview image File size N...

297

mxxx005-tab.dvi  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

- - 0.008 π - modes are charge conjugates of the modes below. For decay limits to particles which are not established, see the section on Searches for Axions and Other Very Light Bosons. p π + DECAY MODES π + DECAY MODES π + DECAY MODES π + DECAY MODES Fraction (Γ i /Γ) Confidence level (MeV /c) µ + ν µ [b] (99.98770± 0.00004) % 30 µ + ν µ γ [c] ( 2.00 ± 0.25 ) × 10 -4 30 e + ν e [b] ( 1.230 ± 0.004 ) × 10 -4 70 e + ν e γ [c] ( 7.39 ± 0.05 ) × 10 -7 70 e + ν e π 0 ( 1.036 ± 0.006 ) × 10 -8 4 e + ν e e + e - ( 3.2 ± 0.5 ) × 10 -9 70 e + ν e ν ν < 5 × 10 -6 90% 70 Lepton Family number (LF) or Lepton number (L) violating modes Lepton Family number (LF) or Lepton number (L) violating modes Lepton Family number (LF) or Lepton number (L) violating modes Lepton Family number (LF) or Lepton number (L) violating modes µ + ν e L [d] < 1.5 × 10 -3 90% 30 µ + ν e LF [d] < 8.0 × 10 -3 90% 30 µ - e + e + ν LF < 1.6 × 10 -6 90% 30 HTTP://PDG.LBL.GOV

298

mxxx005-sumtab.dvi  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

- 0.008 π - modes are charge conjugates of the modes below. For decay limits to particles which are not established, see the section on Searches for Axions and Other Very Light Bosons. p π + DECAY MODES π + DECAY MODES π + DECAY MODES π + DECAY MODES Fraction (Γ i /Γ) Confidence level (MeV /c) µ + ν µ [b] (99.98770± 0.00004) % 30 µ + ν µ γ [c] ( 2.00 ± 0.25 ) × 10 -4 30 e + ν e [b] ( 1.230 ± 0.004 ) × 10 -4 70 e + ν e γ [c] ( 7.39 ± 0.05 ) × 10 -7 70 e + ν e π 0 ( 1.036 ± 0.006 ) × 10 -8 4 e + ν e e + e - ( 3.2 ± 0.5 ) × 10 -9 70 e + ν e ν ν < 5 × 10 -6 90% 70 Lepton Family number (LF) or Lepton number (L) violating modes Lepton Family number (LF) or Lepton number (L) violating modes Lepton Family number (LF) or Lepton number (L) violating modes Lepton Family number (LF) or Lepton number (L) violating modes µ + ν e L [d] < 1.5 × 10 -3 90% 30 µ + ν e LF [d] < 8.0 × 10 -3 90% 30 µ - e + e + ν LF < 1.6 × 10 -6 90% 30 π 0 π

299

Scou%ng Hazardous Environments With Thermal Imaging Ryan Stevenson, Josh Kay, Azim Muqtadir  

E-Print Network [OSTI]

of 12 FLIR Lepton Cameras, an accelerometer, a RN-XV WiFly Module, a Tiva C-Ion BaXery RN-XV WiFi I2C UART Hardware FLIR Lepton Thermal Camera and thermal cameras in the device and then use FLIRs MSX blending algorithm to give

Liebling, Michael

300

International Europhysics Conference on High Energy Physics EPS, July 17th-23rd 2003 in Aachen, Germany  

E-Print Network [OSTI]

International Europhysics Conference on High Energy Physics EPS, July 17th-23rd 2003 in Aachen, Germany General Search for New Phenomena in ep Scattering at HERA M. Wessels I. Physikalisches Institut lepton and multi-lepton events Have we missed something? General Search for New Phenomena in ep

Note: This page contains sample records for the topic "leptons leptons leptons" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


301

Searching for New Physics at SuperB - The Super Flavor Factory  

ScienceCinema (OSTI)

SuperB ? a Super Flavor Factory, an electron-positron collider with a luminosity of 1036 cm-2 s-1, can conduct conduct unique sensitive searches for New Physics effects such as lepton flavor violation and new sources of CP violation in the quark and lepton sectors.

David Hitlin

2010-01-08T23:59:59.000Z

302

Search for neutrinoless tau decays involving pi(0) or eta mesons  

E-Print Network [OSTI]

We have searched for lepton flavor violating decays of the tau lepton using final states with an electron Or a muon and one or two pi(0) or eta mesons but no neutrinos. The data used in the search were collected with the CLEO II detector...

Ammar, Raymond G.; Baringer, Philip S.; Bean, Alice; Besson, David Zeke; Coppage, Don; Darling, C.; Davis, Robin E. P.; Hancock, N.; Kotov, S.; Kravchenko, I.; Kwak, Nowhan

1997-08-01T23:59:59.000Z

303

Particle Data Group - 2013 Particle Listings  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

. . and 2013 partial update for the 2014 edition. Cut-off date for this update was January 15, 2013. GAUGE AND HIGGS BOSONS (gamma, g, W, Z, ...) gamma g (gluon) graviton W boson Z boson Higgs Bosons (H0 and H+-) Heavy Bosons, Other Than Higgs Bosons, Searches for (rev.) Axions (A0) and Other Very Light Bosons, Searches for (rev.) Collapse Gauge and Higgs Boson table LEPTONS (e, mu, tau, neutrinos, heavy leptons ...) electron muon tau Heavy Charged Lepton Searches Introduction to the Neutrino Properties Listings (rev.) Neutrino Properties Number of Neutrino Types Double-beta Decay Note on Neutrinoless Double-beta Decay (rev.) Introduction to Three-Neutrino Mixing Parameters Listings Neutrino Mixing (rev.) Heavy Neutral Leptons, Searches for Collapse Leptons table QUARKS (u, d, s, c, b, t, ...)

304

Particle Data Group - 2010 Particle Listings  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

GAUGE AND HIGGS BOSONS (gamma, g, W, Z, ...) gamma g (gluon) graviton W boson Z boson Higgs Bosons (H0 and H+-), Searches for Heavy Bosons, Other Than Higgs Bosons, Searches for Axions (A0) and Other Very Light Bosons, Searches for Collapse Gauge and Higgs Boson table LEPTONS (e, mu, tau, neutrinos, heavy leptons ...) electron muon tau Heavy Charged Lepton Searches Introduction to the Neutrino Properties Listings Neutrino Properties Number of Neutrino Types Double-beta Decay Note on Neutrinoless Double-beta Decay Introduction to Three-Neutrino Mixing Parameters Listings Neutrino Mixing Heavy Neutral Leptons, Searches for Collapse Leptons table QUARKS (u, d, s, c, b, t, ...) Note on the Quark Masses LIGHT QUARKS --- u, d, s c quark b quark t quark b' quark (4**th Generation)

305

Particle Data Group - 2012 Particle Listings  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Cut-off date for this update was January 15, 2012. Cut-off date for this update was January 15, 2012. GAUGE AND HIGGS BOSONS (gamma, g, W, Z, ...) gamma g (gluon) graviton W boson Z boson Higgs Bosons (H0 and H+-), Searches for Heavy Bosons, Other Than Higgs Bosons, Searches for (rev.) Axions (A0) and Other Very Light Bosons, Searches for (rev.) Collapse Gauge and Higgs Boson table LEPTONS (e, mu, tau, neutrinos, heavy leptons ...) electron muon tau Heavy Charged Lepton Searches Introduction to the Neutrino Properties Listings (rev.) Neutrino Properties Number of Neutrino Types Double-beta Decay Note on Neutrinoless Double-beta Decay (rev.) Introduction to Three-Neutrino Mixing Parameters Listings Neutrino Mixing (rev.) Heavy Neutral Leptons, Searches for Collapse Leptons table QUARKS (u, d, s, c, b, t, ...) Note on the Quark Masses (rev.)

306

Particle Data Group - 2008 Particle Listings  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

GAUGE AND HIGGS BOSONS (gamma, g, W, Z, ...) gamma g (gluon) graviton W boson Z boson Higgs Bosons (H0 and H+-), Searches for Heavy Bosons, Other Than Higgs Bosons, Searches for Axions (A0) and Other Very Light Bosons, Searches for Collapse Gauge and Higgs Boson table LEPTONS (e, mu, tau, neutrinos, heavy leptons ...) electron muon tau Heavy Charged Lepton Searches Introduction to the Neutrino Properties Listings Neutrino Properties Number of Neutrino Types Double-beta Decay Note on Neutrinoless Double-beta Decay Neutrino Mixing Solar Neutrinos Review Heavy Neutral Leptons, Searches for Collapse Leptons table QUARKS (u, d, s, c, b, t, ...) Note on the Quark Masses LIGHT QUARKS --- u, d, s c quark b quark t quark b' quark (4**th Generation) t' quark (4**th Generation) Free Quark Searches

307

Diboson Production at D0  

SciTech Connect (OSTI)

We present recent diboson production measurements from the D0 experiment at Fermilab's Tevatron collider. The production of ZZ was observed using leptonic final states. Z{gamma} {yields} vv{gamma} was observed and used to set the most stringent limits from a hadron collider on anomalous Z{gamma}{gamma} and ZZ{gamma} trilinear gauge couplings (TGCs). WW events with leptonic final states and WW + WZ events with semi-leptonic final states were used to set limits on anomalous WWZ and WW{gamma} TGCs. Finally, limits on anomalous WWZ and WW{gamma} TGCs were obtained from a combination of the fully-leptonic W{gamma}, WW, and WZ channels and the semi-leptonic WW and WZ channels, giving the most stringent limits from a hadron collider.

Haley, Joseph; /Princeton U.

2009-10-01T23:59:59.000Z

308

neutrino_mixing_s805.dvi  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

NEUTRINO NEUTRINO PHYSICS AS EXPLORED BY FLAVOR CHANGE Written May 2002 by B. Kayser (Fermilab). I. The physics of flavor change: The rather convincing evidence that atmospheric neutrinos change from one flavor to another has now been joined by new, very strong evidence that the solar neutrinos do this as well. Neutrino flavor change implies that neutrinos have nonzero masses. That is, there is a spectrum of three or more neutrino mass eigenstates, ν 1 , ν 2 , ν 3 , . . ., that are the analogues of the charged-lepton mass eigenstates, e, µ, and τ . Neutrino flavor change also implies leptonic mixing. That is, the weak interaction coupling the W boson to a charged lepton and a neutrino can couple any charged-lepton mass eigenstate α to any neutrino mass eigenstate ν i . Here, α = e, µ, or τ , and e is the electron, etc. Leptonic W + decay can yield a particular + α in association with any ν i . The amplitude

310

Rydberg states of the hydrogen-antihydrogen quasimolecule  

SciTech Connect (OSTI)

A description of the excited lepton states of the hydrogen-antihydrogen quasimolecule is presented. Potential energy curves and the leptonic part of the wave functions corresponding to a variety of such states are calculated within the Born-Oppenheimer approximation employing the Ritz variational principle. Nonadiabatic corrections to the leptonic potentials are also obtained. Basis functions are constructed as products of explicitly correlated Gaussians and spherical harmonics which describe correctly the motion of leptons with arbitrary orbital angular momentum projection onto the molecular (internuclear) axis. The hadronic part of the wave function for each leptonic level of the hydrogen-antihydrogen system is calculated by solving the Schroedinger equation with the obtained leptonic potentials. Corresponding solutions are generated utilizing precise B-spline representations. Employing leptonic and hadronic parts of the wave function the electron-positron and proton-antiproton annihilation rates are computed for a number of quasimolecular states. The decay rates of the hydrogen-antihydrogen system into separate positronium and protonium atoms are also estimated for the quasimolecular levels under consideration.

Sharipov, V. [Institute of Physics, St. Petersburg State University, 198904, Uljanovskaya 1, Petrodvorets, St. Petersburg (Russian Federation); Labzowsky, L. [Institute of Physics, St. Petersburg State University, 198904, Uljanovskaya 1, Petrodvorets, St. Petersburg (Russian Federation); Petersburg Nuclear Physics Institute, 188350, Gatchina, St. Petersburg (Russian Federation); Max-Planck Institut fuer Physik komplexer Systeme, Noethnitzerstrasse 38, D-01187 Dresden (Germany); Plunien, G. [Technische Universitaet Dresden, Mommsenstrasse 13, D-01062, Dresden (Germany)

2006-05-15T23:59:59.000Z

311

Left-Right Symmetry and the Charged Higgs Bosons at the LHC  

E-Print Network [OSTI]

The charged Higgs boson sector of the Minimal Manifest Left-Right Symmetric model (MLRSM) is investigated in the context of LHC discovery search for new physics beyond Standard Model. We discuss and summarise the main processes within MLRSM where heavy charged Higgs bosons can be produced at the LHC. We explore the scenarios where the amplified signals due to relatively light charged scalars dominate against heavy neutral $Z_2$ and charged gauge $W_2$ as well as heavy neutral Higgs bosons signals which are dumped due to large vacuum expectation value $v_R$ of the right-handed scalar triplet. In particular, production processes with one and two doubly charged Higgs bosons are considered. We further incorporate the decays of those scalars leading to multi lepton signals at the LHC. Branching ratios for heavy neutrino $N_R$, $W_2$ and $Z_2$ decay into charged Higgs bosons are calculated. These effects are substantial enough and cannot be neglected. The tri- and four-lepton final states for different benchmark points are analysed. Kinematic cuts are chosen in order to strength the leptonic signals and decrease the Standard Model (SM) background. The results are presented using di-lepton invariant mass and lepton-lepton separation distributions for the same sign (SSDL) and opposite sign (OSDL) di-leptons as well as the charge asymmetry are also discussed. We have found that for considered MLRSM processes tri-lepton and four-lepton signals are most important for their detection when compared to the SM background. Both of the signals can be detected at 14 TeV collisions at the LHC with integrated luminosity at the level of $300 fb^{-1}$ with doubly charged Higgs bosons up to approximately 600 GeV. Finally, possible extra contribution of the charged MLRSM scalar particles to the measured Higgs to di-photon ($H_0^0 \\to \\gamma \\gamma$) decay is computed and pointed out.

G. Bambhaniya; J. Chakrabortty; J. Gluza; M. Kordiaczynska; R. Szafron

2014-04-15T23:59:59.000Z

312

Search for Supersymmetry in the Dilepton Final State with Taus at CDF Run II  

SciTech Connect (OSTI)

This thesis presents the results a search for chargino and neutralino supersymmetric particles yielding same signed dilepton final states including one hadronically decaying tau lepton using 6.0 fb{sup -1} of data collected by the the CDF II detector. This signature is important in SUSY models where, at high tan {beta}, the branching ratio of charginos and neutralinos to tau leptons becomes dominant. We study event acceptance, lepton identification cuts, and efficiencies. We set limits on the production cross section as a function of SUSY particle mass for certain generic models.

Forrest, Robert David; /California U., Davis

2011-09-01T23:59:59.000Z

313

A research Program in Elementary Particle Physics  

SciTech Connect (OSTI)

Work is reported in: Neutrino Physics, Cosmic Rays and Elementary Particles; Particle Physics and Charged Lepton Flavor Violation; Research in Collider Physics; Dark Energy Studies with BOSS and LSST.

Sobel, Henry; Molzon, William; Lankford, Andrew; Taffard, Anyes; Whiteson, Daniel; Kirkby, David

2013-07-25T23:59:59.000Z

314

Leptin acts centrally to induce the prepubertal secretion of luteinizing hormone in the female rat: a potential early role in the pubertal process  

E-Print Network [OSTI]

in controlling LH secretion during late juvenile and peripubertal development, hence contributing to hypothalamic-pituitary function during sexual maturation. Therefore, this study was conducted to determine if lepton is capable of stimulating LH release during...

Dearth, Robert Keith

1999-01-01T23:59:59.000Z

315

Resource Letter: SM-1: The standard model and beyond  

Science Journals Connector (OSTI)

This Resource Letter provides a guide to literature on the standard model of elementary particles and possible extensions. In the successful theory of quarks and leptons and their interactions important questions remain such as the mechanism of electroweak symmetry breaking the origin of quark and lepton masses the source of the baryon asymmetry of the Universe and the makeup of its matter and energy density. References are cited for quarks and leptons gauge theories color and chromodynamics weak interactions electroweak unification CP violation dynamics of heavy quarks Higgs bosons precision electroweak measurements supersymmetry dynamical electroweak symmetry breaking composite quarks and leptons grand unification and extended gauge groups string theories large extra dimensions neutrino masses cosmic microwave background radiation dark matter dark energy accelerator facilities and non-accelerator experiments.

Jonathan L. Rosner

2003-01-01T23:59:59.000Z

316

A measurement of open charm using single muons at forward angles for p+p collisions at center of mass energy 200 GeV.  

E-Print Network [OSTI]

??This dissertation presents the measurement of single muons from the semi-leptonic decay of heavy quark mesons (charm and bottom) in ?s=200 GeV p+p collisions at (more)

Hornback, Donald Eric

2008-01-01T23:59:59.000Z

317

Search for physics beyond the standard model using multilepton signatures in pp collisions at ?s = 7 TeV  

E-Print Network [OSTI]

A search for physics beyond the standard model in events with at least three leptons and any number of jets is presented. The data sample corresponds to 35 pb[superscript ?1] of integrated luminosity in pp collisions at ...

Alver, Burak Han

318

Iodine molecule for neutrino mass spectroscopy: ab initio calculation of spectral rate  

Science Journals Connector (OSTI)

......such as tritium for the measurement of an averaged absolute neutrino mass value, and (2) the search of neutrinoless double beta decay for verification of lepton number violation related to a finite Majorana type of masses. So far negative......

Motomichi Tashiro; Masahiro Ehara; Susumu Kuma; Yuki Miyamoto; Noboru Sasao; Satoshi Uetake; Motohiko Yoshimura

2014-01-01T23:59:59.000Z

319

Seminar_fall_2010.ppt  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Oscillation Results from MiniBooNE & Possible CP Violation in the Lepton Sector W.C. Louis Los Alamos National Laboratory October 19, 2010 2 Outline Introduction LSND ...

320

Future directions in particle and nuclear physics at multi-GeV hadron beam facilities  

SciTech Connect (OSTI)

This report contains papers on the following topics in particle and nuclear physics: hadron dynamics; lepton physics; spin physics; hadron and nuclear spectroscopy; hadronic weak interactions; and Eta physics. These papers have been indexed separately elsewhere.

Geesaman, D.F. [Argonne National Lab., IL (United States)] [ed.

1993-11-01T23:59:59.000Z

Note: This page contains sample records for the topic "leptons leptons leptons" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


321

Search for the Standard Model Higgs Boson Produced in Association with a Z Boson in the Electron-Muon Final State and the Higgs Boson Decaying into Bottom Quarks.  

E-Print Network [OSTI]

??A search for the standard model Higgs boson is presented in the associated production channel Z(??)H(bb) where each tau decays leptonically, one to an electron, (more)

Bartek, Rachel A.

2013-01-01T23:59:59.000Z

322

Search for H ? ?? produced in association with top quarks and constraints on the Yukawa coupling between the top quark and the Higgs boson using data taken at 7 TeV and 8 TeV with the ATLAS detector  

E-Print Network [OSTI]

A search is performed for Higgs bosons produced in association with top quarks using the diphoton decay mode of the Higgs boson. Selection requirements are optimized separately for leptonic and fully hadronic final states ...

Taylor, Frank E.

323

Kaons - Recent Results and Future Plans  

E-Print Network [OSTI]

Recent results and future plans of kaon physics are reviewed. Topics include CP violation, rare decays, light neutral-boson search, lepton flavor universality, and CPT and QM tests.

T. K. Komatsubara

2010-06-22T23:59:59.000Z

324

Search for R-parity violating supersymmetry in two-muon and four-jet topologies  

E-Print Network [OSTI]

We present results of a search for R-parity-violating decay of the neutralino (?) over tilde (0)(1), taken as the lightest supersymmetric particle, to a muon and two jets. The decay proceeds through a lepton-number ...

Baringer, Philip S.; Bean, Alice; Coppage, Don; Hebert, C.

2002-10-01T23:59:59.000Z

325

Constrained analytical interrelations in neutrino mixing  

E-Print Network [OSTI]

Hermitian squared mass matrices of charged leptons and light neutrinos in the flavor basis are studied under general additive lowest order perturbations away from the tribimaximal (TBM) limit in which a weak basis with mass diagonal charged leptons is chosen. Simple analytical expressions are found for the three measurable TBM-deviants in terms of perturbation parameters appearing in the neutrino and charged lepton eigenstates in the flavor basis. Taking unnatural cancellations to be absent and charged lepton perturbation parameters to be small, constrained analytical and testable interrelations are derived among neutrino masses, mixing angles and the amount of CP-violation, posing the challenge of verification to forthcoming experiments at the intensity frontier.

Brahmachari, Biswajoy

2014-01-01T23:59:59.000Z

326

Constrained analytical interrelations in neutrino mixing  

E-Print Network [OSTI]

Hermitian squared mass matrices of charged leptons and light neutrinos in the flavor basis are studied under general additive lowest order perturbations away from the tribimaximal (TBM) limit in which a weak basis with mass diagonal charged leptons is chosen. Simple analytical expressions are found for the three measurable TBM-deviants in terms of perturbation parameters appearing in the neutrino and charged lepton eigenstates in the flavor basis. Taking unnatural cancellations to be absent and charged lepton perturbation parameters to be small, constrained analytical and testable interrelations are derived among neutrino masses, mixing angles and the amount of CP-violation, posing the challenge of verification to forthcoming experiments at the intensity frontier.

Biswajoy Brahmachari; Probir Roy

2014-03-09T23:59:59.000Z

327

Review of Particle Physics  

Science Journals Connector (OSTI)

This biennial Review summarizes much of Particle Physics. Using data from previous editions, plus 1600 new measurements from 550 papers, we list, evaluate, and average measured properties of gauge bosons, leptons...

1998-01-01T23:59:59.000Z

328

An improved measurement of electroweak couplings frome + e ??e + e ? ande + e ??? + ? ?  

Science Journals Connector (OSTI)

We present an analysis of electroweak leptonic couplings from high statistics experiments on Bhabha scattering and ? pair production at an energy of 34.5 GeV. The forward-backward charge asymmetry of the ? pai...

M. Althoff; W. Braunschweig

1984-01-01T23:59:59.000Z

329

E-Print Network 3.0 - atlfast ii validierung Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Atlfast+AtlfastC Early Physics: Minimum bias and di-lepton measurements Fast Simulation Software 1... Nchd full simulation Atlfast Atlfast+AtlfastC Drell Yan L(fb-1) MZ' (GeV)...

330

SUSY Phenomenology  

E-Print Network [OSTI]

Three topics on phenomenology in supersymmetric models are reviewed, namely, the Higgs sector in the supersymmetric model, B and K meson decay in the supergravity model and lepton flavor violation processes in supersymmetric grand unified theory.

Yasuhiro Okada

1998-11-28T23:59:59.000Z

331

bbx and W??? backgrounds for the UA1 monojet signal  

Science Journals Connector (OSTI)

Backgrounds from W??? and bbx, via the leptonic decay channel Bc???, may account for three out of the five UA1 monojet events with ?EM>40 GeV.

R. Odorico

1985-12-01T23:59:59.000Z

332

Longitudinal double-spin asymmetry and cross section for inclusive neutral pion production in polarized proton collisions at [the square root of sigma] = 200 GeV.  

E-Print Network [OSTI]

Twenty years of polarized lepton-nucleon scattering experiments have found that the contribution from quark spins (1/2[delta] [sigma]) to the spin of the proton is only ~ 35%. This has lead researchers to look elsewhere, ...

Hoffman, Alan Michael

2009-01-01T23:59:59.000Z

333

Submitted to the International Conference on High Energy Physics  

E-Print Network [OSTI]

of rare lepton and meson decay, muon-electron conversion on nuclei, etc. [10]; nevertheless HERA has in this analysis is given: the central track- ing detector (CTD) [13], the uranium-scintillator calorimeter (CAL

334

Fermilab | Science | Particle Physics 101  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Today, we know that there are six leptons, six quarks, four force carriers and a Higgs boson. Scientists all over the world predicted the existence of these particles and then...

335

Physics Letters B 557 (2003) 167175 www.elsevier.com/locate/npe  

E-Print Network [OSTI]

.L. on the lifetime for neutrinoless double beta decay of 130Te. In terms of effective neutrino mass this leads lepton violating decays of 130Te and on the neutrinoless double beta decay of 128Te to the ground state

336

arXiv:0706.1732v2[hep-ph]11Jul2007 NUHEP-TH/07-06 GeV Seesaw, Accidentally Small Neutrino Masses, and Higgs Decays to Neutrinos  

E-Print Network [OSTI]

mixing and will provide important input for interpretation of next-generation neutrinoless double beta decay experiments. Measurement of the mass hierarchy is important input to the search for leptonic CP

337

PHYSICAL REVIEW C 89, 064308 (2014) Chiral two-body currents and neutrinoless double-decay in the quasiparticle  

E-Print Network [OSTI]

, then lepton number conservation violating processes could be observable (e.g. the neutrinoless double beta decay discussed in x 3 and the #23; ! #23; \\oscillations"). Massive Majorana neutrinos have #22; #23

Engel, Jonathan

338

E-Print Network 3.0 - active-sterile neutrino mixing Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Collection: Physics 4 arXiv:hep-ph0608147v113Aug2006 NUHEP-TH06-06 Neutrino Phenomenology of Very Low-Energy Seesaws Summary: , related via the standard lepton mixing...

339

B Physics Results From CLEO  

E-Print Network [OSTI]

We present results on lepton energy and recoil hadronic mass moments in semileptonic B decay using a total of 9.4 fb^-1 of data taken with the CLEO detector at the \\Upsilon(4S). These results are discussed in the context of Heavy Quark Effective Theory and compared to theory predictions as a function of the minimum lepton energy requirement. We also measure the B semileptonic branching fraction, B(B\\to Xe^+\

M. R. Shepherd

2004-05-17T23:59:59.000Z

340

arXiv:hep-ph/0611168v113Nov2006 SI-HEP-2006-15  

E-Print Network [OSTI]

arXiv:hep-ph/0611168v113Nov2006 SI-HEP-2006-15 November 13, 2006 Inclusive Semi-leptonic B Decays orders in the 1/mb expansion in inclusive semi-leptonic decays at tree level. We reproduce the known 1/m3 b terms and compute the 1/m4 b terms at tree level. The appearing non-perturbative parameters

Siegen, Universität

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341

Transverse polarization of $\\Lambda$ hyperons from quasi-real photoproduction on nuclei  

E-Print Network [OSTI]

The transverse polarization of $\\Lambda$ hyperons was measured in inclusive quasi-real photoproduction for various target nuclei ranging from hydrogen to xenon. The data were obtained by the HERMES experiment at HERA using the 27.6 GeV lepton beam and nuclear gas targets internal to the lepton storage ring. The polarization observed is positive for light target nuclei and is compatible with zero for krypton and xenon.

Airapetian, A; Akopov, Z; Aschenauer, E C; Augustyniak, W; Avakian, R; Avetissian, A; Avetisyan, E; Belostotski, S; Bianchi, N; Blok, H P; Borissov, A; Bowles, J; Brodski, I; Bryzgalov, V; Burns, J; Capiluppi, M; Capitani, G P; Cisbani, E; Ciullo, G; Contalbrigo, M; Dalpiaz, P F; Deconinck, W; De Leo, R; De Nardo, L; De Sanctis, E; Diefenthaler, M; Di Nezza, P; Dren, M; Ehrenfried, M; Elbakian, G; Ellinghaus, F; Fabbri, R; Fantoni, A; Felawka, L; Frullani, S; Gabbert, D; Gapienko, G; Gapienko, V; Garibaldi, F; Gavrilov, G; Gharibyan, V; Giordano, F; Gliske, S; Golembiovskaya, M; Hadjidakis, C; Hartig, M; Hasch, D; Hillenbrand, A; Hoek, M; Holler, Y; Hristova, I; Imazu, Y; Ivanilov, A; Jackson, H E; Jo, H S; Joosten, S; Kaiser, R; Karyan, G; Keri, T; Kinney, E; Kisselev, A; Kobayashi, N; Korotkov, V; Kozlov, V; Kravchenko, P; Krivokhijine, V G; Lagamba, L; Lapiks, L; Lehmann, I; Lenisa, P; Ruiz, A Lpez; Lorenzon, W; Lu, X -G; Ma, B -Q; Mahon, D; Makins, N C R; Manaenkov, S I; Mao, Y; Marianski, B; de la Ossa, A Martinez; Marukyan, H; Miller, C A; Miyachi, Y; Movsisyan, A; Muccifora, V; Murray, M; Mussgiller, A; Nappi, E; Naryshkin, Y; Nass, A; Negodaev, M; Nowak, W -D; Pappalardo, L L; Perez-Benito, R; Reimer, P E; Reolon, A R; Riedl, C; Rith, K; Rosner, G; Rostomyan, A; Rubin, J; Ryckbosch, D; Salomatin, Y; Sanftl, F; Schfer, A; Schnell, G; Schler, K P; Seitz, B; Shibata, T -A; Shutov, V; Stancari, M; Statera, M; Steffens, E; Steijger, J J M; Stewart, J; Stinzing, F; Taroian, S; Terkulov, A; Truty, R; Trzcinski, A; Tytgat, M; Vandenbroucke, A; Van Haarlem, Y; Van Hulse, C; Veretennikov, D; Vikhrov, V; Vilardi, I; Wang, S; Yaschenko, S; Ye, Z; Yu, W; Zagrebelnyy, V; Zeiler, D; Zihlmann, B; Zupranski, P

2014-01-01T23:59:59.000Z

342

Transverse polarization of $?$ hyperons from quasireal photoproduction on nuclei  

E-Print Network [OSTI]

The transverse polarization of $\\Lambda$ hyperons was measured in inclusive quasireal photoproduction for various target nuclei ranging from hydrogen to xenon. The data were obtained by the HERMES experiment at HERA using the 27.6 GeV lepton beam and nuclear gas targets internal to the lepton storage ring. The polarization observed is positive for light target nuclei and is compatible with zero for krypton and xenon.

The HERMES Collaboration; A. Airapetian; N. Akopov; Z. Akopov; E. C. Aschenauer; W. Augustyniak; R. Avakian; A. Avetissian; E. Avetisyan; S. Belostotski; N. Bianchi; H. P. Blok; A. Borissov; J. Bowles; I. Brodski; V. Bryzgalov; J. Burns; M. Capiluppi; G. P. Capitani; E. Cisbani; G. Ciullo; M. Contalbrigo; P. F. Dalpiaz; W. Deconinck; R. De Leo; L. De Nardo; E. De Sanctis; M. Diefenthaler; P. Di Nezza; M. Dren; M. Ehrenfried; G. Elbakian; F. Ellinghaus; R. Fabbri; A. Fantoni; L. Felawka; S. Frullani; D. Gabbert; G. Gapienko; V. Gapienko; F. Garibaldi; G. Gavrilov; V. Gharibyan; F. Giordano; S. Gliske; M. Golembiovskaya; C. Hadjidakis; M. Hartig; D. Hasch; A. Hillenbrand; M. Hoek; Y. Holler; I. Hristova; Y. Imazu; A. Ivanilov; H. E. Jackson; H. S. Jo; S. Joosten; R. Kaiser; G. Karyan; T. Keri; E. Kinney; A. Kisselev; N. Kobayashi; V. Korotkov; V. Kozlov; P. Kravchenko; V. G. Krivokhijine; L. Lagamba; L. Lapiks; I. Lehmann; P. Lenisa; A. Lpez Ruiz; W. Lorenzon; X. -G. Lu; B. -Q. Ma; D. Mahon; N. C. R. Makins; S. I. Manaenkov; Y. Mao; B. Marianski; A. Martinez de la Ossa; H. Marukyan; C. A. Miller; Y. Miyachi; A. Movsisyan; V. Muccifora; M. Murray; A. Mussgiller; E. Nappi; Y. Naryshkin; A. Nass; M. Negodaev; W. -D. Nowak; L. L. Pappalardo; R. Perez-Benito; P. E. Reimer; A. R. Reolon; C. Riedl; K. Rith; G. Rosner; A. Rostomyan; J. Rubin; D. Ryckbosch; Y. Salomatin; F. Sanftl; A. Schfer; G. Schnell; K. P. Schler; B. Seitz; T. -A. Shibata; V. Shutov; M. Stancari; M. Statera; E. Steffens; J. J. M. Steijger; J. Stewart; F. Stinzing; S. Taroian; A. Terkulov; R. Truty; A. Trzcinski; M. Tytgat; A. Vandenbroucke; Y. Van Haarlem; C. Van Hulse; D. Veretennikov; V. Vikhrov; I. Vilardi; S. Wang; S. Yaschenko; Z. Ye; W. Yu; V. Zagrebelnyy; D. Zeiler; B. Zihlmann; P. Zupranski

2014-06-12T23:59:59.000Z

343

indirect LFV Stephan Lammel, Fermilab CD  

E-Print Network [OSTI]

, Fermilab CD Lepton-Photon 2005 Uppsala, June 30th Search for Higgs and New Phenomena at Colliders / #12;Lepton-Photon 2005 Stephan Lammel, Fermilab CD 2005-Jun-30, page 2/28 · Large variety of excellent-Photon 2005 Stephan Lammel, Fermilab CD 2005-Jun-30, page 3/28 Precision EWK/Top and Higgs CDF/D0 mtop went

Fermilab

344

Neutrinoless Quadruple Beta Decay  

E-Print Network [OSTI]

We point out that lepton number violation is possible even if neutrinos are Dirac particles. We illustrate this by constructing a simple model that allows for lepton number violation by four units only. As a consequence, neutrinoless double beta decay is forbidden, but neutrinoless quadruple beta decay is possible: $(A,Z) \\to (A,Z+4) + 4 e^-$. We identify three candidate isotopes for this decay, the most promising one being Nd-150 due to its high $Q_{0\

Julian Heeck; Werner Rodejohann

2013-06-03T23:59:59.000Z

345

Big Questions: The Ultimate Building Blocks of Matter  

SciTech Connect (OSTI)

The Standard Model of particle physics treats quarks and leptons as having no size at all. Quarks are found inside protons and neutrons and the most familiar lepton is the electron. While the best measurements to date support that idea, there is circumstantial evidence that suggests that perhaps the these tiny particles might be composed of even smaller building blocks. This video explains this circumstantial evidence and introduces some very basic ideas of what those building blocks might be.

Lincoln, Don

2013-11-06T23:59:59.000Z

346

Seesaw Models with Minimal Flavor Violation  

E-Print Network [OSTI]

We explore realizations of minimal flavor violation (MFV) for leptons in the simplest seesaw models where the neutrino mass generation mechanism is driven by new fermion singlets (type I) or triplets (type III) and by a scalar triplet (type II). We also discuss similarities and differences of the MFV implementation among the three scenarios. To study the phenomenological implications, we consider a number of effective dimension-six operators that are purely leptonic or couple leptons to the standard-model gauge and Higgs bosons and evaluate constraints on the scale of MFV associated with these operators from the latest experimental information. Specifically, we employ the most recent measurements of neutrino mixing parameters as well as the currently available data on flavor-violating radiative and three-body decays of charged leptons, mu -> e conversion in nuclei, the anomalous magnetic moments of charged leptons, and their electric dipole moments. The most stringent lower-limit on the MFV scale comes from the present experimental bound on mu -> e gamma and can reach 500 TeV or higher, depending on the details of the seesaw scheme. With our numerical results, we illustrate some important differences among the seesaw types. Particularly, we show that in types I and III there are features which can bring about potentially remarkable effects which do not occur in type II. In addition, we comment on how one of the new effective operators can induce flavor-changing dilepton decays of the Higgs boson.

Xiao-Gang He; Chao-Jung Lee; Jusak Tandean; Ya-Juan Zheng

2015-01-27T23:59:59.000Z

347

Inquiring Minds  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

is the world made of? is the world made of? The building blocks Physicists have identified 12 building blocks that are the fundamental constituents of matter. Our everyday world is made of just three of these building blocks: the up quark, the down quark and the electron. This set of particles is all that's needed to make protons and neutrons and to form atoms and molecules. The electron neutrino, observed in the decay of other particles, completes the first set of four building blocks. The building blocks of matter: six quarks and six leptons. For some reason nature has elected to replicate this first generation of quarks and leptons to produce a total of six quarks and six leptons, with increasing mass. Like all quarks, the sixth quark, named top, is much smaller than a proton (in fact, no one knows how small quarks are), but the

348

Searches for supersymmetry based on events with b jets and four W bosons in pp collisions at 8 TeV  

E-Print Network [OSTI]

Five mutually exclusive searches for supersymmetry are presented based on events in which b jets and four W bosons are produced in proton-proton collisions at $\\sqrt{s}$ = 8 TeV. The data, corresponding to an integrated luminosity of 19.5 fb$^{-1}$, were collected with the CMS experiment at the CERN LHC in 2012. The five studies differ in the leptonic signature from the W boson decays, and correspond to all-hadronic, single-lepton, opposite-sign dilepton, same-sign dilepton, and $\\geq$3 lepton final states. The results of the five studies are combined to yield 95% confidence level exclusions of 1280 and 570 GeV for the gluino and bottom-squark masses in the context of gluino and bottom-squark pair production, respectively. These limits are around 50 GeV more stringent than are obtained from any of the individual channels.

Khachatryan, Vardan; Tumasyan, Armen; Adam, Wolfgang; Bergauer, Thomas; Dragicevic, Marko; Er, Janos; Friedl, Markus; Fruehwirth, Rudolf; Ghete, Vasile Mihai; Hartl, Christian; Hrmann, Natascha; Hrubec, Josef; Jeitler, Manfred; Kiesenhofer, Wolfgang; Knnz, Valentin; Krammer, Manfred; Krtschmer, Ilse; Liko, Dietrich; Mikulec, Ivan; Rabady, Dinyar; Rahbaran, Babak; Rohringer, Herbert; Schfbeck, Robert; Strauss, Josef; Treberer-Treberspurg, Wolfgang; Waltenberger, Wolfgang; Wulz, Claudia-Elisabeth; Mossolov, Vladimir; Shumeiko, Nikolai; Suarez Gonzalez, Juan; Alderweireldt, Sara; Bansal, Sunil; Cornelis, Tom; De Wolf, Eddi A; Janssen, Xavier; Knutsson, Albert; Lauwers, Jasper; Luyckx, Sten; Ochesanu, Silvia; Rougny, Romain; Van De Klundert, Merijn; Van Haevermaet, Hans; Van Mechelen, Pierre; Van Remortel, Nick; Van Spilbeeck, Alex; Blekman, Freya; Blyweert, Stijn; D'Hondt, Jorgen; Daci, Nadir; Heracleous, Natalie; Keaveney, James; Lowette, Steven; Maes, Michael; Olbrechts, Annik; Python, Quentin; Strom, Derek; Tavernier, Stefaan; Van Doninck, Walter; Van Mulders, Petra; Van Onsem, Gerrit Patrick; Villella, Ilaria; Caillol, Ccile; Clerbaux, Barbara; De Lentdecker, Gilles; Dobur, Didar; Favart, Laurent; Gay, Arnaud; Grebenyuk, Anastasia; Lonard, Alexandre; Mohammadi, Abdollah; Perni, Luca; Randle-conde, Aidan; Reis, Thomas; Seva, Tomislav; Thomas, Laurent; Vander Velde, Catherine; Vanlaer, Pascal; Wang, Jian; Zenoni, Florian; Adler, Volker; Beernaert, Kelly; Benucci, Leonardo; Cimmino, Anna; Costantini, Silvia; Crucy, Shannon; Dildick, Sven; Fagot, Alexis; Garcia, Guillaume; Mccartin, Joseph; Ocampo Rios, Alberto Andres; Poyraz, Deniz; Ryckbosch, Dirk; Salva Diblen, Sinem; Sigamani, Michael; Strobbe, Nadja; Thyssen, Filip; Tytgat, Michael; Yazgan, Efe; Zaganidis, Nicolas; Basegmez, Suzan; Beluffi, Camille; Bruno, Giacomo; Castello, Roberto; Caudron, Adrien; Ceard, Ludivine; Da Silveira, Gustavo Gil; Delaere, Christophe; Du Pree, Tristan; Favart, Denis; Forthomme, Laurent; Giammanco, Andrea; Hollar, Jonathan; Jafari, Abideh; Jez, Pavel; Komm, Matthias; Lemaitre, Vincent; Nuttens, Claude; Perrini, Lucia; Pin, Arnaud; Piotrzkowski, Krzysztof; Popov, Andrey; Quertenmont, Loic; Selvaggi, Michele; Vidal Marono, Miguel; Vizan Garcia, Jesus Manuel; Beliy, Nikita; Caebergs, Thierry; Daubie, Evelyne; Hammad, Gregory Habib; Ald Jnior, Walter Luiz; Alves, Gilvan; Brito, Lucas; Correa Martins Junior, Marcos; Dos Reis Martins, Thiago; Molina, Jorge; Mora Herrera, Clemencia; Pol, Maria Elena; Rebello Teles, Patricia; Carvalho, Wagner; Chinellato, Jose; Custdio, Analu; Da Costa, Eliza Melo; De Jesus Damiao, Dilson; De Oliveira Martins, Carley; Fonseca De Souza, Sandro; Malbouisson, Helena; Matos Figueiredo, Diego; Mundim, Luiz; Nogima, Helio; Prado Da Silva, Wanda Lucia; Santaolalla, Javier; Santoro, Alberto; Sznajder, Andre; Tonelli Manganote, Edmilson Jos; Vilela Pereira, Antonio; Bernardes, Cesar Augusto; Dogra, Sunil; Tomei, Thiago; De Moraes Gregores, Eduardo; Mercadante, Pedro G; Novaes, Sergio F; Padula, Sandra; Aleksandrov, Aleksandar; Genchev, Vladimir; Hadjiiska, Roumyana; Iaydjiev, Plamen; Marinov, Andrey; Piperov, Stefan; Rodozov, Mircho; Stoykova, Stefka; Sultanov, Georgi; Vutova, Mariana; Dimitrov, Anton; Glushkov, Ivan; Litov, Leander; Pavlov, Borislav; Petkov, Peicho; Bian, Jian-Guo; Chen, Guo-Ming; Chen, He-Sheng; Chen, Mingshui; Cheng, Tongguang; Du, Ran; Jiang, Chun-Hua; Plestina, Roko; Romeo, Francesco; Tao, Junquan; Wang, Zheng; Asawatangtrakuldee, Chayanit; Ban, Yong; Liu, Shuai; Mao, Yajun; Qian, Si-Jin; Wang, Dayong; Xu, Zijun; Zhang, Linlin; Zou, Wei; Avila, Carlos; Cabrera, Andrs; Chaparro Sierra, Luisa Fernanda; Florez, Carlos; Gomez, Juan Pablo; Gomez Moreno, Bernardo; Sanabria, Juan Carlos; Godinovic, Nikola; Lelas, Damir; Polic, Dunja; Puljak, Ivica; Antunovic, Zeljko; Kovac, Marko; Brigljevic, Vuko; Kadija, Kreso; Luetic, Jelena; Mekterovic, Darko; Sudic, Lucija; Attikis, Alexandros; Mavromanolakis, Georgios; Mousa, Jehad; Nicolaou, Charalambos; Ptochos, Fotios; Razis, Panos A; Rykaczewski, Hans; Bodlak, Martin; Finger, Miroslav; Finger Jr, Michael; Assran, Yasser; Ellithi Kamel, Ali; Mahmoud, Mohammed; Radi, Amr; Kadastik, Mario; Murumaa, Marion; Raidal, Martti; Tiko, Andres; Eerola, Paula; Voutilainen, Mikko; Hrknen, Jaakko; Karimki, Veikko; Kinnunen, Ritva; Kortelainen, Matti J; Lampn, Tapio; Lassila-Perini, Kati; Lehti, Sami; Lindn, Tomas; Luukka, Panja-Riina; Menp, Teppo; Peltola, Timo; Tuominen, Eija; Tuominiemi, Jorma; Tuovinen, Esa; Wendland, Lauri

2014-01-01T23:59:59.000Z

349

Latest results from the MARK II at PEP  

SciTech Connect (OSTI)

We present single photon annihilation results from the MARK II detector at PEP based on approx. 100 pb/sup -1/ of integrated luminosity taken at a center of mass energy ..sqrt..s = 29 GeV. A study of inclusive leptons for momenta greater than or equal to 2 GeV/c yield the average semileptonic branching ratios of bottom (b) and charm (c) quarks and information about the b fragmentation function. A measurement of the bottom hadron lifetime is presented based on a study of the prompt lepton impact parameters. In addition we report on a precise measurement of the tau lifetime and an updated D/sup 0/ lifetime. We also present a search for supersymmetric electrons, weak neutral current couplings from leptons and bottom particles and evidence for K*'s at PEP. 43 references.

Lockyer, N.

1983-10-01T23:59:59.000Z

350

Falsifying High-Scale Leptogenesis at the LHC  

E-Print Network [OSTI]

Measuring a non-zero value for the cross section of any lepton number violating (LNV) process would put a strong lower limit on the washout factor for the effective lepton number density in the early universe at times close to the electroweak phase transition and thus would lead to important constraints on any high-scale model for the generation of the observed baryon asymmetry based on LNV. In particular, for leptogenesis models with masses of the right-handed neutrinos heavier than the mass scale observed at the LHC, the implied large washout factors would lead to a violation of the out-of-equilibrium condition and exponentially suppress the net lepton number produced in such leptogenesis models. We thus demonstrate that the observation of LNV processes at the LHC results in the falsification of high-scale leptogenesis models. However, no conclusions about the viability of leptogenesis models can be drawn from the non-observation of LNV processes.

Frank F. Deppisch; Julia Harz; Martin Hirsch

2014-06-23T23:59:59.000Z

351

Measurement of sigma(ppbar->Z) Br(Z->tau+tau-) and search for Higgs bosons decaying to tau+tau- at s**(1/2) = 1.96 TeV  

SciTech Connect (OSTI)

The resonant production of tau-lepton pairs is as interesting for the study of Standard Model (SM) physics as the production of lighter leptons pairs. For new phenomena, such as Higgs boson production or in case new particles beyond the SM would arise, the detection of (resonant) pairs of tau leptons becomes much more interesting. This is due to the fact that tau leptons are much heavier than the other leptons, which increases the chance that these new phenomena would be observed first in this channel. Unfortunately their clean detection is far more difficult than that of muons or electrons. The cross section times branching ratio {sigma}{center_dot} Br for the process p{bar p} {yields} Z {yields} {tau}{sup +}{tau}{sup -} was measured at {radical}s = 1.96 GeV using 1.0 fb{sup -1} of data collected by the D0 experiment. This measurement was performed in the channel in which one of the tau leptons decays to a muon and neutrinos, while the other decays either hadronically or to an electron and neutrinos. A set of 1511 events, of which about 20% estimated background, passed all selection criteria. The trigger and muon reconstruction efficiencies, as well as the efficiency for track reconstruction were obtained from data using the 'tag and probe' method on Z {yields} {mu}{sup +}{mu}{sup -} events. The multijet background was estimated from the sample of events which passed all selection criteria but in which the muon and the tau candidate had the same charge. The W {yields} {mu}{nu} + jets background was modeled by Monte Carlo simulations, but normalized to data. All the other backgrounds, as well as the efficiency for Z {yields} {tau}{sup +}{tau}{sup -} events were estimated using simulated events normalized to the theoretical calculations of cross sections at next-to-leading order or next-to-next-to-leading order. The energy of the tau candidates was corrected for the estimated response of the charged pions in the calorimeter, which is of the order 50-80%. Since the charged pion response in data was not well reproduced by the default simulation of hadronic interactions (Geisha), a different simulation (gCALOR) was used to obtain an estimated charged pion response consistent with the one measured in data. This tau energy correction method makes use of the superior resolution of the track momentum measurement compared to the resolution of the tau candidate energy as measured by the calorimeter, which leads to a better data--simulation agreement and a decrease of 10% in the resolution of the visible mass peak. The result of this measurement is {sigma}(p{bar p} {yields} Z) {center_dot} Br(Z {yields} {tau}{sup +}{tau}{sup -}) = 240 {+-} 8(stat) {+-} 12(syst) {+-} 15(lumi) pb, in good agreement with the theoretical predictions of 241.6{sub -3.2}{sup +3.6} pb [79] or 251.9{sub -12}{sup +5.1} pb [93-95], as well as with other measurements performed by the D0 and CDF experiments in all channels in which the Z boson decays leptonically [96-100]. This is the most precise Z boson cross section measurement to date performed in the tau lepton channel at hadron colliders. The analysis demonstrates the ability of the D0 experiment to identify tau leptons decaying hadronically with good efficiency and high purity, a challenging task in p{bar p} collisions where the number of jets resembling tau leptons is very high. This achievement forms a solid basis for other analyses using hadronic tau lepton decays, such as the search for the Higgs boson decaying into tau-lepton pairs, which was performed for the last part of this thesis.

Galea, Cristina Florina; /Nijmegen U.

2008-01-01T23:59:59.000Z

352

The Super Flavor Factory  

E-Print Network [OSTI]

The main physics goals of a high luminosity e+e- flavor factory are discussed, including the possibilities to perform detailed studies of the CKM mechanism of quark mixing, and constrain virtual Higgs and non-standard model particle contributions to the dynamics of rare B_u,d,s decays. The large samples of $D$ mesons and tau leptons produced at a flavor factory will result in improved sensitivities on D mixing and lepton flavor violation searches, respectively. One can also test fundamental concepts such as lepton universality to much greater precision than existing constraints and improve the precision on tests of CPT from B meson decays. Recent developments in accelerator physics have demonstrated the feasibility to build an accelerator that can achieve luminosities of O(10^36) cm^-2 s^-1.

A. J. Bevan

2007-01-23T23:59:59.000Z

353

QCD background for the UA1 W?tb signal  

Science Journals Connector (OSTI)

The ccX and bbX background affecting the W?tb e/?+2 jets signal reported by the UA1 Collaboration is discussed. Calculations are based on an O(?s 2)+leading-pole approximation scheme, which includes jet radiation in the initial and final states of the hard binary parton process, and include the heavy-flavor excitation contribution, the stability of which has been checked. The main conclusions are the following. (i) Selection cuts naturally induce a topological event structure on the surviving background mimicking that expected for a W?tb signal. (ii) The background rates for ?+2 jets events, on which we concentrate, are compatible within theoretical uncertainties with the number of events experimentally observed. The importance of purely leptonic decay modes, which survive the lepton-isolation cuts, and the bias induced by lepton-isolation cuts on background event topologies are also clarified.

A. Grosso and R. Odorico

1985-12-01T23:59:59.000Z

354

Signals of an invisibly decaying Higgs in a scalar dark matter scenario: a study for the Large Hadron Collider  

E-Print Network [OSTI]

We consider the collider phenomenology of a singlet Majoron model with softly broken lepton number. Lepton number is spontaneously broken when the real part of a new singlet scalar develops vacuum expectation value. With the additional soft terms violating lepton numbers, the imaginary part of this singlet scalar becomes a massive pseudo-Majoron which can account for the dark matter. In presence of the coupling of the pseudo-Majoron with the Standard Model (SM) Higgs, the SM Higgs mostly decays into a pair of pseudo-Majorons, giving rise to missing transverse energy signals at a hadron collider. Since the Higgs visible decay branching fractions get reduced in presence of this invisible decay mode, the bounds on the SM Higgs mass from the LEP and Tevatron experiments get diluted and the invisible decay channel of the Higgs become important for the discovery of low mass Higgs at the Large Hadron Collider.

Kirtiman Ghosh; Biswarup Mukhopadhyaya; Utpal Sarkar

2011-05-29T23:59:59.000Z

355

The Universe Adventure - Fundamental Particles  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Fundamental Particles Fundamental Particles Chart of Fundamental Particles All matter in the universe is comprised of fundamental particles. So what exactly makes up this matter? All matter is made of fundamental particles that came into being at the birth of the Universe. Quarks experience the strong force which is carried by massless particles called gluons. They bond together in specific combinations to form protons, neutrons, and other hadrons. Leptons do not experience the strong force but may interact via the electromagnetic force, the weak force, or both. Anti-quarks and anti-leptons are exactly the same as their quark and lepton counterparts, but have an opposite charge. All massive particles are influenced by the force of gravity. Quark-Gluon Plasma: 10-12 Seconds After the Big Bang

356

Measurements of W/Z production with the ATLAS detector  

SciTech Connect (OSTI)

W and Z boson production have been measured in the electron, muon and tau decay channels at the LHC with the ATLAS detector. Total and differential cross sections, defined in terms of the decay lepton kinematics, have been measured as a function of rapidity and transverse momentum. Ratios of the cross sections demonstrate sensitivity to lepton universality. The kinematic distributions constrain parton densities and QCD calculations, including resummations of soft gluon radiation and the matching of NLO matrix elements (or high multiplicity tree-level matrix elements) to parton shower approximations. The polarization of W bosons is also measured, as, for the first time, is the polarization of the tau lepton in W ? ?? decays.

Kneke, Karsten [CERN, CH-1211 Genve 23 (Switzerland); Collaboration: ATLAS Collaboration

2013-10-21T23:59:59.000Z

357

Search for Scalar Top Quark Pair-Production in Scenario with Violated R-parity in ppbar Collisions at sqrt(s)=1.96 TeV  

SciTech Connect (OSTI)

A search for the pair production of supersymmetric partner of the top quark in scenario with R-parity violation is presented. The quantum number called R-parity distinguishes particles in standard model from supersymmetric particles. A scalar top quark (stop) is assumed to decay only via R{sub p}-violating supersymmetric coupling into tau lepton and b-quark. To collect events with multiple taus, a new special tau trigger (the lepton plus track trigger) is installed in Run II experiment of the Collider Detector at Fermilab (CDF). The goal of the lepton plus track trigger is to collect generic dilepton ({ell}{ell}, {ell}{tau}, {tau}{tau}) events with lower p{sub T} threshold (8 GeV/c) and without prescale even at high luminosity. The Z {yields} {tau}{tau} event, where one {tau}-lepton decays leptonically and the other hadronically, is a good benchmark to calibrate the lepton plus track trigger and {tau} identification. The data sample of 72 pb{sup -1}, collected using the electron plus track trigger, contains clear a {tau} signal from Z {yields} {tau}{tau} events. The data used in stop search correspond to 200 pb{sup -1}. The lower stop mass bound of 134 GeV/c{sup 2} at a 95% confidence level is obtained. This limit is also directly applicable to the case of the third generation scalar leptoquark (LQ{sub 3}) assuming a 100% branching for the LQ{sub 3} {yields} {tau}b decay mode.

Ogawa, Takashi; /Waseda U.

2005-01-01T23:59:59.000Z

358

Exploring the Doubly Charged Higgs of the Left-Right Symmetric Model using Vector Boson Fusion-like Events at the LHC  

E-Print Network [OSTI]

This paper studies the pair production of the doubly charged Higgs boson of the left-right symmetric models using multilepton final state in the vector boson fusion (VBF)-like processes. The study is performed in the framework consistent with the model's correction to the standard model $\\rho_{EW}$ parameter. VBF topological cuts, number of leptons in the final state and $p_T$ cuts on the leptons are found to be effective in suppressing the background. Significant mass reach can be achieved for exclusion/discovery of the doubly charge Higgs boson for the upcoming LHC run with a luminosity of $\\mathcal{O}(10^3)$ fb$^{-1}$.

Bhaskar Dutta; Ricardo Eusebi; Yu Gao; Tathagata Ghosh; Teruki Kamon

2014-04-02T23:59:59.000Z

359

Proton radius puzzle in Hamiltonian dynamics  

E-Print Network [OSTI]

Relativistic lepton-proton bound-state eigenvalue equations for Hamiltonians derived from quantum field theory using second-order renormalization group procedure for effective particles, are reducible to two-body Schroedinger eigenvalue equations with the effective Coulomb potential that exhibits a tiny sensitivity to the characteristic momentum-scale of the bound system. The scale dependence is shown to be relevant to the theoretical interpretation of precisely measured lepton-proton bound-state energy levels in terms of a 4 percent difference between the proton radii in muon-proton and electron-proton bound states.

Stanislaw D. Glazek

2014-10-21T23:59:59.000Z

360

Beauty and charm results from $B$-factories  

E-Print Network [OSTI]

We present the proceedings of the lectures given at the 2008 Helmholtz International Summer School Heavy Quark Physics at the Bogoliubov Laboratory of Theoretical Physics in Dubna. In two lectures we present recent results from the existing $B$-factories experiments, Belle and BaBar. The discussed topics include short phenomenological motivation, experimental methods and results on $B$ meson oscillations, selected rare $B$ meson decays (leptonic, $b\\to s\\gamma$ and $b\\to s\\ell^+\\ell^-$), mixing and CP violation in the system of $D^0$ mesons, and leptonic decays of $D_s$ mesons.

B. Golob

2009-01-11T23:59:59.000Z

Note: This page contains sample records for the topic "leptons leptons leptons" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


361

Bulk viscosity in kaon condensed matter  

E-Print Network [OSTI]

We investigate the effect of $K^-$ condensed matter on bulk viscosity and r-mode instability in neutron stars. The bulk viscosity coefficient due to the non-leptonic process $n \\rightleftharpoons p + K^-$ is studied here. In this connection, equations of state are constructed within the framework of relativistic field theoretical models where nucleon-nucleon and kaon-nucleon interactions are mediated by the exchange of scalar and vector mesons. We find that the bulk viscosity coefficient due to the non-leptonic weak process in the condensate is suppressed by several orders of magnitude. Consequently, kaon bulk viscosity may not damp the r-mode instability in neutron stars.

Debarati Chatterjee; Debades Bandyopadhyay

2007-02-09T23:59:59.000Z

362

Measurement of the ZZ production cross section using the full CDF II data set  

Science Journals Connector (OSTI)

We present a measurement of the ZZ-boson pair-production cross section in 1.96TeV center-of-mass energy pp collisions. We reconstruct final states incorporating four charged leptons or two charged leptons and two neutrinos from the full data set collected by the Collider Detector experiment at the Fermilab Tevatron, corresponding to 9.7??fb?1 of integrated luminosity. Combining the results obtained from each final state, we measure a cross section of 1.04?0.25+0.32??pb, in good agreement with the standard model prediction at next-to-leading order in the strong-interaction coupling.

T. Aaltonen et al. (CDF Collaboration)

2014-06-03T23:59:59.000Z

363

Model Building  

E-Print Network [OSTI]

In this talk I begin with some general discussion of model building in particle theory, emphasizing the need for motivation and testability. Three illustrative examples are then described. The first is the Left-Right model which provides an explanation for the chirality of quarks and leptons. The second is the 331-model which offers a first step to understanding the three generations of quarks and leptons. Third and last is the SU(15) model which can accommodate the light leptoquarks possibly seen at HERA.

Paul H. Frampton

1997-06-03T23:59:59.000Z

364

Spontaneous R-parity violation bounds  

Science Journals Connector (OSTI)

We investigate bounds from tree-level and one-loop processes in generic supersymmetric models with spontaneous R-parity breaking in the superpotential. We analyze the bounds from a general point of view. The bounds are applicable both for all models with spontaneous R-parity violation and for explicit bilinear R-parity violation based on general lepton-chargino and neutrino-neutralino mixings. We find constraints from semileptonic B, D, and K decays, leptonic decays of the ? and ?, electric dipole moments, as well as bounds for the anomalous magnetic moment of the muon.

M. Frank and K. Huitu

2001-10-09T23:59:59.000Z

365

Electric dipole moments from flavored CP violation in supersymmetry  

SciTech Connect (OSTI)

The so-called supersymmetric flavor and CP problems are deeply related to the origin of flavor and hence to the origin of the standard model Yukawa couplings themselves. We show that realistic SU(3) flavor symmetries with spontaneous CP violation reproducing correctly the standard model Yukawa matrices can simultaneously solve both problems without ad hoc modifications of the supersymmetric model. We analyze the leptonic electric dipole moments and lepton flavor violation processes in these models. We show that the electron electric dipole moment and the decay {mu}{yields}e{gamma} are naturally within reach of the proposed experiments if the sfermion masses are measurable at the LHC.

Calibbi, L. [SISSA/ISAS and INFN, I-34013, Trieste (Italy); Departament de Fisica Teorica and IFIC, Universitat de Valencia-CSIC, E-46100, Burjassot (Spain); Perez, J. Jones; Vives, O. [Departament de Fisica Teorica and IFIC, Universitat de Valencia-CSIC, E-46100, Burjassot (Spain)

2008-10-01T23:59:59.000Z

366

Neutrino interactions in oscillation experiments  

Science Journals Connector (OSTI)

We calculate the neutrino induced cross sections relevant for oscillation experiments, including the ?-lepton threshold for quasielastic, resonance and deep-inelastic scattering. In addition to threshold effects, we include nuclear corrections for heavy targets which are moderate for quasielastic and large for single pion production. The nuclear effects for deep-inelastic reactions are small. We present cross sections together with their nuclear corrections for various channels which are useful for interpreting the experimental results and for determining parameters of the neutrino sector. Finally, we calculate the ?-lepton event rates for the OPERA LBL experiment.

E. A. Paschos and J. Y. Yu

2002-01-07T23:59:59.000Z

367

Measurement of the ZZ production cross section using the full CDF II data set  

E-Print Network [OSTI]

We present a measurement of the ZZ boson-pair production cross section in 1.96 TeV center-of-mass energy ppbar collisions. We reconstruct final states incorporating four charged leptons or two charged leptons and two neutrinos from the full data set collected by the Collider Detector experiment at the Fermilab Tevatron, corresponding to 9.7 fb-1 of integrated luminosity. Combining the results obtained from each final state, we measure a cross section of 1.04(+0.32)(-0.25) pb, in good agreement with the standard model prediction at next-to-leading order in the strong-interaction coupling.

CDF Collaboration; T. Aaltonen; S. Amerio; D. Amidei; A. Anastassov; A. Annovi; J. Antos; G. Apollinari; J. A. Appel; T. Arisawa; A. Artikov; J. Asaadi; W. Ashmanskas; B. Auerbach; A. Aurisano; F. Azfar; W. Badgett; T. Bae; A. Barbaro-Galtieri; V. E. Barnes; B. A. Barnett; P. Barria; P. Bartos; M. Bauce; F. Bedeschi; S. Behari; G. Bellettini; J. Bellinger; D. Benjamin; A. Beretvas; A. Bhatti; K. R. Bland; B. Blumenfeld; A. Bocci; A. Bodek; D. Bortoletto; J. Boudreau; A. Boveia; L. Brigliadori; C. Bromberg; E. Brucken; J. Budagov; H. S. Budd; K. Burkett; G. Busetto; P. Bussey; P. Butti; A. Buzatu; A. Calamba; S. Camarda; M. Campanelli; F. Canelli; B. Carls; D. Carlsmith; R. Carosi; S. Carrillo; B. Casal; M. Casarsa; A. Castro; P. Catastini; D. Cauz; V. Cavaliere; M. Cavalli-Sforza; A. Cerri; L. Cerrito; Y. C. Chen; M. Chertok; G. Chiarelli; G. Chlachidze; K. Cho; D. Chokheli; A. Clark; C. Clarke; M. E. Convery; J. Conway; M. Corbo; M. Cordelli; C. A. Cox; D. J. Cox; M. Cremonesi; D. Cruz; J. Cuevas; R. Culbertson; N. d'Ascenzo; M. Datta; P. de Barbaro; L. Demortier; L. Marchese; M. Deninno; F. Devoto; M. D'Errico; A. Di Canto; B. Di Ruzza; J. R. Dittmann; M. D'Onofrio; S. Donati; M. Dorigo; A. Driutti; K. Ebina; R. Edgar; A. Elagin; R. Erbacher; S. Errede; B. Esham; S. Farrington; J. P. Fernndez Ramos; R. Field; G. Flanagan; R. Forrest; M. Franklin; J. C. Freeman; H. Frisch; Y. Funakoshi; C. Galloni; A. F. Garfinkel; P. Garosi; H. Gerberich; E. Gerchtein; S. Giagu; V. Giakoumopoulou; K. Gibson; C. M. Ginsburg; N. Giokaris; P. Giromini; G. Giurgiu; V. Glagolev; D. Glenzinski; M. Gold; D. Goldin; A. Golossanov; G. Gomez; G. Gomez-Ceballos; M. Goncharov; O. Gonzlez Lpez; I. Gorelov; A. T. Goshaw; K. Goulianos; E. Gramellini; S. Grinstein; C. Grosso-Pilcher; R. C. Group; J. Guimaraes da Costa; S. R. Hahn; J. Y. Han; F. Happacher; K. Hara; M. Hare; R. F. Harr; T. Harrington-Taber; K. Hatakeyama; C. Hays; J. Heinrich; M. Herndon; A. Hocker; Z. Hong; W. Hopkins; S. Hou; R. E. Hughes; U. Husemann; M. Hussein; J. Huston; G. Introzzi; M. Iori; A. Ivanov; E. James; D. Jang; B. Jayatilaka; E. J. Jeon; S. Jindariani; M. Jones; K. K. Joo; S. Y. Jun; T. R. Junk; M. Kambeitz; T. Kamon; P. E. Karchin; A. Kasmi; Y. Kato; W. Ketchum; J. Keung; B. Kilminster; D. H. Kim; H. S. Kim; J. E. Kim; M. J. Kim; S. B. Kim; S. H. Kim; Y. K. Kim; Y. J. Kim; N. Kimura; M. Kirby; K. Knoepfel; K. Kondo; D. J. Kong; J. Konigsberg; A. V. Kotwal; M. Kreps; J. Kroll; M. Kruse; T. Kuhr; M. Kurata; A. T. Laasanen; S. Lammel; M. Lancaster; K. Lannon; G. Latino; H. S. Lee; J. S. Lee; S. Leo; S. Leone; J. D. Lewis; A. Limosani; E. Lipeles; A. Lister; H. Liu; Q. Liu; T. Liu; S. Lockwitz; A. Loginov; A. Luc; D. Lucchesi; J. Lueck; P. Lujan; P. Lukens; G. Lungu; J. Lys; R. Lysak; R. Madrak; P. Maestro; S. Malik; G. Manca; A. Manousakis-Katsikakis; F. Margaroli; P. Marino; M. Martnez; K. Matera; M. E. Mattson; A. Mazzacane; P. Mazzanti; R. McNulty; A. Mehta; P. Mehtala; C. Mesropian; T. Miao; D. Mietlicki; A. Mitra; H. Miyake; S. Moed; N. Moggi; C. S. Moon; R. Moore; M. J. Morello; A. Mukherjee; Th. Muller; P. Murat; M. Mussini; J. Nachtman; Y. Nagai; J. Naganoma; I. Nakano; A. Napier; J. Nett; C. Neu; T. Nigmanov; L. Nodulman; S. Y. Noh; O. Norniella; L. Oakes; S. H. Oh; Y. D. Oh; I. Oksuzian; T. Okusawa; R. Orava; L. Ortolan; C. Pagliarone; E. Palencia; P. Palni; V. Papadimitriou; W. Parker; G. Pauletta; M. Paulini; C. Paus; T. J. Phillips; G. Piacentino; E. Pianori; J. Pilot; K. Pitts; C. Plager; L. Pondrom; S. Poprocki; K. Potamianos; F. Prokoshin; A. Pranko; F. Ptohos; G. Punzi; N. Ranjan; I. Redondo Fernndez; P. Renton; M. Rescigno; F. Rimondi; L. Ristori; A. Robson; T. Rodriguez; S. Rolli; M. Ronzani; R. Roser; J. L. Rosner; F. Ruffini; A. Ruiz; J. Russ; V. Rusu; W. K. Sakumoto; Y. Sakurai; L. Santi; K. Sato; V. Saveliev; A. Savoy-Navarro; P. Schlabach; E. E. Schmidt; T. Schwarz; L. Scodellaro; F. Scuri; S. Seidel; Y. Seiya; A. Semenov; F. Sforza; S. Z. Shalhout; T. Shears; P. F. Shepard; M. Shimojima; M. Shochet; I. Shreyber-Tecker; A. Simonenko; K. Sliwa; J. R. Smith; F. D. Snider; V. Sorin; H. Song; M. Stancari; R. St. Denis; D. Stentz; J. Strologas; Y. Sudo; A. Sukhanov; I. Suslov; K. Takemasa; Y. Takeuchi; J. Tang; M. Tecchio; P. K. Teng; J. Thom; E. Thomson; V. Thukral; D. Toback; S. Tokar; K. Tollefson; T. Tomura; D. Tonelli; S. Torre; D. Torretta; P. Totaro; M. Trovato; F. Ukegawa; S. Uozumi; F. Vzquez; G. Velev; C. Vellidis; C. Vernieri; M. Vidal; R. Vilar; J. Vizn; M. Vogel; G. Volpi; P. Wagner; R. Wallny; S. M. Wang; D. Waters; W. C. Wester III; D. Whiteson; A. B. Wicklund; S. Wilbur; H. H. Williams; J. S. Wilson; P. Wilson; B. L. Winer; P. Wittich; S. Wolbers; H. Wolfe; T. Wright; X. Wu; Z. Wu; K. Yamamoto; D. Yamato; T. Yang; U. K. Yang; Y. C. Yang; W. -M. Yao; G. P. Yeh; K. Yi; J. Yoh; K. Yorita; T. Yoshida; G. B. Yu

2014-03-10T23:59:59.000Z

368

New limits for neutrinoless tau decays  

E-Print Network [OSTI]

double beta decays, neutrino oscillations, Z!l11l22 decays, and other rare pro- cesses. In particular, there are strict limits on muon neutrino- less decays: B(m!eg),4.9310211 and B(m!eee),2.4 310212 at 90% confidence level @18#. However, lepton num- ber... particles and on the new coupling constants. The most optimistic branching fraction predictions are at the level of about 1026. Constraints on lepton flavor violation come from studies of rare and forbidden K , p, and m decays, e-m conversions, neutrinoless...

Ammar, Raymond G.; Baringer, Philip S.; Bean, Alice; Besson, David Zeke; Coppage, Don; Darling, C.; Davis, Robin E. P.; Kotov, S.; Kravchenko, I.; Kwak, Nowhan; Zhou, L.

1998-05-01T23:59:59.000Z

369

Search for Neutrinoless {tau} Decays Involving {pi}{sup 0} or {eta} Mesons  

SciTech Connect (OSTI)

We have searched for lepton flavor violating decays of the {tau} lepton using final states with an electron or a muon and one or two {pi}{sup 0} or {eta} mesons but no neutrinos. The data used in the search were collected with the CLEO II detector at the Cornell Electron Storage Ring (CESR) and correspond to an integrated luminosity of 4.68 fb{sup {minus}1} . No evidence for signals was found, resulting in much improved limits on the branching fractions for the one-meson modes and the first upper limits for the two-meson modes. {copyright} {ital 1997} {ital The American Physical Society}

Bonvicini, G.; Cinabro, D.; Greene, R.; Perera, L.P.; Zhou, G.J. [Wayne State University, Detroit, Michigan 48202 (United States)] [Wayne State University, Detroit, Michigan 48202 (United States); Barish, B.; Chadha, M.; Chan, S.; Eigen, G.; Miller, J.S.; OGrady, C.; Schmidtler, M.; Urheim, J.; Weinstein, A.J.; Wuerthwein, F. [California Institute of Technology, Pasadena, California 91125 (United States)] [California Institute of Technology, Pasadena, California 91125 (United States); Asner, D.M.; Bliss, D.W.; Brower, W.S.; Masek, G.; Paar, H.P.; Prell, S.; Sharma, V. [University of California, San Diego, La Jolla, California 92093 (United States)] [University of California, San Diego, La Jolla, California 92093 (United States); Gronberg, J.; Hill, T.S.; Kutschke, R.; Lange, D.J.; Menary, S.; Morrison, R.J.; Nelson, H.N.; Nelson, T.K.; Qiao, C.; Richman, J.D.; Roberts, D.; Ryd, A.; Witherell, M.S. [University of California, Santa Barbara, California 93106 (United States)] [University of California, Santa Barbara, California 93106 (United States); Balest, R.; Behrens, B.H.; Cho, K.; Ford, W.T.; Park, H.; Rankin, P.; Roy, J.; Smith, J.G. [University of Colorado, Boulder, Colorado 80309-0390 (United States)] [University of Colorado, Boulder, Colorado 80309-0390 (United States); Alexander, J.P.; Bebek, C.; Berger, B.E.; Berkelman, K.; Bloom, K.; Cassel, D.G.; Cho, H.A.; Coffman, D.M.; Crowcroft, D.S.; Dickson, M.; Drell, P.S.; Ecklund, K.M.; Ehrlich, R.; Elia, R.; Foland, A.D.; Gaidarev, P.; Galik, R.S.; Gittelman, B.; Gray, S.W.; Hartill, D.L.; Heltsley, B.K.; Hopman, P.I.; Kandaswamy, J.; Kim, P.C.; Kreinick, D.L.; Lee, T.; Liu, Y.; Ludwig, G.S.; Masui, J.; Mevissen, J.; Mistry, N.B.; Ng, C.R.; Nordberg, E.; Ogg, M.; Patterson, J.R.; Peterson, D.; Riley, D.; Soffer, A.; Valant-Spaight, B.; Ward, C. [Cornell University, Ithaca, New York 14853 (United States)] [Cornell University, Ithaca, New York 14853 (United States); Athanas, M.; Avery, P.; Jones, C.D.; Lohner, M.; Prescott, C.; Yelton, J.; Zheng, J. [University of Florida, Gainesville, Florida 32611 (United States)] [University of Florida, Gainesville, Florida 32611 (United States); Brandenburg, G.; Briere, R.A.; Gao, Y.S.; Kim, D.Y.; Wilson, R.; Yamamoto, H. [Harvard University, Cambridge, Massachusetts 02138 (United States)] [Harvard University, Cambridge, Massachusetts 02138 (United States); Browder, T.E.; Li, F.; Li, Y.; Rodriguez, J.L. [University at Hawaii at Manoa, Honolulu, Hawaii 96822 (United States)] [University at Hawaii at Manoa, Honolulu, Hawaii 96822 (United States); Bergfeld, T.; Eisenstein, B.I.; Ernst, J.; and others

1997-08-01T23:59:59.000Z

370

Addendum to Distinguishing Spins in Decay Chains at the Large Hadron Collider.  

E-Print Network [OSTI]

ar X iv :h ep -p h/ 06 06 21 2v 1 2 0 Ju n 20 06 Preprint typeset in JHEP style - PAPER VERSION CavendishHEP06/15 Addendum to Distinguishing Spins in Decay Chains at the Large Hadron Collider? Christiana Athanasiou1, Christopher G. Lester2... mass distributions of the three observable two-body combinations: dileptons (mll), quark- or antiquark-jet plus positive lepton (mjl+), and jet plus negative lepton (mjl?).1 If P (m|S) represents the normalized probability distribution of any one...

Athanasiou, Christiana; Lester, Christopher G; Smillie, Jennifer M; Webber, Bryan R

371

Meson masses and decay constants from unquenched lattice QCD  

SciTech Connect (OSTI)

We report results for the masses of the flavor nonsinglet light 0{sup ++}, 1{sup --}, and 1{sup +-} mesons from unquenched lattice QCD at two lattice spacings. The twisted mass formalism was used with two flavors of sea quarks. For the 0{sup ++} and 1{sup +-} mesons we look for the effect of decays on the mass dependence. For the light vector mesons we study the chiral extrapolations of the mass. We report results for the leptonic and transverse decay constants of the {rho} meson. We test the mass dependence of the KSRF relations, between the mass, leptonic coupling constant, and strong coupling of the rho meson.

Jansen, K. [DESY, Zeuthen, Platanenallee 6, D-15738 Zeuthen (Germany); McNeile, C. [Department of Physics and Astronomy, Kelvin Building, University of Glasgow, Glasgow, G12 8QQ (United Kingdom); Michael, C. [Theoretical Physics Division, Department of Mathematical Sciences, University of Liverpool, Liverpool L69 3BX (United Kingdom); Urbach, C. [Humboldt-Universitaet zu Berlin, Institut fuer Physik Mathematisch-Naturwissenschaftliche Fakultaet I, Theorie der Elementarteilchen/Phaenomenologie, Newtonstrasse 15, 12489 Berlin (Germany)

2009-09-01T23:59:59.000Z

372

Leading-order hadronic contribution to g-2 from lattice QCD  

SciTech Connect (OSTI)

We calculate the leading-order hadronic correction to the anomalous magnetic moments of each of the three charged leptons in the Standard Model: the electron, muon and tau. Working in two-flavor lattice QCD, we address essentially all sources of systematic error: lattice artifacts, finite-size effects, quark-mass extrapolation, momentum extrapolation and disconnected diagrams. The only remaining significant systematic error, the exclusion of the strange and charm quark contributions, will be addressed in our four-flavor calculation. We achieve a statistical accuracy of 2% or better for the physical values for each of the three leptons and the systematic errors are at most comparable.

Dru Renner, Xu Feng, Karl Jansen, Marcus Petschlies

2011-03-01T23:59:59.000Z

373

A study of the appearance of tau neutrinos from a gamma ray burst by detecting their horizontal electromagnetic showers  

E-Print Network [OSTI]

We explore the possibilty of detecting horizontal electromagnetic showers of tau neutrinos from individual gamma ray bursts, in large scale detectors like HiRes and Telescope Array. We study the role of the parameters of a gamma ray burst in determining the expected number of tau events from that burst. The horizontal beam of tau leptons produce visible signals in the atmosphere. We find that there is a slim chance of observing tau lepton appearances from GRBs with Telescope Array. The number of signals is strongly dependent on the Lorentz factor $\\Gamma$, redshift $z$ of a GRB, energy emitted in muon neutrinos and antineutrinos $E_{\

Nayantara Gupta

2003-05-30T23:59:59.000Z

374

Atmospheric and Solar neutrinos in the light of the SuperKamiokande results  

E-Print Network [OSTI]

The hierarchy $\\Delta m^2_{atm} \\gg \\Delta m^2_\\odot$ and the large $\\theta_{23}$ mixing angle, as suggested by neutrino oscillation experiments, can be accounted for by a variety of lepton flavour models. A dichotomy emerges: i) Models were all neutrino masses are bounded by $m_{atm}\\equiv (\\Delta m^2_{atm})^{1/2}\\approx 0.03 eV$; ii) Models of quasi-degenerate neutrinos. It is shown how these different patterns of neutrino masses may arise from different lepton flavour symmetries. Physical implications are discussed in the various cases.

Riccardo Barbieri

1999-01-07T23:59:59.000Z

375

`Natural Masslessness Conservation' for neutrinos in two Higgs-doublet models  

E-Print Network [OSTI]

We present a model which supplements the Standard Electroweak Model with three right-handed neutrinos and one extra scalar doublet which does not develop a vacuum expectation value. With the aid of a discrete symmetry the neutrinos are kept strictly massless. This model has several interesting features. It has unsuppressed lepton flavour violating processes, in particular $\\mu \\rightarrow e \\gamma$, hinting at the possibility that these may soon be within experimental reach. The $Z$ and $W$ interactions become non-diagonal at one loop level. In particular, a non-trivial leptonic mixing matrix is seen to arise from the clash between the charged gauge boson and the charged scalar interactions.

A. Barroso; Joao P. Silva

1994-04-10T23:59:59.000Z

376

How opaque is the Earth to ultrahigh energy neutrinos?  

Science Journals Connector (OSTI)

We carry out a numerical calculation of ultrahigh energy neutrino propagation through the Earth, taking into account the neutrino regeneration process in both neutral current and charged current neutrino interactions. The attenuation of neutrinos traversing the Earth (shadow effect) is determined, and the fluxes of ?-induced upward-going leptons (muon and tau) are obtained at the Earths surface and for two configurations of the neutrino flavor in the incident neutrino flux (????? mixing). The implications of these results are discussed in the context of the possibility of detection of ?-induced leptons in the next round of fluorescent telescopes such as the AUGER detector.

C. E. Navia; C. R. A. Augusto; H. M. Portella; H. Shigueoka

2003-05-23T23:59:59.000Z

377

Final state interactions at the threshold of Higgs boson pair production  

E-Print Network [OSTI]

We study the effect of final state interactions at the threshold of Higgs boson pair production in the Glashow-Weinberg-Salam model. We consider three major processes of the pair production in the model: lepton pair annihilation, ZZ fusion, and WW fusion. We find that the corrections caused by the effect for these processes are markedly different. According to our results, the effect can cause non-negligible corrections to the cross sections for lepton pair annihilation and small corrections for ZZ fusion, and this effect is negligible for WW fusion.

Zhang, Zhentao

2015-01-01T23:59:59.000Z

378

"Nucleon-Structural" Corrections to First Forbidden Unique Beta Transitions  

Science Journals Connector (OSTI)

The coupling of leptons to a conserved isovector current is shown to result in a small change in the shape of the electron momentum spectrum in forbidden unique beta transitions. The experimental advantages and disadvantages of studying such nucleon-structural effects in forbidden unique transitions rather than in allowed transitions, as suggested by Gell-Mann, are discussed. To facilitate the computations, the betadecay interaction Hamiltonian is written in a form in which the terms leading to the "nucleon-structural" corrections associated with the coupling of the leptons to a conserved isovector current and the terms leading to effects of comparable order of magnitude are simply identified.

J. F. Dreitlein

1959-12-15T23:59:59.000Z

379

Supersymmetry Searches at the LHC  

E-Print Network [OSTI]

The search for Beyond the Standard Model (BSM) physics is one of the major tasks of the LHC, CERN. In these proceedings, I review the status of searches for Supersymmetry by the ATLAS and CMS collaborations. The efforts in both the hadronic and leptonic search channels are presented. A special focus is placed on the treatment of approximately one inverse femtobarn of early LHC data, and examples of background estimation techniques in such a dataset are given. Phenomenologically, besides "typical" mSUGRA scenarios, signatures based on prompt and non-pointing photons, as well as long-lived leptons and hadrons (R-hadrons) are covered.

Oleg Brandt

2008-08-21T23:59:59.000Z

380

Fermilab Steering Group Report  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

E: Muon-to-electron conversion in nuclei E: Muon-to-electron conversion in nuclei With the discovery of neutrino masses and mixings we have learned that neutral lepton flavor quantum numbers are violated in nature. An immediate question arises: "Does lepton flavor violation also occur at an appreciable rate with the charged leptons?" While the Standard Model predicts negligible rates for charged lepton flavor violation, many models, including various versions of supersymmetry, predict CLFV at an appreciable and potentially observable rate. Searches for CLFV are the most powerful and promising probes for new physics at and above the TeV scale. illustration The sensitivity to a new physics scale Λ in a μ→e conversion experiment in 48Ti that can probe a normalized capture rate of 10-17 and 10-19, and a μ→eγ search that is sensitive to a branching ratio of 10-13. The sensitivity is plotted as a function of κ, a parameter that interpolates between a fl avor transition magnetic moment-type operator (κ>1). Also depicted is the region already excluded from searches for both μ→eγ and μ→e conversion in 48Ti.

Note: This page contains sample records for the topic "leptons leptons leptons" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


381

taudec-web.dvi  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

τ τ -LEPTON DECAY PARAMETERS Updated August 2011 by A. Stahl (RWTH Aachen). The purpose of the measurements of the decay parameters (i.e., Michel parameters) of the τ is to determine the structure (spin and chirality) of the current mediating its decays. Leptonic Decays: The Michel parameters are extracted from the energy spectrum of the charged daughter lepton ℓ = e, µ in the decays τ → ℓν ℓ ν τ . Ignoring radiative corrections, neglect- ing terms of order (m ℓ /m τ ) 2 and (m τ / √ s) 2 , and setting the neutrino masses to zero, the spectrum in the laboratory frame reads dΓ dx = G 2 τ ℓ m 5 τ 192 π 3 × f 0 (x) + ρf 1 (x) + η m ℓ m τ f 2 (x) - P τ [ξg 1 (x) + ξδg 2 (x)] , (1) with f 0 (x) = 2 - 6 x 2 + 4 x 3 f 1 (x) = - 4 9 + 4 x 2 - 32 9 x 3 g 1 (x) = - 2 3 + 4 x - 6 x 2 + 8 3 x 3 f 2 (x) = 12 (1 - x) 2 g 2 (x) = 4 9 - 16 3 x + 12 x 2 - 64 9 x 3 . The quantity x is the fractional energy of the daughter lepton ℓ, i.e., x = E ℓ /E ℓ,max ≈

382

s049.dvi  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

± ± /B 0 ADMIXTURE B DECAY MODES B DECAY MODES B DECAY MODES B DECAY MODES The branching fraction measurements are for an admixture of B mesons at the Υ(4S). The values quoted assume that B(Υ(4S) → B B) = 100%. For inclusive branching fractions, e.g., B → D ± anything, the values usually are multiplicities, not branching fractions. They can be greater than one. B modes are charge conjugates of the modes below. Reactions indicate the weak decay vertex and do not include mixing. Scale factor/ Mode Fraction (Γ i /Γ) Confidence level Semileptonic and leptonic modes Semileptonic and leptonic modes Semileptonic and leptonic modes Semileptonic and leptonic modes Γ 1 B → e + ν e anything [a] ( 10.73 ± 0.28 ) % Γ 2 B → p e + ν e anything < 5.9 × 10 -4 CL=90% Γ 3 B → µ + ν µ anything [a] Γ 4 B → + ν anything [a,b] ( 10.73 ± 0.28 ) % Γ 5 B → D - + ν anything [b] ( 2.8 ± 0.9 ) % Γ 6 B → D 0 + ν

383

Looking for hints of a reconstructible seesaw model at the Large Hadron Collider  

E-Print Network [OSTI]

We study the production of heavy neutrinos at the Large Hadron Collider (LHC) through the dominant s-channel production mode as well as the vector boson fusion (VBF) process. We consider the TeV scale minimal linear seesaw model containing two heavy singlets with opposite lepton number. This model is fully reconstructible from oscillation data apart from an overall normalization constant which can be constrained from meta-stability of the electroweak vacuum and bounds coming from lepton flavor violation (LFV) searches. Dirac nature of heavy neutrinos in this model implies suppression of the conventional same-sign-dilepton signal at the LHC. We analyze the collider signatures with tri-lepton final state and missing transverse energy as well as VBF type signals which are characterized by two additional forward tagged jets. Our investigation reveals that due to stringent constraints on light-heavy mixing coming from LFV and meta-stability bounds, the model can be explored only for light to moderate mass range of heavy neutrinos. We also note that in case of a positive signal, flavor counting of the final tri-lepton channel can give information about the mass hierarchy of the light neutrinos.

Gulab Bambhaniya; Srubabati Goswami; Subrata Khan; Partha Konar; Tanmoy Mondal

2014-10-21T23:59:59.000Z

384

CDF/ANAL/TOP/CDFR/8633 Version 1.0  

E-Print Network [OSTI]

uncertainties if Jet Energy Scale uncertainty is reduced with statistics of ttbar candidates. At present and muons of cosmic rays are vetoed in the identi#12;cation of the lepton. We also reject events where the jet energy corrections of level 4. To identify the jets from W boson and other two from bs, we require

385

An Overview on Muon Physics  

SciTech Connect (OSTI)

A summary of the present status of the charged lepton flavor violation search with muons is presented. The relevant measurements (g-2){sub {mu}}, the {mu} {sup +}{yields} e{sup +} {gamma} decay and the direct muon-to-electron conversion projects are briefly reviewed.

Piredda, Giancarlo [INFN Sezione di Roma, Dipartimento di Fisica, Universita Sapienza (Italy)

2011-10-06T23:59:59.000Z

386

Calculation of size for bound-state constituents  

E-Print Network [OSTI]

Elements are given of a calculation that identifies the size of a proton in the Schroedinger equation for lepton-proton bound states, using the renormalization group procedure for effective particles (RGPEP) in quantum field theory, executed only up to the second order of expansion in powers of the coupling constant. Already in this crude approximation, the extraction of size of a proton from bound-state observables is found to depend on the lepton mass, so that the smaller the lepton mass the larger the proton size extracted from the same observable bound-state energy splitting. In comparison of Hydrogen and muon-proton bound-state dynamics, the crude calculation suggests that the difference between extracted proton sizes in these two cases can be a few percent. Such values would match the order of magnitude of currently discussed proton-size differences in leptonic atoms. Calculations using the RGPEP of higher order than second are required for a precise interpretation of the energy splittings in terms of the proton size in the Schroedinger equation. Such calculations should resolve the conceptual discrepancy between two conditions: that the renormalization group scale required for high accuracy calculations based on the Schroedinger equation is much smaller than the proton mass (on the order of a root of the product of reduced and average masses of constituents) and that the energy splittings due to the physical proton size can be interpreted ignoring corrections due to the effective nature of constituents in the Schr\\"odinger equation.

Stanislaw D. Glazek

2014-06-01T23:59:59.000Z

387

Direct Detection of Warm Dark Matter in the X-Ray  

Science Journals Connector (OSTI)

We point out a serendipitous link between warm dark matter (WDM) models for structure formation on the one hand and the high-sensitivity energy range (1-10 keV) for X-ray photon detection on the Chandra and XMM-Newton observatories on the other. This fortuitous match may provide either a direct detection of the dark matter or the exclusion of many candidates. We estimate expected X-ray fluxes from field galaxies and clusters of galaxies if the dark matter halos of these objects are composed of WDM candidate particles with rest masses in the structure formation-preferred range (~1 to ~20 keV) and with small radiative decay branches. Existing observations lead us to conclude that for singlet neutrinos (possessing a very small mixing with active neutrinos) to be a viable WDM candidate they must have rest masses 5 keV in the zero lepton number production mode. Future deeper observations may detect or exclude the entire parameter range for the zero lepton number case, perhaps restricting the viability of singlet neutrino WDM models to those where singlet production is driven by a significant lepton number. The Constellation X project has the capability to detect/exclude singlet neutrino WDM for lepton number values up to 10% of the photon number. We also consider diffuse X-ray background constraints on these scenarios. These same X-ray observations additionally may constrain parameters of active neutrino and gravitino WDM candidates.

Kevork Abazajian; George M. Fuller; Wallace H. Tucker

2001-01-01T23:59:59.000Z

388

Bulk viscosity and r-modes of neutron stars  

E-Print Network [OSTI]

The bulk viscosity due to the non-leptonic process involving hyperons in $K^-$ condensed matter is discussed here. We find that the bulk viscosity is modified in a superconducting phase. Further, we demonstrate how the exotic bulk viscosity coefficient influences $r$-modes of neutron stars which might be sources of detectable gravitational waves.

Debarati Chatterjee; Debades Bandyopadhyay

2008-08-08T23:59:59.000Z

389

Search for the weak decays $J/?\\to D^{(*)}_{s}e?_{e}$  

E-Print Network [OSTI]

Using a sample of $2.25\\times 10^8$ $J/\\psi$ events collected with the BESIII detector at the BEPCII collider, we search for the $J/\\psi$ semi-leptonic weak decay $J/\\psi \\to D^{-}_{s} e^{+}\

BESIII collaboration; M. Ablikim; M. N. Achasov; X. C. Ai; O. Albayrak; M. Albrecht; D. J. Ambrose; A. Amoroso; F. F. An; Q. An; J. Z. Bai; R. Baldini Ferroli; Y. Ban; D. W. Bennett; J. V. Bennett; M. Bertani; D. Bettoni; J. M. Bian; F. Bianchi; E. Boger; O. Bondarenko; I. Boyko; R. A. Briere; H. Cai; X. Cai; O. Cakir; A. Calcaterra; G. F. Cao; S. A. Cetin; J. F. Chang; G. Chelkov; G. Chen; H. S. Chen; H. Y. Chen; J. C. Chen; M. L. Chen; S. J. Chen; X. Chen; X. R. Chen; Y. B. Chen; H. P. Cheng; X. K. Chu; Y. P. Chu; G. Cibinetto; D. Cronin-Hennessy; H. L. Dai; J. P. Dai; D. Dedovich; Z. Y. Deng; A. Denig; I. Denysenko; M. Destefanis; F. De Mori; Y. Ding; C. Dong; J. Dong; L. Y. Dong; M. Y. Dong; S. X. Du; P. F. Duan; J. Z. Fan; J. Fang; S. S. Fang; X. Fang; Y. Fang; L. Fava; F. Feldbauer; G. Felici; C. Q. Feng; E. Fioravanti; C. D. Fu; Q. Gao; Y. Gao; I. Garzia; K. Goetzen; W. X. Gong; W. Gradl; M. Greco; M. H. Gu; Y. T. Gu; Y. H. Guan; A. Q. Guo; L. B. Guo; T. Guo; Y. Guo; Y. P. Guo; Z. Haddadi; A. Hafner; S. Han; Y. L. Han; F. A. Harris; K. L. He; Z. Y. He; T. Held; Y. K. Heng; Z. L. Hou; C. Hu; H. M. Hu; J. F. Hu; T. Hu; Y. Hu; G. M. Huang; G. S. Huang; H. P. Huang; J. S. Huang; X. T. Huang; Y. Huang; T. Hussain; Q. Ji; Q. P. Ji; X. B. Ji; X. L. Ji; L. L. Jiang; L. W. Jiang; X. S. Jiang; J. B. Jiao; Z. Jiao; D. P. Jin; S. Jin; T. Johansson; A. Julin; N. Kalantar-Nayestanaki; X. L. Kang; X. S. Kang; M. Kavatsyuk; B. C. Ke; R. Kliemt; B. Kloss; O. B. Kolcu; B. Kopf; M. Kornicer; W. Kuehn; A. Kupsc; W. Lai; J. S. Lange; M. Lara; P. Larin; C. H. Li; Cheng Li; D. M. Li; F. Li; G. Li; H. B. Li; J. C. Li; Jin Li; K. Li; K. Li; P. R. Li; T. Li; W. D. Li; W. G. Li; X. L. Li; X. M. Li; X. N. Li; X. Q. Li; Z. B. Li; H. Liang; Y. F. Liang; Y. T. Liang; G. R. Liao; D. X. Lin; B. J. Liu; C. L. Liu; C. X. Liu; F. H. Liu; Fang Liu; Feng Liu; H. B. Liu; H. H. Liu; H. H. Liu; H. M. Liu; J. Liu; J. P. Liu; J. Y. Liu; K. Liu; K. Y. Liu; L. D. Liu; Q. Liu; S. B. Liu; X. Liu; X. X. Liu; Y. B. Liu; Z. A. Liu; Zhiqiang Liu; Zhiqing Liu; H. Loehner; X. C. Lou; H. J. Lu; J. G. Lu; R. Q. Lu; Y. Lu; Y. P. Lu; C. L. Luo; M. X. Luo; T. Luo; X. L. Luo; M. Lv; X. R. Lyu; F. C. Ma; H. L. Ma; L. L. Ma; Q. M. Ma; S. Ma; T. Ma; X. N. Ma; X. Y. Ma; F. E. Maas; M. Maggiora; Q. A. Malik; Y. J. Mao; Z. P. Mao; S. Marcello; J. G. Messchendorp; J. Min; T. J. Min; R. E. Mitchell; X. H. Mo; Y. J. Mo; H. Moeini; C. Morales Morales; K. Moriya; N. Yu. Muchnoi; H. Muramatsu; Y. Nefedov; F. Nerling; I. B. Nikolaev; Z. Ning; S. Nisar; S. L. Niu; X. Y. Niu; S. L. Olsen; Q. Ouyang; S. Pacetti; P. Patteri; M. Pelizaeus; H. P. Peng; K. Peters; J. L. Ping; R. G. Ping; R. Poling; Y. N. Pu; M. Qi; S. Qian; C. F. Qiao; L. Q. Qin; N. Qin; X. S. Qin; Y. Qin; Z. H. Qin; J. F. Qiu; K. H. Rashid; C. F. Redmer; H. L. Ren; M. Ripka; G. Rong; X. D. Ruan; V. Santoro; A. Sarantsev; M. Savri; K. Schoenning; S. Schumann; W. Shan; M. Shao; C. P. Shen; P. X. Shen; X. Y. Shen; H. Y. Sheng; M. R. Shepherd; W. M. Song; X. Y. Song; S. Sosio; S. Spataro; B. Spruck; G. X. Sun; J. F. Sun; S. S. Sun; Y. J. Sun; Y. Z. Sun; Z. J. Sun; Z. T. Sun; C. J. Tang; X. Tang; I. Tapan; E. H. Thorndike; M. Tiemens; D. Toth; M. Ullrich; I. Uman; G. S. Varner; B. Wang; B. L. Wang; D. Wang; D. Y. Wang; K. Wang; L. L. Wang; L. S. Wang; M. Wang; P. Wang; P. L. Wang; Q. J. Wang; S. G. Wang; W. Wang; X. F. Wang; Y. D. Wang; Y. F. Wang; Y. Q. Wang; Z. Wang; Z. G. Wang; Z. H. Wang; Z. Y. Wang; D. H. Wei; J. B. Wei; P. Weidenkaff; S. P. Wen; U. Wiedner; M. Wolke; L. H. Wu; Z. Wu; L. G. Xia; Y. Xia; D. Xiao; Z. J. Xiao; Y. G. Xie; Q. L. Xiu; G. F. Xu; L. Xu; Q. J. Xu; Q. N. Xu; X. P. Xu; L. Yan; W. B. Yan; W. C. Yan; Y. H. Yan; H. X. Yang; L. Yang; Y. Yang; Y. X. Yang; H. Ye; M. Ye; M. H. Ye; J. H. Yin; B. X. Yu; C. X. Yu; H. W. Yu; J. S. Yu; C. Z. Yuan; W. L. Yuan; Y. Yuan; A. Yuncu; A. A. Zafar; A. Zallo; Y. Zeng; B. X. Zhang; B. Y. Zhang; C. Zhang; C. C. Zhang; D. H. Zhang; H. H. Zhang; H. Y. Zhang; J. J. Zhang; J. L. Zhang; J. Q. Zhang; J. W. Zhang; J. Y. Zhang; J. Z. Zhang; K. Zhang; L. Zhang; S. H. Zhang; X. J. Zhang; X. Y. Zhang; Y. Zhang; Y. H. Zhang; Z. H. Zhang; Z. P. Zhang; Z. Y. Zhang; G. Zhao; J. W. Zhao; J. Y. Zhao; J. Z. Zhao; Lei Zhao; Ling Zhao; M. G. Zhao; Q. Zhao; Q. W. Zhao; S. J. Zhao; T. C. Zhao; Y. B. Zhao; Z. G. Zhao; A. Zhemchugov; B. Zheng; J. P. Zheng; W. J. Zheng; Y. H. Zheng; B. Zhong; L. Zhou; Li Zhou; X. Zhou; X. K. Zhou; X. R. Zhou; X. Y. Zhou; K. Zhu; K. J. Zhu; S. Zhu; X. L. Zhu; Y. C. Zhu; Y. S. Zhu; Z. A. Zhu; J. Zhuang; B. S. Zou; J. H. Zou

2014-10-30T23:59:59.000Z

390

Single spin asymmetries and vector meson production in DIS  

E-Print Network [OSTI]

We discuss possible measurements and origins of single spin asymmetries in DIS and of some unusual spin properties of vector mesons produced in lepton- nucleon, photon-nucleon and photon-photon interactions. Such effects have already been observed in other processes.

Mauro Anselmino; Francesco Murgia

1998-07-14T23:59:59.000Z

391

CP-Violation in the Renormalizable Theory of Weak Interaction  

Science Journals Connector (OSTI)

......3 (1977) pp. 1108-1110 Spontaneous CP Violation in the Vectorlike Model of the...pp. 978-990 Lepton-Quark Symmetry, CP-Violation and the Decay microe gamma Kazuo...224-228 Toward a Unified Description of CP Violation Kazuo Koike Progress of Theoretical......

Makoto Kobayashi; Toshihide Maskawa

1973-02-01T23:59:59.000Z

392

Evidence for a Higgs boson in tau decays with the CMS detector  

E-Print Network [OSTI]

In this thesis, I describe the search for a Higgs boson through its decay to a pair of tan leptons with the tau-pair subsequently decaying to ail electron, a muon, and neutrinos. The search is performed using data collected ...

Dutta, Valentina

2014-01-01T23:59:59.000Z

393

Search for Higgs boson production in oppositely charged dilepton and missing energy final states in 9.7??fb(?1) of pp-bar collisions at s?=1.96??TeV  

E-Print Network [OSTI]

We present a search for the Higgs boson in final states with two oppositely charged leptons and large missing transverse energy as expected in H?WW??????? decays. The events are selected from the full Run II data sample of 9.7??fb(?1) of pp...

Baringer, Philip S.; Bean, Alice; Chen, Gemma; Clutter, Jeffrey Scott; Sekaric, Jadranka; Wilson, Graham Wallace; Abazov, V. M.; Abbott, B.; Acharya, B. S.; Adams, M.; Adams, T.; Alexeev, G. D.; Alkhazov, G.; Alton, A.; Askew, A.; Atkins, S.

2013-09-17T23:59:59.000Z

394

Nuclear effects in electroproduction  

Science Journals Connector (OSTI)

We consider the deep inelastic lepton-nuclear scattering taking into account the binding of nucleons and two body correlations. It is shown that the experimental data in the x>1 region are well reproduced when two-body short-range correlations are taken into account.

S. V. Akulinichev and S. Shlomo

1986-04-01T23:59:59.000Z

395

UCSB--HEP--95--08 Stanford--HEP--95--01  

E-Print Network [OSTI]

Dynamics and Heavy Quark Effective Theory 8 C. Plan of the Review 10 II. Theory of Leptonic, CA 94305 pat@picasso.slac.stanford.edu Abstract We review the experimental measurements the magnitudes of two fundamental parameters of the standard model, the Cabibbo­Kobayashi­Maskawa matrix elements

Fygenson, Deborah Kuchnir

396

Search for narrow t(t)over-bar resonances in p(p)over-bar collisions at root s=1.8 TeV  

E-Print Network [OSTI]

A search for narrow resonances that decay into t (t) over bar pairs has been performed using 130 pb(-1) of data in the lepton + jets channel collected by the DO detector in p (p) over bar collisions at roots=1.8 TeV. There ...

Baringer, Philip S.; Bean, Alice; Coppage, Don; Hebert, C.

2004-06-01T23:59:59.000Z

397

Transition Operators Entering Neutrinoles Double Electron Capture to Excited Nuclear States  

E-Print Network [OSTI]

We construct the effective transition operators relevant for neutrinoless double electron capture leading to final nuclear states different than $0^{+}$. From the structure of these operators we see that, if such a process is observed experimentally, it will be very helpful in singling out the very important light neutrino mass contribution from the other lepton violating mechanisms

J. D. Vergados

2011-08-02T23:59:59.000Z

398

Physics of Binary Information  

E-Print Network [OSTI]

Basic concepts of theoretical particle physics, including quantum mechanics and Poincar\\'e invariance, the leptonic mass spectrum and the proton mass, can be derived, without reference to first principles, from intrinsic properties of the simplest elements of information represented by binary data. What we comprehend as physical reality is, therefore, a reflection of mathematically determined logical structures, built from elements of binary data.

Walter Smilga

2005-05-05T23:59:59.000Z

399

Review of particle properties  

Science Journals Connector (OSTI)

This review of the properties of leptons, mesons, and baryons is an updating of the Review of Particle Properties, Particle Data Group [Phys. Lett. 111B (1982)]. Data are evaluated, listed, averaged, and summarized in tables. Numerous tables, figures, and formulae of interest to particle physicists are also included. A data booklet is available.

C. G. Wohl; R. N. Cahn; A. Rittenberg; T. G. Trippe; G. P. Yost; F. C. Porter; J. J. Hernandez; L. Montanet; R. E. Hendrick; R. L. Crawford; M. Roos; N. A. Trnqvist; G. Hhler; M. Aguilar-Benitez; T. Shimada; M. J. Losty; G. P. Gopal; Ch. Walck; R. E. Shrock; R. Frosch; L. D. Roper; W. P. Trower; B. Armstrong (Particle Data Group)

1984-04-01T23:59:59.000Z

400

REPORT OF RESEARCH ACTIVITIES FOR THE YEARS 2000 - 2003; HIGH ENERGY PHYSICS GROUP; SOUTHERN METHODIST UNIVERSITY; EXPERIMENTAL TASK A AND THEORY TASK B  

SciTech Connect (OSTI)

The experimental program in High Energy Physics at SMU was initiated in 1992. Its main goal is the search for new physics phenomena beyond the Standard Model (SSC, LHC) and the study of the properties of heavy quarks and leptons (CLEO, BTeV).

Dr. Ryszard Stroynowski

2003-07-01T23:59:59.000Z

Note: This page contains sample records for the topic "leptons leptons leptons" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


401

Electric Charge Quantization in Standard Model  

E-Print Network [OSTI]

In the framework of Standard Model for the arbitrary values of Higgs and fermions fields hypercharges, taking into account parity invariance of electromagnetic interaction, expressions for the fermions charges, testifying the electric charge quantization are obtained. From the chiral anomalies cancellation condition within one family of leptons and quarks, numerical values of fermions charges, coinciding with standard values of charges have been obtained.

O. B. Abdinov; F. T. Khalil-zade; S. S. Rzaeva

2008-07-28T23:59:59.000Z

402

Nuclear p_t broadening at HERMES  

E-Print Network [OSTI]

The first direct measurement of p_t-broadening effects in cold nuclear matter has been studied as a function of several kinematic variables for different hadron types. The data have been accumulated by the HERMES experiment at DESY, in which the HERA 27.6 GeV lepton beam scattered off several nuclear gas targets.

Yves Van Haarlem; Anton Jgoun; Pasquale Di Nezza

2007-04-27T23:59:59.000Z

403

Nuclear physics aspects of double beta decay  

E-Print Network [OSTI]

Comprehensive description of the phenomenology of the $\\beta\\beta$ decay is given, with emphasis on the nuclear physics aspects. After a brief review of the neutrino oscillation results and of motivation to test the lepton number conservation, the mechanism of the $0\

Petr Vogel

2008-07-15T23:59:59.000Z

404

Search for Rare 3 and 4-Body D0 Decays at FNAL E791  

E-Print Network [OSTI]

Limits at the 10**-4 level are reported for rare and forbidden decays of the D0 charm meson to a pair of leptons and either a vector meson or two pseudoscalar mesons. Of these searches, 18 are investigations of decays without previous published results; several others have significantly improved sensitivity over previous results.

Fermilab E791 Collaboration; D. J. Summers

2000-11-21T23:59:59.000Z

405

Model independent determination of the light-cone wave functions for exclusive processes  

E-Print Network [OSTI]

We present a method to compute, by numerical simulations of lattice QCD, the light-cone wave functions which enter exclusive processes at large momentum transfer, such as electromagnetic elastic scatterings, or exclusive semi-leptonic decays as B -> pi (B -> rho) and radiative decays as B -> K* gamma. The method is based on first principles and does not require any model assumption.

Aglietti, U; Corb, G; Franco, E; Martinelli, G; Silvestrini, L

1998-01-01T23:59:59.000Z

406

Searches for a heavy Higgs boson decaying into WW, ZZ in final states with hadronic jets and neutrinos  

Science Journals Connector (OSTI)

The H ? ZZ ? 2?2q decay mode has the largest branching fraction among all H?ZZ modes considered at CMS, about 20 times larger than that of the fully leptonic final state, and since all four decay products are ...

Giovanni Petrucciani

2013-01-01T23:59:59.000Z

407

USC TROJAN FAMILY MAGAZINE winter 2006 2928 USC TROJAN FAMILY MAGAZINE spring 2007 POPULAR INTRODUCTIONS to nanotechnology usually crow about the  

E-Print Network [OSTI]

INTRODUCTIONS to nanotechnology usually crow about the minuteness of it all. Nano* means small, we are told no one has ever heard of quark-based medicine or lepton therapy: nanoparticles in medicine need to hit waiting for its sage. The sage has been slow in coming. So far, nanotechnology has excelled at producing

Southern California, University of

408

Search for Heavy Majorana Neutrinos in ?[superscript ]?[superscript ] + just and e[superscript ]e[superscript ] + jets events in pp collisions at ?s = 7 TeV  

E-Print Network [OSTI]

A search is performed for heavy Majorana neutrinos (N) using an event signature defined by two same-sign charged leptons of the same flavour and two jets. The data correspond to an integrated luminosity of 4.98 fb[superscript ...

Apyan, Aram

409

Measurement of the tt-bar production cross section in pp-bar collisions at s?=1.96??TeV using secondary vertex b tagging  

E-Print Network [OSTI]

We report a new measurement of the tt-bar production cross section in pp-bar collisions at a center-of-mass energy of 1.96 TeV using events with one charged lepton (electron or muon), missing transverse energy, and jets. ...

Baringer, Philip S.; Bean, Alice; Coppage, Don; Gardner, J.; Moulik, Tania; Wilson, Graham Wallace; Abazov, V. M.; Abbott, B.; Abolins, M.; Acharya, B. S.; Adams, M.

2006-12-26T23:59:59.000Z

410

Tau decays with one charged particle plus multiple pi(0)'s  

E-Print Network [OSTI]

With the CLEO-II detector at the Cornell Electron Storage Ring, we have measured branching fractions for tau lepton decay into one-prong final states with multiple pi0's, B(hnpi)0, normalized to the branching fraction for ...

Ammar, Raymond G.; Ball, S.; Baringer, Philip S.; Coppage, Don; Copty, N.; Davis, Robin E. P.; Hancock, N.; Kelly, M.; Kwak, Nowhan; Lam, H.

1993-03-01T23:59:59.000Z

411

ETC With a GIM Mechanism  

E-Print Network [OSTI]

We construct an extended technicolor model of quarks and leptons which preserves a GIM mechanism. Furthermore, there is only a minimal technicolor sector, in accordance with recent precision measurements of electroweak parameters. We also show how to incorporate custodial SU(2) and massless neutrinos into such a model.

L. Randall

1992-10-13T23:59:59.000Z

412

Preon Prophecies by the Standard Model  

E-Print Network [OSTI]

The Standard Model of quarks and leptons is, at first sight, nothing but a set of {\\it ad hoc} rules, with no connections, and no clues to their true background. At a closer look, however, there are many inherent prophecies that point in the same direction: {\\it Compositeness} in terms of three stable preons.

Fredriksson, S

2003-01-01T23:59:59.000Z

413

Inclusive production of hadrons in $\\ell^\\uparrow p^\\uparrow \\to h^\\uparrow X$ and spin measurements  

E-Print Network [OSTI]

We discuss the production of polarized hadrons in polarized lepton nucleon interactions and show that the helicity density matrix of the hadron, when measurable, can give information on the spin structure of the nucleon and the spin dependence of the quark fragmentation process. Single spin asymmetries in the $\\ell N^\\uparrow \\to hX$ process are also briefly discussed.

Anselmino, M; Hansson, J; Murgia, F

1996-01-01T23:59:59.000Z

414

A report on high-energy physics  

Science Journals Connector (OSTI)

...their subject "high-energy particle physics," and their goal...the energy of the interacting particles (Fig. 1). There is a trend...Pauli once said, 'What God hath put asunder no man shall...12 leptons. There are the particles that carry the forces, the...

Leon M. Lederman

1982-01-01T23:59:59.000Z

415

Recent Results in Diffractive ep Scattering at HERA  

E-Print Network [OSTI]

Recent Results in Diffractive ep Scattering at HERA Introduction to diffraction in ep Exclusive Diffraction in ep Scattering Matthew Beckingham 2 Diffraction Lepton-hadron (-p) or hadron-hadron (p to interpret in (p)QCD? #12;Lake Louise 06 Diffraction in ep Scattering Matthew Beckingham 3 Diffraction

416

Spectroscopy and decays of charm and bottom  

SciTech Connect (OSTI)

After a brief review of the quark model, we discuss our present knowledge of the spectroscopy of charm and bottom mesons and baryons. We go on to review the lifetimes, semileptonic, and purely leptonic decays of these particles. We conclude with a brief discussion B and D mixing and rare decays.

Butler, J.N.

1997-10-01T23:59:59.000Z

417

Direct Detection of Warm Dark Matter in the X-ray  

E-Print Network [OSTI]

We point out a serendipitous link between warm dark matter (WDM) models for structure formation on the one hand and the high sensitivity energy range (1-10 keV) for x-ray photon detection on the Chandra and XMM-Newton observatories on the other. This fortuitous match may provide either a direct detection of the dark matter or exclusion of many candidates. We estimate expected x-ray fluxes from field galaxies and clusters of galaxies if the dark matter halos of these objects are composed of WDM candidate particles with rest masses in the structure formation-preferred range (~1 keV to ~20 keV) and with small radiative decay branches. Existing observations lead us to conclude that for singlet neutrinos (possessing a very small mixing with active neutrinos) to be a viable WDM candidate they must have rest masses < 5 keV in the zero lepton number production mode. Future deeper observations may detect or exclude the entire parameter range for the zero lepton number case, perhaps restricting the viability of singlet neutrino WDM models to those where singlet production is driven by a significant lepton number. The Constellation X project has the capability to detect/exclude singlet neutrino WDM for lepton number values up to 10% of the photon number. We also consider diffuse x-ray background constraints on these scenarios. These same x-ray observations additionally may constrain parameters of active neutrino and gravitino WDM candidates.

K. Abazajian; G. M. Fuller; W. H. Tucker

2001-05-31T23:59:59.000Z

418

Mixed sneutrinos, dark matter, and the CERN LHC  

Science Journals Connector (OSTI)

We study the phenomenology of supersymmetric models in which gauge-singlet scalars mix with the minimal supersymmetric standard model (MSSM) sneutrinos through weak-scale A terms. After reviewing the constraints on mixed-sneutrino dark matter from measurements of ?CDM and from direct-detection experiments, we explore mixed-sneutrino signatures relevant to the LHC. For a mixed-sneutrino lightest supersymmetric particle (LSP) and a right-handed slepton next-to-lightest supersymmetric particle (NLSP), decays of the lightest neturalino can produce opposite-sign, same-flavor (OSSF) dileptons with an invariant-mass distribution shifted away from the kinematic end point. This signature is possible for parameters that lead to a cosmologically viable mixed-sneutrino LSP. We also consider signatures that require larger mixing angles than preferred for mixed-sneutrino dark matter, but which are possible regardless of whether a mixed-sneutrino is the LSP. In some parameter regions, the charginos and neutralinos produced in cascades all decay dominantly to the lighter sneutrinos, leading to a kinematic edge in the jet-lepton invariant-mass distribution from the decay chain q??-q??*lq, without an OSSF dilepton signature. We explore the possibility of using mass-estimation methods to distinguish this mixed-sneutrino jet-lepton signature from an MSSM one. Finally, we consider signatures associated with Higgs-lepton or Z-lepton production in cascades involving the heavier sneutrinos.

Zachary Thomas; David Tucker-Smith; Neal Weiner

2008-06-18T23:59:59.000Z

419

MUON DECAY PARAMETERS Revised June 2011 by W. Fetscher and H.-J. Gerber (ETH  

E-Print Network [OSTI]

­ 1­ MUON DECAY PARAMETERS Revised June 2011 by W. Fetscher and H.-J. Gerber (ETH Z¨urich). Introduction: All measurements in direct muon decay, µ- e- + 2 neutrals, and its inverse, µ + e- µ- + neutral on muon decay are valid for the leptonic tau decays + + ¯e with the replacements mµ m , me m

420

Research and Development of Future Muon Collider  

SciTech Connect (OSTI)

Muon collider is a considerable candidate of the next generation high-energy lepton collider machine. A novel accelerator technology must be developed to overcome several intrinsic issues of muon acceleration. Recent research and development of critical beam elements for a muon accelerator, especially muon beam phase space ionization cooling channel, are reviewed in this paper.

Yonehara, K.; /Fermilab

2012-05-01T23:59:59.000Z

Note: This page contains sample records for the topic "leptons leptons leptons" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


421

MUON DECAY PARAMETERS Revised August 2009 by W. Fetscher and H.-J. Gerber (ETH  

E-Print Network [OSTI]

­ 1­ MUON DECAY PARAMETERS Revised August 2009 by W. Fetscher and H.-J. Gerber (ETH Z¨urich). Introduction: All measurements in direct muon decay, - e- + 2 neutrals, and its inverse, + e- - + neutral on muon decay are valid for the leptonic tau decays + + ¯e with the replacements m m , me m

422

MUON DECAY PARAMETERS Revised January 2012 by W. Fetscher and H.-J. Gerber (ETH  

E-Print Network [OSTI]

­ 1­ MUON DECAY PARAMETERS Revised January 2012 by W. Fetscher and H.-J. Gerber (ETH Z¨urich). Introduction: All measurements in direct muon decay, µ- e- + 2 neutrals, and its inverse, µ + e- µ- + neutral on muon decay are valid for the leptonic tau decays + + ¯e with the replacements mµ m , me m

423

Intense Muon Physics Working Group Summary  

E-Print Network [OSTI]

The intense muon beams which will be available at a neutrino factory provide a unique opportunity for searching for physics beyond the standard model, both in lepton flavor violation and in the search for a permanent electric dipole moment for the muon. Other experiments which can use intense muon beams will also be possible.

B. Lee Roberts; Marco Grassi; Akira Sato

2005-10-20T23:59:59.000Z

424

Measurements of Form Factors with the BaBar Experiment  

SciTech Connect (OSTI)

Selected recent results on measurements of form factors by the BaBar Collaboration are reviewed, including e{sup +}e{sup -} {yields} {eta}{prime}{gamma}, leptonic and semileptonic charm decays from data collected at or near the {Upsilon}(4S) resonance.

Li, Selina Z.; /SLAC

2011-08-25T23:59:59.000Z

425

Simple neutrino mass matrix with only two free parameters  

E-Print Network [OSTI]

A simple form of neutrino mass matrix which has only two free parameters is proposed from a phenomenological point of view. Using this mass matrix, we succeed to reproduce all the observed values for the MNS lepton mixing angles and the neutrino mass squared difference ratio. Our model also predicts $\\delta_{\

Hiroyuki Nishiura; Takeshi Fukuyama

2014-05-10T23:59:59.000Z

426

The Muon to Electron Conversion Experiment at Fermilab  

E-Print Network [OSTI]

2e The Future: Project X and Mu2e Outline #12;nucleus n ·p n ·p Electron Quark higher beam particle of matter The Frontiers The Intensity Frontier and Precision Measurements Charged Lepton Flavor Violation Mu energy = smaller size you can see 0.000000000000000001 m nano nano meter Everything that we can see

Dai, Pengcheng

427

Fermilab Wine and Cheese, May 13th , 2005 p. 1 Search for Massive ResonancesGregory Veramendi  

E-Print Network [OSTI]

Fermilab Wine and Cheese, May 13th , 2005 p. 1 CDF Search for Massive ResonancesGregory Veramendi of Illinois, Urbana-Champaign) for the CDF collaboration #12;Fermilab Wine and Cheese, May 13th , 2005 p. 2 decaying to leptons and photons provides very clean signature even in a hadron collider #12;Fermilab Wine

Fermilab

428

Electroweak physics at LHCb  

E-Print Network [OSTI]

Measurements of electroweak boson production provide an important test of the Standard Model at the LHC energies and allow the partonic content of the proton to be constrained. $W$ and $Z$ bosons are reconstructed in several leptonic final states using data samples corresponding to an integrated luminosity of up to about 1 $fb^{-1}$. Inclusive and associated production cross-sections are reported.

Bifani, Simone

2014-01-01T23:59:59.000Z

429

Electroweak Physics at LHCb  

E-Print Network [OSTI]

Measurements of electroweak boson production provide an important test of the Standard Model at the LHC energies and allow the partonic content of the proton to be constrained. $W$ and $Z$ bosons are reconstructed in several leptonic final states using data samples corresponding to an integrated luminosity of up to about 1 $fb^{-1}$. Inclusive and associated production cross-sections are reported.

Bifani, S

2014-01-01T23:59:59.000Z

430

Electroweak physics at LHCb  

E-Print Network [OSTI]

Measurements of electroweak boson production provide an important test of the Standard Model at the LHC energies and allow the partonic content of the proton to be constrained. $W$ and $Z$ bosons are reconstructed in several leptonic final states using data samples corresponding to an integrated luminosity of up to about 1 $fb^{-1}$. Inclusive and associated production cross-sections are reported.

Simone Bifani

2014-08-06T23:59:59.000Z

431

Higgs self coupling measurement in e+e- collisions at center-of-mass energy of 500 GeV  

E-Print Network [OSTI]

Feasibility of the measurement of the trilinear self-couplings of the Higgs boson is studied. Such a measurement would experimentally determine the structure of the Higgs potential. Full hadronic and semi-leptonic final states of the double-Higgs strahlung have been investigated.

C. Castanier; P. Gay; P. Lutz; J. Orloff

2001-01-18T23:59:59.000Z

432

Top quark mass measurement using the template method at CDF  

DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

We present a measurement of the top quark mass in the lepton+jets and dilepton channels of tt? decays using the template method. The data sample corresponds to an integrated luminosity of 5.6 fb-1 of pp? collisions at Tevatron with ?s = 1.96 TeV, collected with the CDF II detector. The measurement is performed by constructing templates of three kinematic variables in the lepton+jets and two kinematic variables in the dilepton channel. The variables are two reconstructed top quark masses from different jets-to-quarks combinations and the invariant mass of two jets from the W decay in the lepton+jets channel, and a reconstructed top quark mass and mT2, a variable related to the transverse mass in events with two missing particles, in the dilepton channel. The simultaneous fit of the templates from signal and background events in the lepton+jets and dilepton channels to the data yields a measured top quark mass of Mtop = 172.11.1 (stat)0.9 (syst) GeV/c2.

Aaltonen, T [Helsinki Inst. of Phys.; Alvarez Gonzalez, B [Oviedo U.; Cantabria Inst. of Phys.; Amerio, S [INFN, Padua; Amidei, D [Michigan U.; Anastassov, A [Northwestern U.; Annovi, A [Frascati; Antos, J [Comenius U.; Apollinari, G [Fermilab; Appel, J A [Fermilab; Apresyan, A [Purdue U.; Arisawa, T [Waseda U.; Dubna, JINR

2011-06-03T23:59:59.000Z

433

New physics motivated by the low energy approach to electric charge quantization  

E-Print Network [OSTI]

The low-energy approach to electric charge quantization predicts physics beyond the minimal standard model. A model-independent approach via effective Lagrangians is used examine the possible new physics, which may manifest itself indirectly through family-lepton--number violating rare decays.

H. Lew; R. R. Volkas

1994-10-13T23:59:59.000Z

434

APS_april_mtg_2014  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

conservation. &23; 10 C R O S S - S E C T I O N O N E - B O D Y C U R R E N T elementary process of each isolated nucleon beam particles + outgoing leptons Chun-Min (Mindy) Jen,...

435

Leading-order hadronic contributions to the electron and tau anomalous magnetic moments  

E-Print Network [OSTI]

The leading hadronic contributions to the anomalous magnetic moments of the electron and the $\\tau$-lepton are determined by a four-flavour lattice QCD computation with twisted mass fermions. The continuum limit is taken and systematic uncertainties are quantified. Full agreement with results obtained by phenomenological analyses is found.

Burger, Florian; Jansen, Karl; Petschlies, Marcus

2015-01-01T23:59:59.000Z

436

LCPHSM2004005 Study of Higgs Boson Pair Production at  

E-Print Network [OSTI]

LC­PHSM­2004­005 March 2004 Study of Higgs Boson Pair Production at Linear Collider K. Desch a , TV for the measurement of the neutral Higgs boson properties within the framework of the MSSM. The process of associated Higgs boson production with subsequent decays of Higgs bosons into b­quark and #­lepton pairs

437

From the Big Bang to the Higgs Boson in Less Than an Hour  

E-Print Network [OSTI]

From the Big Bang to the Higgs Boson in Less Than an Hour Jeffrey D neutrino Z0 W + W -g gluon (8) photon Z boson W bosons Quarks Leptons H Higgs boson Gauge bosons (force field quanta) Higgs boson and vacuum expectation value Strong force EM force Weak force #12;Par7cles

Fygenson, Deborah Kuchnir

438

Search for a Low-Mass Standard Model Higgs Boson in the ?? Decay Channel in pp? Collisions at ?s=1.96??TeV  

E-Print Network [OSTI]

We report on a search for the standard model Higgs boson decaying into pairs of ? leptons in pp? collisions produced by the Tevatron at ?s=1.96??TeV. The analyzed data sample was recorded by the CDFII detector and corresponds ...

Bauer, Gerry P.

439

Search for the Standard Model Higgs boson decaying to two W bosons at CMS  

E-Print Network [OSTI]

In this thesis, we search for the production of the Standard Model Higgs boson at the Large Hadron Collider, through its decay mode to two W bosons, which each in turn decay into a charged lepton and a neutrino. The Higgs ...

Xie, Si, Ph. D. Massachusetts Institute of Technology

2012-01-01T23:59:59.000Z

440

Search for the Standard Model Higgs Boson in the Decay Channel H?ZZ?4l in pp Collisions at sqrt[s]=7??TeV  

SciTech Connect (OSTI)

A search for a Higgs boson in the four-lepton decay channel H to ZZ, with each Z boson decaying to an electron or muon pair, is reported. The search covers Higgs boson mass hypotheses in the range 110 < mH < 600 GeV. The analysis uses data corresponding to an integrated luminosity of 4.7 inverse femtobarns recorded by the CMS detector in pp collisions at sqrt(s) = 7 TeV from the LHC. Seventy-two events are observed with four-lepton invariant mass m[4 leptons] > 100 GeV (with thirteen below 160 GeV), while 67.1 +/- 6.0 (9.5 +/-1.3) events are expected from background. The four-lepton mass distribution is consistent with the expectation of standard model background production of ZZ pairs. Upper limits at 95% confidence level exclude the standard model Higgs boson in the ranges 134-158 GeV, 180-305 GeV, and 340 -465 GeV. Small excesses of events are observed around masses of 119, 126, and 320 GeV, making the observed limits weaker than expected in the absence of a signal.

Chatrchyan, Serguei; et al.

2012-03-01T23:59:59.000Z

Note: This page contains sample records for the topic "leptons leptons leptons" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


441

Study of tau decays to four-hadron final states with kaons  

E-Print Network [OSTI]

The rare tau lepton decays to four explicitly identified hadrons have been studied with the CLEO detector at the Cornell Electron Storage Ring using (7.56 +/- 0.15) fb(-1) of data collected near root s=10.58 GeV. The first statistically significant...

Besson, David Zeke

2005-06-01T23:59:59.000Z

442

A STAGED MUON-BASED FACILITY TO ENABLE INTENSITY AND ENERGY FRONTIER SCIENCE IN THE US*  

E-Print Network [OSTI]

A STAGED MUON-BASED FACILITY TO ENABLE INTENSITY AND ENERGY FRONTIER SCIENCE IN THE US* Jean. It requires facilities at both high energy and high intensity frontiers. Neutrino oscillations are irrefutable precision flavour physics at the high intensity frontier. At the high energy frontier, a multi-TeV lepton

McDonald, Kirk

443

Limit on the electric charge-nonconserving $?^+ \\to invisible$ decay  

E-Print Network [OSTI]

The first limit on the branching ratio of the electric charge-nonconserving invisible muon decay $Br(\\mu^+ \\to invisible) invisible$ decay rate are discussed. These leptonic charge-nonconserving processes may hold in four-dimensional world in models with infinite extra dimensions, thus making their searches complementary to collider experiments probing new physics.

S. N. Gninenko

2007-07-24T23:59:59.000Z

444

Magnetic field amplification and magnetically supported explosions of collapsing, non-rotating stellar cores  

Science Journals Connector (OSTI)

......2004), multidimensional, energy-dependent flux-limited diffusion...employ a new multidimensional and energy-dependent scheme for the neutrino...two-moment solver for the neutrino energy (lepton number) and momentum...Pons, Ibanez Miralles 2000; Audit et-al. 2002). Two-moment......

M. Obergaulinger; H.-Th. Janka; M. A. Aloy

2014-01-01T23:59:59.000Z

445

Study of Michel spectrum of tau decay  

E-Print Network [OSTI]

This thesis is the beginning of a larger project to use BaBar to examine weak couplings through leptonic [tau] decay. I will use the ratio of Br... and Br... and the Michel parameters [rho] and [eta]. which describe the ...

Ackerman, Nicole (Nicole L.)

2007-01-01T23:59:59.000Z

446

The anatomy of electroweak symmetry breaking Tome II: The Higgs bosons in the Minimal Supersymmetric Model  

Science Journals Connector (OSTI)

The second part of this review is devoted to the Higgs sector of the Minimal Supersymmetric Standard Model. The properties of the neutral and charged Higgs bosons of the extended Higgs sector are summarized and their decay modes and production mechanisms at hadron colliders and at future lepton colliders are discussed.

Abdelhak Djouadi

2008-01-01T23:59:59.000Z

447

Decays of intermediate vector bosons, radiative corrections and QCD jets  

Science Journals Connector (OSTI)

We investigate decay properties of the intermediate vector bosons W and Z0. QED and QCD radiative corrections to leptonic and hadronic decay modes are calculated. Implications of the results for decay widths, branching ratios, determination of the number of neutrino species, e-?-? universality and properties of hadronic jets produced in W and Z0 decays are examined.

David Albert; William J. Marciano; Daniel Wyler; Zohreh Parsa

1980-01-01T23:59:59.000Z

448

Determinations of the QCD strong coupling ?s and the scale ?QCD  

Science Journals Connector (OSTI)

We review determinations, via experiment, of the strong coupling of QCD, ?s. In almost every case we use the results of perturbative QCD to make the necessary extraction from data. These include scaling violations of deep inelastic scattering, e+e- annihilation experiments (including quarkonium decays) and lepton pair production. Finally estimates for ? from lattice calculations are listed.

D.W. Duke; R.G. Roberts

1985-01-01T23:59:59.000Z

449

Review of Particle Properties Particle Data Group  

Science Journals Connector (OSTI)

This review of the properties of leptons, mesons, and baryons is an updating of Review of Particle Properties, Particle Data Group (Phys. Letters 39B, No. 1 (1972)). Data are evaluated, listed, averaged, and summarized in tables. A data booklet is also available.

THOMAS A. LASINSKI; ANGELA BARBARO-GALTIERI; ROBERT L. KELLY; ALAN RITTENBERG; ARTHUR H. ROSENFELD; THOMAS G. TRIPPE; NAOMI BARASH-SCHMIDT; CLAUDE BRICMAN; VLADIMIR CHALOUPKA; PAUL SDING; MATTS ROOS

1973-04-01T23:59:59.000Z

450

Impact of gamma-V vertex corrections on the V-P-gamma transition form factors  

E-Print Network [OSTI]

The aim of this paper is to present an effective field theory description of the conversion transition of the vector meson V into the pseudoscalar P and the lepton-pair l+l-. The normalized form factor for omega to pi^0 gamma^ast transition is presented and compared to the available data and to the predictions of other models.

Sergii Raspopov

2014-02-06T23:59:59.000Z

451

Generation of Small Neutrino Majorana Masses in a Randall-Sundrum Model  

E-Print Network [OSTI]

We propose a model, in the framework of 5D with warped geometry, in which small neutrino Majorana masses are generated by tree level coupling of lepton doublets to a SU(2)_{L}-triplet scalar field, which is coupled to a bulk SM-singlet. The neutrino mass scale is determined by the bulk mass term (alpha_{S}) of the singlet as ve^{-2(alpha_{S}-1)*pi*kR}. This suppression is due to a small overlap between the profile of the singlet zero mode and the triplet, which is confined to the TeV brane. The generic form for the neutrino mass matrix due to the overlap between the fermions is not compatible with the LMA solution. This is overcome by imposing a Z_{4} symmetry, which is softly broken by couplings of the triplet Higgs to the lepton doublets. This model successfully reproduces the observed masses and mixing angles in charged lepton sector as well as in the neutrino sector, in addition to having a prediction of |U_{e3}| ~ O(0.01). The mass of the triplet is of the order of a TeV, and could be produced at upcoming collider experiments. The doubly charged member of the triplet can decay into two same sign charged leptons yielding the whole triplet coupling matrix which, in turn, gives the mixing matrix in the neutrino sector.

Mu-Chun Chen

2005-04-18T23:59:59.000Z

452

Search for invisible decays of Higgs bosons in the vector boson fusion and associated ZH production modes  

E-Print Network [OSTI]

A search for invisible decays of Higgs bosons is performed using the vector boson fusion and associated ZH production modes. In the ZH mode, the Z boson is required to decay to a pair of charged leptons or a b[bar over b] ...

Apyan, Aram

453

Search for baryon number violation in top-quark decays  

E-Print Network [OSTI]

A search for baryon number violation (BNV) in top-quark decays is performed using pp collisions produced by the LHC at [sqrt s]=8 TeV. The top-quark decay considered in this search results in one light lepton (muon or ...

CMS Collaboration

454

Search for new physics in events with same-sign dileptons and jets in pp collisions at ?s = 8 TeV  

E-Print Network [OSTI]

A search for new physics is performed based on events with jets and a pair of isolated, same-sign leptons. The results are obtained using a sample of proton-proton collision data collected by the CMS experiment at a ...

Apyan, Aram

455

Search for neutrinoless ? decays: ??e? and ????  

E-Print Network [OSTI]

A search for the lepton-family-number-violating decays ??e? and ???? has been performed using CLEO II data. No evidence of a signal has been found and the corresponding upper limits are B(??e?)<2.710(-6) and B(????)<3.010(-6) at 90% C.L....

Baringer, Philip S.

1997-04-01T23:59:59.000Z

456

Geosci. Instrum. Method. Data Syst., 2, 5560, 2013 www.geosci-instrum-method-data-syst.net/2/55/2013/  

E-Print Network [OSTI]

at the flank of the Puy de D^ome using glass resistive plate chambers (GRPCs) developed for particle physics, within the CALICE collaboration. 1 Introduction Muons are leptonic elementary particles analogous, particularly when combined with other techniques used in volcanology, such as seismic, electrical

Paris-Sud XI, Université de

457

Search for Higgs Boson Production in Dilepton and Missing Energy Final States with 5.4??fb(?1) of pp-bar Collisions at s?=1.96??TeV  

E-Print Network [OSTI]

A search for the standard model Higgs boson is presented using events with two charged leptons and large missing transverse energy selected from 5.4??fb(?1) of integrated luminosity in pp-bar collisions at s?=1.96??TeV collected with the D0 detector...

Baringer, Philip S.; Bean, Alice; Clutter, Justace Randall; McGivern, Carrie Lynne; Moulik, Tania; Sekaric, Jadranka; Wilson, Graham Wallace; Abazov, V. M.; Abbott, B.; Abolins, M.; Acharya, B. S.; Adams, M.; Adams, T.

2010-02-12T23:59:59.000Z

458

Double beta decay, Majorana neutrinos, and neutrino mass Frank T. Avignone III*  

E-Print Network [OSTI]

The theoretical and experimental issues relevant to neutrinoless double beta decay are reviewed. The impact more sensitive, even the nonobservation of neutrinoless double beta decay will be useful Acknowledgments 513 References 514 I. INTRODUCTION Neutrinoless double beta decay 0 is a very slow lepton

Engel, Jonathan

459

A Search for Neutrinoless Double-beta Decay of Germanium-76 J.F. Wilkerson1, 2, 3  

E-Print Network [OSTI]

A Search for Neutrinoless Double-beta Decay of Germanium-76 J.F. Wilkerson1, 2, 3 and S.R. Elliott4, The Majorana collaboration[1] is searching for neutrinoless double beta decay using 76 Ge, which has previously of neutrinoless double-beta decay would show that lepton number is violated, neutrinos are Majorana particles

460

Simple neutrino mass matrix with only two free parameters  

E-Print Network [OSTI]

A simple form of neutrino mass matrix which has only two free parameters is proposed from a phenomenological point of view. Using this mass matrix, we succeed to reproduce all the observed values for the MNS lepton mixing angles and the neutrino mass squared difference ratio. Our model also predicts $\\delta_{\

Nishiura, Hiroyuki

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "leptons leptons leptons" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


461

Parton Distributions and LHC data  

E-Print Network [OSTI]

In this contribution we briefly report on the progress and open problems in parton distribution functions (PDFs), with emphasis on their implications for LHC phenomenology. Then we study the impact of the recent ATLAS and CMS W lepton asymmetry data on the NNPDF2.1 parton distributions. We show that these data provide the first constrains on PDFs from LHC measurements.

Juan Rojo

2011-06-10T23:59:59.000Z

462

Exploiting Third Generation Quarks for New Physics Discoveries at the Energy Frontier  

SciTech Connect (OSTI)

The K-State group's effort is top quark physics and searches for beyond-standard-model physics in t{anti #22;}t final states. The KSU team performed the most precise measurement of the t#22;{anti t} cross section in the lepton + jets channel, and for the first time excluded the fourth generation of the standard model in the perturbative regime.

Ivanov, Andrew G. [KSU] (ORCID:0000000292705643)

2013-10-15T23:59:59.000Z

463

Overcoming a critical background to Higgs-boson detection  

Science Journals Connector (OSTI)

We show that it may well be possible to overcome the jjW background to Higgs-boson detection in mixed hadronic-leptonic final decay channels, while maintaining substantial event rates, even for Higgs-boson masses as high as 1 TeV.

J. F. Gunion and M. Soldate

1986-08-01T23:59:59.000Z

464

Z:\Professor Perl\Tau Discovery\Floppy THREE\SLAC-PUB-10150.prn.pdf  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

0150 0150 October 2003 Submitted to Physics in Perspective *Work supported by Department of Energy contract DE-AC03-76SF00515. Tau Discovery THE DISCOVERY OF THE TAU LEPTON AND THE CHANGES IN ELEMENTARY PARTICLE PHYSICS IN 40 YEARS Martin L. Perl Stanford Linear Accelerator Center and Stanford University, Stanford, CA 94309 Phone: 650-926-4286 Fax: 650-926-4001 Email: martin@slac.stanford.edu Introduction This is a history of my discovery of the tau lepton in the 1970s for which I was awarded the Nobel Prize in Physics. I have previously described some aspects of the discovery. In 1996 in my collection of papers entitled, "Reflections on Experimental Science," 1 I gave a straightforward account of the experimental method and the physics involved in the

465

Probing WWgamma coupling through e gamma --> nu W at ILC  

E-Print Network [OSTI]

The anomalous WWgamma coupling is probed through e gamma--> nu W at the ILC. With a spectacular single lepton final state, this process is well suited to study the above coupling. Within the narrow-width approximation, a semi-analytical study of the secondary lepton energy-angle double distribution is performed. Cross section measurements can probe delta-kappa-gamma to about +/- 0.004 for a luminosity of 100 /fb at 500 GeV center of mass energy with unpolarised electron beam. The limits derivable on lambda-gamma are comparatively more relaxed. These limits can be improved significantly by considering the angle and energy distributions of the final state muon. More importantly, the angular distributions at fixed energy values, and energy distribution at fixed angles present very interesting possibility of distinguishing the case of lambda-gamma=0, lambda-gamma 0.

Kumar, Satendra

2015-01-01T23:59:59.000Z

466

QED Corrections to Hadronic Processes in Lattice QCD  

E-Print Network [OSTI]

In this paper, for the first time a method is proposed to compute electromagnetic effects in hadronic processes using lattice simulations. The method can be applied, for example, to the leptonic and semileptonic decays of light or heavy pseudoscalar mesons. For these quantities the presence of infrared divergences in intermediate stages of the calculation makes the procedure much more complicated than is the case for the hadronic spectrum, for which calculations already exist. In order to compute the physical widths, diagrams with virtual photons must be combined with those corresponding to the emission of real photons. Only in this way do the infrared divergences cancel as first understood by Bloch and Nordsieck in 1937. We present a detailed analysis of the method for the leptonic decays of a pseudoscalar meson. The implementation of our method, although challenging, is within reach of the present lattice technology.

Carrasco, N; Martinelli, G; Sachrajda, C T; Tantalo, N; Tarantino, C; Testa, M

2015-01-01T23:59:59.000Z

467

CP violations in ? meson decay  

Science Journals Connector (OSTI)

We study the pion decays with intermediate on-shell neutrinos N into two electrons and a muon, ? ? eN ? ee??. We investigate the branching ratios Br = [?(?? ? e?e??+?) ?(?+ ? e+e+???)]/?(?? ? all) and the CP asymmetry ratio for such decays, in the scenario with two different on-shell neutrinos. If N is Dirac, only the lepton number conserving (LC) decays contribute (LC: ? = ?e or ); if N is Majorana, both LC and lepton number violating (LV) decays contribute (LV: or ? = ??). The results show that the CP asymmetry is in general very small, but increases and becomes ~1 when the masses of the two intermediate neutrinos get closer to each other, i.e., when their mass difference becomes comparable with their decay width, . The observation of CP violation in pion decays would be consistent with the existence of the well-motivated ?MSM model with two almost degenerate heavy neutrinos.

Gorazd Cveti?; C S Kim; Jilberto Zamora-Sa

2014-01-01T23:59:59.000Z

468

FEASIBILITY STUDY II OF A MUON BASED NEUTRINO SOURCE.  

SciTech Connect (OSTI)

The concept of using a muon storage ring to provide a well characterized beam of muon and electron neutrinos (a Neutrino Factory) has been under study for a number of years now at various laboratories throughout the world. The physics program of a Neutrino Factoryis focused on the relatively unexplored neutrino sector. In conjunction with a detector located a suitable distance from the neutrino source, the facility would make valuable contributions to the study of neutrino masses and lepton mixing. A Neutrino Factory is expected to improve the measurement accuracy of sin{sup 2}(2{theta}{sub 23}) and {Delta}m{sup 2}{sub 32} and provide measurements of sin{sup 2}(2{theta}{sub 13}) and the sign of {Delta}m{sup 2}{sub 32}. It may also be able to measure CP violation in the lepton sector.

GALLARDO,J.C.; OZAKI,S.; PALMER,R.B.; ZISMAN,M.

2001-06-30T23:59:59.000Z

469

A search for resonant production of tt? pairs in 4.8 fb-1 of integrated luminosity of pp? collisions at ?s=1.96 TeV  

DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

We search for resonant production of tt? pairs in 4.8 fb-1 integrated luminosity of pp? collision data at ?s = 1.96 TeV in the lepton+jets decay channel, where one top quark decays leptonically and the other hadronically. A matrix element reconstruction technique is used; for each event a probability density function (pdf) of the tt? candidate invariant mass is sampled. These pdfs are used to construct a likelihood function, whereby the cross section for resonant tt? production is estimated, given a hypothetical resonance mass and width. The data indicate no evidence of resonant production of tt? pairs. A benchmark model of leptophobic Z' ? tt? is excluded with mZ' < 900 GeV at 95% confidence level.

Aaltonen, T [Helsinki Inst. of Phys.; Alvarez Gonzalez, B [Oviedo U.; Cantabria Inst. of Phys.; Amerio, S [INFN, Padua; Amidei, D [Michigan U.; Anastassov, A [Northwestern U.; Annovi, A [Frascati; Antos, J [Comenius U.; Apollinari, G [Fermilab; Appel, J A [Fermilab; Apresyan, A [Purdue U.; Arisawa, T [Waseda U.; Dubna, JINR

2011-10-27T23:59:59.000Z

470

Top mass measurements at the Tevatron run II  

SciTech Connect (OSTI)

The latest top quark mass measurements by the CDF and D0 experiments are presented here. The mass has been determined in the dilepton (t{bar t} {yields} e{mu}, ee, {mu}{mu} + jets + E{sub T}) and lepton plus jets (t{bar t} {yields} e or {mu} + jets + E{sub T}) final states. The most accurate single result from lepton plus jets channel is 173.5{sub -3.6}{sup +3.7}(stat. + Jet Energy Scale Systematic) {+-} 1.3(syst.) GeV/c{sup 2}, which is better than the combined CDF and D0 Run I average. A preliminary and unofficial average of the best experimental Run II results gives M{sub top} = 172.7 {+-} 3.5 GeV/c{sup 2}.

Velev, Gueorgui V.; /Fermilab

2005-10-01T23:59:59.000Z

471

Patterns of flavor signals in supersymmetric models  

SciTech Connect (OSTI)

Quark and lepton flavor signals are studied in four supersymmetric models, namely, the minimal supergravity model, the minimal supersymmetric standard model with right-handed neutrinos, SU(5) supersymmetric grand unified theory with right-handed neutrinos, and the minimal supersymmetric standard model with U(2) flavor symmetry. We calculate b{yields}s(d) transition observables in B{sub d} and B{sub s} decays, taking the constraint from the B{sub s}-B{sub s} mixing recently observed at the Tevatron into account. We also calculate lepton flavor violating processes {mu}{yields}e{gamma}, {tau}{yields}{mu}{gamma}, and {tau}{yields}e{gamma} for the models with right-handed neutrinos. We investigate possibilities to distinguish the flavor structure of the supersymmetry breaking sector with use of patterns of various flavor signals which are expected to be measured in experiments such as MEG, LHCb, and a future Super B factory.

Goto, Toru [Theory Group, KEK, Tsukuba, Ibaraki 305-0801 (Japan); YITP, Kyoto University, Kyoto 606-8502 (Japan); Okada, Yasuhiro [Theory Group, KEK, Tsukuba, Ibaraki 305-0801 (Japan); Department of Particle and Nuclear Physics, The Graduate University for Advanced Studies (Sokendai), Tsukuba, Ibaraki 305-0801 (Japan); Shindou, Tetsuo [DESY Theory Group, Notkestrasse 85, D22607 Hamburg (Germany); SISSA/ISAS, via Beirut 2-4, I-34014 Trieste (Italy); Tanaka, Minoru [Department of Physics, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043 (Japan)

2008-05-01T23:59:59.000Z

472

Footprints of SUSY GUTs in Flavour Physics  

E-Print Network [OSTI]

Supersymmetric (SUSY) Grand Unified theories (GUTs) generally predict FCNC and CP violating processes to occur both in the leptonic and hadronic sectors. Assuming an underlying SU(5) group plus right-handed neutrinos (RN), we perform an extensive study of FCNC and CP violation, analyzing the correlations between leptonic and hadronic processes like mu-> e gamma and K-Kbar mixing, tau->mu gamma and b -> s transitions such as B_d -> phi K_s and Bs-Bsbar mixing. Moreover, we examine the impact of the considered scenario on the UT analyses, monitoring the low energy consequences implied by possible solutions to the various tensions in the present UT analyses. We compare the phenomenological implications of this NP scenario with the ones of supersymmetric flavour models finding a few striking differences that could allow to distinguish these different NP models.

Andrzej J. Buras; Minoru Nagai; Paride Paradisi

2010-11-22T23:59:59.000Z

473

Patterns of flavor signals in supersymmetric models  

E-Print Network [OSTI]

Quark and lepton flavor signals are studied in four supersymmetric models, namely the minimal supergravity model, the minimal supersymmetric standard model with right-handed neutrinos, SU(5) supersymmetric grand unified theory with right-handed neutrinos and the minimal supersymmetric standard model with U(2) flavor symmetry. We calculate b --> s(d) transition observables in B_d and B_s decays, taking the constraint from the B_s--B_s-bar mixing recently observed at Tevatron into account. We also calculate lepton flavor violating processes mu --> e gamma, tau --> mu gamma and tau --> e gamma for the models with right-handed neutrinos. We investigate possibilities to distinguish the flavor structure of the supersymmetry breaking sector with use of patterns of various flavor signals which are expected to be measured in experiments such as MEG, LHCb and a future Super B Factory.

Toru Goto; Yasuhiro Okada; Tetsuo Shindou; Minoru Tanaka

2007-11-19T23:59:59.000Z

474

Invariant-mass distribution of jet pairs produced in association with a $W$ boson in \\ppbar collisions at $\\sqrt{s}=1.96$ TeV using the full CDF Run II data set  

E-Print Network [OSTI]

We report on a study of the dijet invariant-mass distribution in events with one identified lepton, a significant imbalance in the total event transverse momentum, and two jets. This distribution is sensitive to the possible production of a new particle in association with a $W$ boson, where the boson decays leptonically. We use the full data set of proton-antiproton collisions at 1.96 TeV center-of-mass energy collected by the Collider Detector at the Fermilab Tevatron and corresponding to an integrated luminosity of 8.9 fb$^{-1}$. The data are found to be consistent with standard-model expectations, and a 95$\\%$ confidence level upper limit is set on the cross section for a $W$ boson produced in association with a new particle decaying into two jets.

T. Aaltonen

2014-02-27T23:59:59.000Z

475

Precision test of the SM with Kl2 and Kl3 decays at KLOE  

E-Print Network [OSTI]

Kaon decay studies seeking new-physics (NP) effects in leptonic (K_l2) or semileptonic (K_l3) decays are discussed. A unitarity test of the first row of the CKM mixing matrix is obtained from the KLOE precision measurements of Kl3 widths for K^+-, K_L, and (unique to KLOE) K_S, complemented with the absolute branching ratio for the K_mu2 decay. KLOE results lead to constraints for NP models and can probe possible charged Higgs exchange contribution in SM extensions with two Higgs doublets. The main focus in the present document is set on a new measurement of R_K=Gamma(K_e2)/Gamma(K_mu2) with an accuracy at the % level, aiming at finding evidence of deviations from the SM prediction induced by lepton-flavor violation NP effects.

T. Spadaro

2009-07-15T23:59:59.000Z

476

THE ROLE OF STOCHASTIC ACCELERATION IN THE PROMPT EMISSION OF GAMMA-RAY BURSTS: APPLICATION TO HADRONIC INJECTION  

SciTech Connect (OSTI)

We study effects of particle re-acceleration (or heating) in the post-shock region via magnetohydrodynamic/plasma turbulence, in the context of a mixed hadronic-leptonic model for the prompt emission of gamma-ray bursts, using both analytical and numerical methods. We show that stochastically accelerated (or heated) leptons, which are injected via pp and p{gamma} reactions and subsequent pair cascades, are plausibly able to reproduce the Band function spectra with {alpha} {approx} 1 and {beta} {approx} 2-3 in the {approx}MeV range. An additional hard component coming from the proton-induced cascade emission is simultaneously expected, which can be compatible with observed extra power-law spectra far above the MeV range. We also discuss the specific implications of hadronic models for ongoing high-energy neutrino observations.

Murase, Kohta [Department of Physics, Center for Cosmology and AstroParticle Physics, Ohio State University, 191 West Woodruff Avenue, Columbus, OH 43210 (United States); Asano, Katsuaki; Terasawa, Toshio [Department of Physics, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550 (Japan); Meszaros, Peter [Department of Astronomy and Astrophysics, Center for Particle Astrophysics, Pennsylvania State University, University Park, PA 16802 (United States)

2012-02-20T23:59:59.000Z

477

Search for the Standard Model Higgs boson production in association with top quarks in pp collisions at 8 TeV with the ATLAS detector  

E-Print Network [OSTI]

The search for the production of the Higgs boson associated with a pair of top quarks in the ATLAS experiment is presented. It focuses on Higgs bosons decaying to $b\\bar{b}$ and events containing two leptons (electrons and/or muons). It uses 20.3 fb$^{-1}$ of $pp$ collision data at $\\sqrt{s}$ = 8 TeV collected with the ATLAS detector at the LHC in 2012. No significant excess of events is found and the 95% CL observed (expected) limit is 7.0xSM (4.3xSM). After combining with the single lepton final state an observed (expected) limit of 4.1xSM (2.6xSM) with a best fit of $\\mu=1.7\\pm1.4$ is obtained.

Moreno Llacer, Maria

2014-01-01T23:59:59.000Z

478

W{gamma} Production and Limits on Anomalous WW{gamma} Couplings in pp Collisions at {radical}(s)=1.96 TeV  

SciTech Connect (OSTI)

We measure the cross section and the difference in rapidities between photons and charged leptons for inclusive W({yields}l{nu})+{gamma} production in e{gamma} and {mu}{gamma} final states. Using data corresponding to an integrated luminosity of 4.2 fb{sup -1} collected with the D0 detector at the Fermilab Tevatron Collider, the measured cross section times branching fraction for the process pp{yields}W{gamma}+X{yields}l{nu}{gamma}+X and the distribution of the charge-signed photon-lepton rapidity difference are found to be in agreement with the standard model. These results provide the most stringent limits on anomalous WW{gamma} couplings for data from hadron colliders: -0.4<{Delta}{kappa}{sub {gamma}<}0.4 and -0.08<{lambda}{sub {gamma}<}0.07 at the 95% C.L.

Abazov, V. M.; Alexeev, G. D.; Golovanov, G.; Kharzheev, Y. N.; Malyshev, V. L.; Tokmenin, V. V.; Vertogradov, L. S.; Yatsunenko, Y. A. [Joint Institute for Nuclear Research, Dubna (Russian Federation); Abbott, B.; Gutierrez, P.; Jayasinghe, A.; Severini, H.; Skubic, P.; Strauss, M.; Svoisky, P. [University of Oklahoma, Norman, Oklahoma 73019 (United States); Acharya, B. S.; Banerjee, S.; Mondal, N. K. [Tata Institute of Fundamental Research, Mumbai (India); Adams, M.; Bazterra, V. [University of Illinois at Chicago, Chicago, Illinois 60607 (United States)

2011-12-09T23:59:59.000Z

479

Forward-backward asymmetry in top quark-antiquark production  

SciTech Connect (OSTI)

We present a measurement of forward-backward asymmetry in top quark-antiquark production in proton-antiproton collisions in the final state containing a lepton and at least four jets. Using a dataset corresponding to an integrated luminosity of 5.4 fb-1, collected by the D0 experiment at the Fermilab Tevatron Collider, we measure the t{bar t} forward-backward asymmetry to be (9.2 3.7)% at the reconstruction level. When corrected for detector acceptance and resolution, the asymmetry is found to be (19.6 6.5)%. We also measure a corrected asymmetry based on the lepton from a top quark decay, found to be (15.2 4.0)%. The results are compared to predictions based on the next-to-leading-order QCD generator mc@nlo. The sensitivity of the measured and predicted asymmetries to the modeling of gluon radiation is discussed.

Abazov, Victor Mukhamedovich [Dubna, JINR; Abbott, Braden Keim [Oklahoma U.; Acharya, Bannanje Sripath [Tata Inst.; Adams, Mark Raymond [Illinois U., Chicago; Adams, Todd [Florida State U.; Alexeev, Guennadi D [Dubna, JINR; Alkhazov, Georgiy D [St. Petersburg, INP; Alton, Andrew K [Michigan U.; Augustana Coll., Sioux Falls; Alverson, George O [Northeastern U.; Alves, Gilvan Augusto [Rio de Janeiro, CBPF; Aoki, Masato [Fermilab; Louisiana Tech. U.

2011-12-12T23:59:59.000Z

480

Search for a Vectorlike Quark with Charge 2/3 in t+Z Events from pp Collisions at sqrt[s]=7??TeV  

SciTech Connect (OSTI)

A search for pair-produced heavy vector-like charge-2/3 quarks, T, in pp collisions at a center-of-mass energy of 7 TeV, is performed with the CMS detector at the LHC. Events consistent with the flavor-changing-neutral-current decay of a T quark to a top quark and a Z boson are selected by requiring two leptons from the Z-boson decay, as well as an additional isolated charged lepton. In a data sample corresponding to an integrated luminosity of 1.14 inverse femtobarns, the number of observed events is found to be consistent with the standard model background prediction. Assuming a branching fraction of 100% for the decay T to tZ, a T quark with a mass less than 475 GeV/c^2 is excluded at the 95% confidence level.

Chatrchyan, Serguei; et al.

2011-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "leptons leptons leptons" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


481

Dark matter and the solar neutrino problem: Can particle physics provide a single solution  

SciTech Connect (OSTI)

We show how a relatively simple extension of the standard model can give a natural'' explanation for both the solar neutrino and dark matter problems. What is required is a new stable neutral lepton with a mass in the 4--8 GeV range. One possibility is a fourth generation neutrino interacting with matter either electromagnetically or via higgs-exchange (in addition, of course, to Z{degree}-exchange). In the former case, a new charged lepton with mass {approximately}10GeV would be required in order to generate a sufficiently large magnetic moment. The present experimental situation makes this possibility rather doubtful. In the latter case, a light higgs with mass {approximately}1GeV is required; this is still not ruled out experimentally. In any case, direct (or indirect) detection of dark matter will, during the next year, seal the fate of this model. 29 refs.

West, G.B. (Los Alamos National Lab., NM (USA))

1989-01-01T23:59:59.000Z

482

Search for Rare and Forbidden Charm Meson Decays at Fermilab E791  

E-Print Network [OSTI]

We report the results of a blind search for flavor-changing neutral current, lepton-flavor violating, and lepton-number violating decays of D+, D(s)+, and D0 mesons (and their antiparticles) into modes containing muons and electrons. Using data from Fermilab charm hadroproduction experiment E791, we examine the pi l l and K l l decay modes of D+ and D(s)+ and the l+ l- decay modes of D0. No evidence for any of these decays is found. Therefore, we present branching-fraction upper limits at 90% confidence level for the 24 decay modes examined. Eight of these modes have no previously reported limits, and fourteen are reported with significant improvements over previously published results.

Fermilab E791 Collaboration; D. J. Summers

2000-10-01T23:59:59.000Z

483

Masses of Fundamental Particles  

E-Print Network [OSTI]

In the original paper entitled, "Masses of Fundamental Particles"(arXiv:1109.3705v5, 10 Feb 2012), not only the masses of fundamental particles including the weak bosons, Higgs boson, quarks, and leptons, but also the mixing angles of quarks and those of neutrinos are all explained and/or predicted in the unified composite models of quarks and leptons successfully. In this addendum entitled, "Higgs Boson Mass in the Minimal Unified Subquark Model", it is emphasized that the Higgs boson mass is predicted to be about 130Gev in the minimal unified subquark model, which agrees well with the experimental values of 125-126GeV recently found by the ATLAS and CMS Collaborations at the LHC.

Hidezumi Terazawa

2014-06-11T23:59:59.000Z

484

E1 Working Group Summary: Neutrino Factories and Muon Colliders  

E-Print Network [OSTI]

We are in the middle of a time of exciting discovery, namely that neutrinos have mass and oscillate. In order to take the next steps to understand this potential window onto what well might be the mechanism that links the quarks and leptons, we need both new neutrino beams and new detectors. The new beamlines can and should also provide new laboratories for doing charged lepton flavor physics, and the new detectors can and should also provide laboratories for doing other physics like proton decay, supernovae searches, etc. The new neutrino beams serve as milestones along the way to a muon collider, which can answer questions in yet another sector of particle physics, namely the Higgs sector or ultimately the energy frontier. In this report we discuss the current status of neutrino oscillation physics, what other oscillation measurements are needed to fully explore the phenomenon, and finally, what other new physics can be explored as a result of building of these facilities.

D. Harris

2001-11-02T23:59:59.000Z

485

Search for muon-electron and muon-positron conversion  

Science Journals Connector (OSTI)

Limits on the lepton-flavor-violating reactions ?-+Z?e-+Z and ?-+Z?e++(Z-2), muon-electron and muon-positron conversion, have been obtained from a search performed at TRIUMF using a time-projection chamber. Upper limits (90% C.L.) for the branching ratios compared to ordinary muon capture for a titanium target are R(Ti)=?(?-Ti?e-Ti)/?(?-Ti capture)<4.610-12 and R+(Ti)=?(?-Ti?e+Ca*)/?(?-Ti capture)<.1.710-10 A smaller data set obtained using a lead target yielded R-(Pb)<4.910-10. The implications of these results for extensions of the standard model which allow lepton-flavor violation are discussed.

S. Ahmad; G. Azuelos; M. Blecher; D. A. Bryman; R. A. Burnham; E. T. H. Clifford; P. Depommier; M. S. Dixit; K. Gotow; C. K. Hargrove; M. Hasinoff; M. Leitch; J. A. Macdonald; H. Mes; I. Navon; T. Numao; J-M. Poutissou; R. Poutissou; P. Schlatter; J. Spuller; J. Summhammer

1988-10-01T23:59:59.000Z

486

BaBar: Searching for the Unexpected  

SciTech Connect (OSTI)

With over 300 million B-Bbar pairs delivered by the PEP-II B-factory, and over 200 publications, the Babar experiment has studied a very broad range of B, charm, tau, and QCD topics. In fact, the physics at Babar is so wide-ranging that it threatens to overwhelm any summary. Instead, in this colloquium I will focus on just a few topics selected for their potential to find a truly unexpected result. These include CP violation in rare B decays, leptonic B decays, and lepton-flavor violating tau decays. Each measurement, the currently predicted result, and the potential for uncovering the unexpected now and into the future, will be gently, but thoroughly, described.

Roodman, Aaron

2006-04-24T23:59:59.000Z

487

Method and system for improved resolution of a compensated calorimeter detector  

DOE Patents [OSTI]

An improved method and system for a depleted uranium calorimeter detector used in high energy physics experiments. In a depleted uranium calorimeter detector, the energy of a particle entering the calorimeter detector is determined and the output response of the calorimeter detector is compensated so that the ratio of the integrated response of the calorimeter detector from a lepton to the integrated response of the calorimeter detector from a hadron of the same energy as the lepton is approximately equal to 1. In the present invention, the energy of a particle entering the calorimeter detector is determined as a function of time and the hadron content of the response of the calorimeter detector is inferred based upon the time structure of the energy pulse measured by the calorimeter detector. The energy measurement can be corrected based on the inference of the hadron content whereby the resolution of the calorimeter can be improved.

Dawson, John W. (Willowbrook, IL)

1991-01-01T23:59:59.000Z

488

TeV Gamma-rays from the Northern Sky Pulsar Wind Nebulae  

E-Print Network [OSTI]

We estimate the TeV gamma-ray fluxes expected from the population of young pulsars in terms of the self-consistent time dependent hadronic-leptonic model for the high energy processes inside the pulsar wind nebulae. This radiation model bases on the hypothesis of Arons and collaborators who postulate that leptons are accelerated inside the nebulae as a result of resonant scattering on heavy nuclei, which in turn are accelerated in the pulsar wind region or the pulsar inner magnetosphere. Our aim is to find out which nebulae on the nortehrn hemisphere are the best candidates for detection at energies above 60 GeV and 200 GeV by the next generation of low threshold Cherenkov telescopes.

W. Bednarek; M. Bartosik

2005-09-29T23:59:59.000Z

489

Hypercharge generators in SU(7) grand unification models  

Science Journals Connector (OSTI)

We present a thorough analysis of U(1) generators in all of the nine possible symmetry-breaking patterns that reduce SU(7) down to SUc(3)SU(2)U(1). There is one allowed representation that contains three generations of leptons and at least two generations of quarks and satisfies anomaly freedom, reality under SUc(3) and Uem(1), and complexity under SUc(3)SU(2)U(1). In addition, three other representations, two having only one and two of the three lepton-quark generations complex with respect to SUc(3)SU(2)U(1), and the other having fractionally charged color singlets in pairs embedded in the fundamental representation [7], are also analyzed for completeness.

Kyungsik Kang and In-Gyu Koh

1982-03-15T23:59:59.000Z

490

Left-right models with light neutrino mass prediction and dominant neutrinoless double beta decay rate  

E-Print Network [OSTI]

In TeV scale left-right symmetric models, new dominant predictions to neutrinoless double beta decay and light neutrino masses are in mutual contradiction because of large contribution to the latter through popular seesaw mechanisms. We show that in a class of left-right models with high-scale parity restoration, these results coexist without any contravention with neutrino oscillation data and the relevant formula for light neutrino masses is obtained via gauged inverse seesaw mechanism. The most dominant contribution to the double beta decay is shown to be via $W^-_L- W^-_R$ mediation involving both light and heavy neutrino exchanges, and the model predictions are found to discriminate whether the Dirac neutrino mass is of quark-lepton symmetric origin or without it. We also discuss associated lepton flavor violating decays.

M. K. Parida; Sudhanwa Patra

2013-01-14T23:59:59.000Z

491

Neutrinoless Double-Beta Decay: a Probe of Physics Beyond the Standard Model  

E-Print Network [OSTI]

In the Standard Model the total lepton number is conserved. Thus, neutrinoless double-beta decay, in which the total lepton number is violated by two units, is a probe of physics beyond the Standard Model. After a brief summary of the present status of our knowledge of neutrino masses and mixing and an introduction to the seesaw mechanism for the generation of light Majorana neutrino masses, in this review we discuss the theory and phenomenology of neutrinoless double-beta decay. We present the basic elements of the theory of neutrinoless double-beta decay, our view of the present status of the challenging problem of the calculation of the nuclear matrix element of the process and a summary of the experimental results.

Bilenky, S M

2014-01-01T23:59:59.000Z

492

Neutrinoless Double-Beta Decay: a Probe of Physics Beyond the Standard Model  

E-Print Network [OSTI]

In the Standard Model the total lepton number is conserved. Thus, neutrinoless double-beta decay, in which the total lepton number is violated by two units, is a probe of physics beyond the Standard Model. After a brief summary of the present status of our knowledge of neutrino masses and mixing and an introduction to the seesaw mechanism for the generation of light Majorana neutrino masses, in this review we discuss the theory and phenomenology of neutrinoless double-beta decay. We present the basic elements of the theory of neutrinoless double-beta decay, our view of the present status of the challenging problem of the calculation of the nuclear matrix element of the process and a summary of the experimental results.

S. M. Bilenky; C. Giunti

2014-11-18T23:59:59.000Z

493

Absence of Right-Handed Neutrino in Weak Interactions: Explanation via Nonlinear Electroweak Model  

E-Print Network [OSTI]

The nonlinear SU(2) electroweak model is used to explain the absence of the right-handed neutrino in weak interactions. Two covariant eigenvalue constraints which affect the transformation lead to two classes of right-handed leptons, and make possible invariant mass terms without the Higgs doublet. A covariant picture of neutrinos with mass is presented. A new invariant form for the boson potentials is described in which the boson mass terms arises via the adjoint field. This model also indicates a different region of matter involving coupled leptons that are "blind" to the massless electromagnetic field but "see" four massive potentials that are themselves blind to the electromagnetic field. We argue that these more difficult to detect "dark" fields provide a possible contribution to the missing mass.

Bill Dalton

2010-06-21T23:59:59.000Z