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Note: This page contains sample records for the topic "quarks und leptonen" 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.


1

Quarks  

NLE Websites -- All DOE Office Websites (Extended Search)

zusammengesetzt sind. Es gibt sechs Quarks, aber die Physiker reden lieber von drei Quark-paaren: updown, charmstrange, and topbottom. (Zu jedem Quark existiert ein...

2

Quark Charge  

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Bruchteile von 23 und 13 der elektrischen Ladung. Sie werden aber immer nur in Teilchen gefunden, die eine ganzzahlige elektrische Ladung haben. Isolierte Quarks knnen nicht...

3

Quark  

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DeGrand (University of Colorado, Boulder) and B. Krusche (University of Basel). 14.1. Quantum numbers of the quarks Quarks are strongly interacting fermions with spin 12 and, by...

4

Jenseits des Standard Modells  

NLE Websites -- All DOE Office Websites (Extended Search)

The Standard Model The Standard Model Unngelöste Rätsel Jenseits des Standard Modells Das Standard Modell gibt auf viele Fragen, über Struktur und Stabilität der Materie eine Antwort. Dazu braucht es nur die sechs Sorten von Quarks und Leptonen und die vier fundamentalen Kräfte. Aber das Standard Modell ist nicht vollständig; es gibt noch viele unbeantwortete Fragen. Eigentlich sollten wir aus Gründen der Symmetrie im Weltraum gleichviel Materie wie Antimaterie beobachten. Wir finden aber praktisch nur normale Materie! Warum? Woraus besteht die "Dunkle Materie", die wir nicht sehen können, die aber im Universum sichtbare Gravitationswirkungen zeigt? Warum kann das Standard Modell die Massen der Teilchen nicht vorhersagen? Sind Quarks and Leptonen wirklich fundamentae Teilchen, oder sind sie aus noch elementareren Partikeln aufgebaut?

5

Das Standard Modell  

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Model Model Was ist fundamental? Das Standard Modell Physiker haben eine Theorie - Das Standard Modell - entwickelt, welche erklärt, woraus die Welt besteht und was sie zusammenhält. Es ist eine einfache und überzeugende Theorie, welche hunderte von Teilchen und ihre gegenseitigen Wechselwirkungen erklärt. Dazu braucht sie nur wenige elementare Teilchen : 6 Quarks. 6 Leptonen. Das bekannteste Lepton ist das Elektron. Wir reden gleich von Leptonen. Kraft-Träger Teilchen, wie z.B. das Photon. Wir werden später über diese Teilchen reden. Alle bekannten materiellenTeilchen sind aus Quarks und Leptonen zusammengesetzt und sie wechselwirken untereinander durch den Austausch von Kraft-Träger Teilchen. Das Standard Modell ist eine gute Theorie. Eine grosse Zahl von Experimenten haben ihre Voraussagen mit unglaublicher Präzision bestätigt und alle Teilchen, welche die Theorie bis heute vorausgesagt hat, wurden auch gefunden. Aber die Theorie kann nicht alles erklären. Die Schwerkraft zum Beispiel ist nicht im Standard Modell eingeschlossen.

6

Eingeschlossene Quarks  

NLE Websites -- All DOE Office Websites (Extended Search)

Quarks sind - zusammen mit andern Quarks - immer in Gruppen (Hadronen) gebunden (engl. quark confinement). Diese zusammengesetzten Zustnde sind farbneutral. Im Verlauf der...

7

Fragen zum Standard Modell  

NLE Websites -- All DOE Office Websites (Extended Search)

Quiz What is Fundamental? Fragen zum Standard Modell Frage: Aus wievielen elementaren Teilchen sind die mehr als hundert bekannten Teilchen aufgebaut? Antwort 6 Quarks, 6 Leptonen,...

8

Top Quark  

NLE Websites -- All DOE Office Websites (Extended Search)

quark TOP Volver Principal ESTOY PERDIDO El 2 de marzo de 1995, el Fermilab anunci el descubrimiento del quark top, el ltimo de los seis quarks, cuya existencia haba sido...

9

Quark Interactions  

NLE Websites -- All DOE Office Websites (Extended Search)

Interacciones del quark Interacciones del quark Volver Principal ESTOY PERDIDO!!! Los quarks tienen carga eléctrica, por lo que sufren interacciones electromagnéticas. Los quarks tienen carga de color, de modo que sufren las interacciones fuertes. Las interacciones fuertes causan que los quarks se combinen formando hadrones. Las interacciones fuertes residuales mantienen a los hadrones juntos, para formar núcleos. Los diferentes tipos de quark (u, d, c, ...) se denominan sabores. El sabor sólo se altera por medio de interacciones debiles cargadas. Por ejemplo: Todos los quarks del lado izquierdo también aparecen del lado derecho . Sin embargo, cuando un quark emite un bosón ( virtual) W+ o W-, debe cambiar su carga eléctrica y, por lo tanto, su sabor. El proceso débil predominante es el que involucra transiciones entre quarks de la misma

10

Quark Chart  

NLE Websites -- All DOE Office Websites (Extended Search)

Es muy difcil determinar la masa, o incluso definir qu se entiende por masa de un quark, dado que un quark no se puede aislar. sto es especialmente cierto para la...

11

Funny Quarks  

NLE Websites -- All DOE Office Websites (Extended Search)

graciosos quarks graciosos quarks Volver Principal ESTOY PERDIDO!!! Un poco de la historia del quark: En 1964 Murray Gell-Mann y George Zweig sugirieron que cientos de las partículas conocidas hasta el momento, podrían ser explicadas como una combinación de sólo 3 partículas fundamentales. Gell-Mann eligió el nombre caprichoso de "quarks" para estos constituyentes. Esta palabra aparece en la frase "three quarks for Muster Mark" en la novela de James Joyce, Finnegan's Wake. La parte revolucionaria de la idea era que ellos debieron asignarle a los quarks cargas eléctricas de 2/3 y -1/3 (en unidades de la carga del protón): nunca habían sido observadas cargas como esas. Primero los quarks fueron considerados como un truco matemático, pero los experimentos

12

Nationale und Internationale Zusammenarbeit Nationale und Internationale  

E-Print Network (OSTI)

¨ur Umwelttechnik und Energiewirtschaft, Hamburg TU Hamburg-Harburg, Kunststoffe und Verbundwerkstoffe, Hamburg

13

Quark Matter  

NLE Websites -- All DOE Office Websites (Extended Search)

Quark Quark Matter in Neutron Stars Prashanth Jaikumar Argonne National Laboratory, (PHY) September 7th, 2006 . - p.1/29 Outline * Neutron stars: observations by a theorist . - p.2/29 Outline * Neutron stars: observations by a theorist * Mass-Radius constraints on Equation of State (EoS) . - p.2/29 Outline * Neutron stars: observations by a theorist * Mass-Radius constraints on Equation of State (EoS) * Is quark matter inside neutron stars ruled out? . - p.2/29 Outline * Neutron stars: observations by a theorist * Mass-Radius constraints on Equation of State (EoS) * Is quark matter inside neutron stars ruled out? ------------------------ * Strange Quark stars: Features and "Findings" . - p.2/29 Outline * Neutron stars: observations by a theorist * Mass-Radius constraints on Equation of State (EoS) * Is quark matter inside neutron stars ruled out? ------------------------

14

The Top Quark's Discovery  

NLE Websites -- All DOE Office Websites (Extended Search)

1995, Fermilab announced the discovery of the top quark, the last of the six predicted quarks. The search began in 1977 when physicists found the fifth quark, bottom, at Fermilab....

15

The Top Quark's Discovery  

NLE Websites -- All DOE Office Websites (Extended Search)

Im Mrz 1995, teilte Fermilab die Entdeckung des top Quark - des letzten der sechs vorhergesagten Quarks - mit. Die Suche begann im Jahre 1977, zusammen mit der erfolgreichen...

16

quark_s027-web.dvi  

NLE Websites -- All DOE Office Websites (Extended Search)

FREE QUARK SEARCHES The basis for much of the theory of particle scattering and hadron spectroscopy is the construction of the hadrons from a set of fractionally charged...

17

Minor Chemie und Molekulare Wissenschaften und Major Biologie und Erdwissenschaften  

E-Print Network (OSTI)

Minor Chemie und Molekulare Wissenschaften und Major Biologie und Erdwissenschaften Stundenplan 1 Chemie I Prof. J. Hulliger UG 113 5 ECTS 10.15-11.00 Allgemeine Chemie I Prof. J. Hulliger UG 113 Allgemeine Chemie I Prof. J. Hulliger UG 113 11.15-12.00 12.15-13.00 Allgemeine Chemie I Prof. J. Hulliger UG

Mühlemann, Oliver

18

Top Quark Activitiy Introduction  

NLE Websites -- All DOE Office Websites (Extended Search)

Usa la conservacin del momento lineal para calcular la masa del quark top a partir de datos de D Los datos del quark top al alcance de los estudiantes. Para profesores -...

19

Top Quark Activitiy Introduction  

NLE Websites -- All DOE Office Websites (Extended Search)

of Momentum to Calculate the Mass of the Top Quark from D-Zero Data Making top quark data accessible to students. Ed Home - Data Home - Teacher Page - Student Activity Page -...

20

Glossary Item - Quark  

NLE Websites -- All DOE Office Websites (Extended Search)

family consists of Top and Bottom quarks and only exist at very high energies. The Top quark was finally discovered in 1995 at the Fermi National Accelerator Laboratory. Particle...

Note: This page contains sample records for the topic "quarks und leptonen" 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

Nationale und Internationale Zusammenarbeit Nationale und Internationale  

E-Print Network (OSTI)

Systems, Hamburg TU Hamburg-Harburg, Institut f¨ur Umwelttechnik und Energiewirtschaft, Hamburg TU Hamburg

22

Top quark physics  

Science Conference Proceedings (OSTI)

The top quark, when it was finally discovered at Fermilab in 1995 completed the three-generation structure of the Standard Model (SM) and opened up the new field of top quark physics. Viewed as just another SM quark, the top quark appears to be a rather uninteresting species. Produced predominantly, in hadron-hadron collisions, through strong interactions, it decays rapidly without forming hadrons, and almost exclusively through the single mode t {r_arrow} Wb. The relevant CKM coupling V{sub tb} is already determined by the (three-generation) unitarity of the CKM matrix. Rare decays and CP violation are unmeasurable small in the SM. Yet the top quark is distinguished by its large mass, about 35 times larger than the mass of the next heavy quark, and intriguingly close to the scale of electroweak (EW) symmetry breaking. This unique property raises a number of interesting questions. Is the top quark mass generated by the Higgs mechanism as the SM predicts and is its mass related to the top-Higgs-Yukawa coupling? Or does it play an even more fundamental role in the EW symmetry breaking mechanism? If there are new particles lighter than the top quark, does the top quark decay into them? Could non-SM physics first manifest itself in non-standard couplings of the top quark which show up as anomalies in top quark production and decays? Top quark physics tries to answer these questions. Several properties of the top quark have already been examined at the Tevatron. These include studies of the kinematical properties of top production, the measurements of the top mass, of the top production cross-section, the reconstruction of t{bar t}pairs in the fully hadronic final states, the study of {tau} decays of the top quark, the reconstruction of hadronic decays of the W boson from top decays, the search for flavor changing neutral current decays, the measurement of the W helicity in top decays, and bounds on t{bar t} spin correlations. Most of these measurements are limited by the small sample of top quarks collected at the Tevatron up to now. The LHC is, in comparison, a top factory, producing about 8 million t{bar t}pairs per experiment per year at low luminosity (10 fb{sup {minus}1}/year), and another few million (anti-)tops in EW single (anti-)top quark production. They therefore expect that top quark properties can be examined with significant precision at the LHC. Entirely new measurements can be contemplated on the basis of the large available statistics.

Ahmadov, A.; Azuelos, G.; Bauer, U.; Belyaev, A.; Berger, E. L.; Sullivan, Z.; Tait, T. M. P.

2000-03-24T23:59:59.000Z

23

Quark Matter 2004  

NLE Websites -- All DOE Office Websites (Extended Search)

Seventeenth International Conference on Ultra-Relativistic Nucleus-Nucleus Collisions (Quark Matter 2004) took place in Oakland, California from January 11 - 17, 2004. The location...

24

1 FREE QUARK SEARCHES  

E-Print Network (OSTI)

The basis for much of the theory of particle scattering and hadron spectroscopy is the construction of the hadrons from a set of fractionally charged constituents (quarks). A central but unproven hypothesis of this theory, Quantum Chromodynamics, is that quarks cannot be observed as free particles but are confined to mesons and baryons. Experiments show that it is at best difficult to unglue quarks. Accelerator searches at increasing energies have produced no evidence for free quarks, while only a few cosmic-ray and matter searches have produced uncorroborated events. This compilation is only a guide to the literature, since the quoted experimental limits are often only indicative. Reviews

unknown authors

2004-01-01T23:59:59.000Z

25

1 FREE QUARK SEARCHES  

E-Print Network (OSTI)

The basis for much of the theory of particle scattering and hadron spectroscopy is the construction of the hadrons from a set of fractionally charged constituents (quarks). A central but unproven hypothesis of this theory, Quantum Chromodynamics, is that quarks cannot be observed as free particles but are confined to mesons and baryons. Experiments show that it is at best difficult to unglue quarks. Accelerator searches at increasing energies have produced no evidence for free quarks, while only a few cosmic-ray and matter searches have produced uncorroborated events. This compilation is only a guide to the literature, since the quoted experimental limits are often only indicative. Reviews

unknown authors

2008-01-01T23:59:59.000Z

26

1 FREE QUARK SEARCHES  

E-Print Network (OSTI)

The basis for much of the theory of particle scattering and hadron spectroscopy is the construction of the hadrons from a set of fractionally charged constituents (quarks). A central but unproven hypothesis of this theory, Quantum Chromodynamics, is that quarks cannot be observed as free particles but are confined to mesons and baryons. Experiments show that it is at best difficult to unglue quarks. Accelerator searches at increasing energies have produced no evidence for free quarks, while only a few cosmic-ray and matter searches have produced uncorroborated events. This compilation is only a guide to the literature, since the quoted experimental limits are often only indicative. Reviews

unknown authors

2006-01-01T23:59:59.000Z

27

Looking for the Top Quark - Lab Pages - My Quarks  

NLE Websites -- All DOE Office Websites (Extended Search)

Teacher Overview VA State Standards of Learning Download this Activity Next Page Looking for the Top Quark - Lab Pages - My Quarks...

28

Ein Quark/Gluon Event  

NLE Websites -- All DOE Office Websites (Extended Search)

QuarkGluon Event Wie interpretiert man die Daten? Ein QuarkGluon Event Diese beiden Bilder zeigen Ergebnisse von Kollisionen, die in e- e+ Teilchenstrahlen stattfinden. Die...

29

If different types of quarks have...  

NLE Websites -- All DOE Office Websites (Extended Search)

are each made from three quarks. A proton is made up of two Up quarks and a Down quark while a neutron is made from two Down quarks and an Up quark. If protons and neutrons...

30

quark-web.dvi  

NLE Websites -- All DOE Office Websites (Extended Search)

FREE FREE QUARK SEARCHES The basis for much of the theory of particle scattering and hadron spectroscopy is the construction of the hadrons from a set of fractionally charged constituents (quarks). A central but unproven hypothesis of this theory, Quantum Chromodynamics, is that quarks cannot be observed as free particles but are confined to mesons and baryons. Experiments show that it is at best difficult to "unglue" quarks. Accelerator searches at increasing energies have pro- duced no evidence for free quarks, while only a few cosmic-ray and matter searches have produced uncorroborated events. This compilation is only a guide to the literature, since the quoted experimental limits are often only indicative. Reviews can be found in Refs. 1-4. References 1. M.L. Perl, E.R. Lee, and D. Lomba, Mod. Phys. Lett. A19, 2595 (2004). 2. P.F. Smith, Ann. Rev. Nucl. and Part. Sci. 39,

31

Top Quark Properties  

Science Conference Proceedings (OSTI)

Since its discovery in 1995 by the CDF and D0 collaborations at the Fermilab Tevatron collider, the top quark has undergone intensive studies. Besides the Tevatron experiments, with the start of the LHC in 2010 a top quark factory started its operation. It is now possible to measure top quark properties simultaneously at four different experiments, namely ATLAS and CMS at LHC and CDF and D0 at Tevatron. Having collected thousands of top quarks each, several top quark properties have been measured precisely, while others are being measured for the first time. In this article, recent measurements of top quark properties from ATLAS, CDF, CMS and D0 are presented, using up to 5.4 fb{sup -1} of integrated luminosity at the Tevatron and 1.1 fb{sup -1} at the LHC. In particular, measurements of the top quark mass, mass difference, foward backward charge asymmetry, t{bar t} spin correlations, the ratio of branching fractions, W helicity, anomalous couplings, color flow and the search for flavor changing neutral currents are discussed.

Peters, Yvonne

2011-12-01T23:59:59.000Z

32

quarks-web.dvi  

NLE Websites -- All DOE Office Websites (Extended Search)

and and 2013 update for the 2014 edition (URL: http://pdg.lbl.gov) December 18, 2013 12:00 - 2- the introduction of a dimensionful scale parameter µ. The mass parameters in the QCD Lagrangian Eq. (1) depend on the renor- malization scheme used to define the theory, and also on the scale parameter µ. The most commonly used renormalization scheme for QCD perturbation theory is the MS scheme. The QCD Lagrangian has a chiral symmetry in the limit that the quark masses vanish. This symmetry is spontaneously broken by dynamical chiral symmetry breaking, and explicitly broken by the quark masses. The nonperturbative scale of dynamical chiral symmetry breaking, Λ χ , is around 1 GeV [2]. It is conventional to call quarks heavy if m > Λ χ , so that explicit chiral symmetry breaking dominates (c, b, and t quarks are heavy), and light if m < Λ χ , so that spontaneous chiral symmetry breaking

33

QuarkNet Stories  

NLE Websites -- All DOE Office Websites (Extended Search)

Technical Workforce Centers at 53 universities and labs 18 HEP experiments 475 high schools in 28 states 60 ,000 students per year The focus of QuarkNet is to involve teachers...

34

Top quark physics: Overview  

SciTech Connect

In this presentation I will primarily focus on top quark physics but I will include a discussion of the W-boson mass and the possibility of discovering a light Higgs boson via associated production at the Tevatron.

Parke, S.

1998-01-01T23:59:59.000Z

35

QuarkNet Information  

NLE Websites -- All DOE Office Websites (Extended Search)

Beginning its 17th year, QuarkNet involves about 100,000 students from 500+ US high schools with opportunities to: Analyze real data online. Collaborate with students worldwide....

36

Lehrveranstaltungskatalog fur Studiengange und Lehrangebote  

E-Print Network (OSTI)

. Deshalb wird in diesem gemeinsam mit Siemens Energiewirtschaft (KWU), Erlangen, und dem Fraunhofer Reininger und Dr. Mattis von Siemens Energiewirtschaft ( KWU ) in Erlangen gedankt werden. Literatur 1. Buck

Drozda, Martin

37

Medieninformation Kommunikation und Medien  

E-Print Network (OSTI)

Energiewirtschaft zu erkennen und zu lösen, bietet die TU Darmstadt ab dem Wintersemester 2012/13 den neuen Master

Reggelin, Michael

38

Triggering Top Quark Events  

E-Print Network (OSTI)

Collisions at the LHC occur at a rate of up to 40 MHz, much larger than the 200 Hz storage capacity of the ATLAS experiment. The ATLAS trigger system has the challenging task of rejecting 99.9995 % of the events produced in collisions, while keeping those needed to achieve the physics goals of the experiment. This note evaluates the expected performance of the trigger system in top quark events by investigating the response of the trigger system to single objects such as a muon, an electron or a jet originating from top quark decays. In addition, the methodology needed to efficiently select top quark events in the online trigger system is discussed including methods to determine trigger efficiencies from data.

The ATLAS collaboration

2009-01-01T23:59:59.000Z

39

Quark Matter 2004 Conference Hotel  

NLE Websites -- All DOE Office Websites (Extended Search)

as the conference Hotel. It is adjacent to the Oakland Convention Center where all Quark Matter talks will be held. Quark Matter attendees can get a reduced price of 126...

40

Sample QuarkNet Proposal  

NLE Websites -- All DOE Office Websites (Extended Search)

Department Address: Florida State University Keen Building, City, State: Tallahassee, FL Zip: 32306-4350 Local QuarkNet Leader(s): Local QuarkNet Participants are: Susan Blessing,...

Note: This page contains sample records for the topic "quarks und leptonen" 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

Quark-gluon plasma paradox  

E-Print Network (OSTI)

Based on simple physics arguments it is shown that the concept of quark-gluon plasma, a state of matter consisting of uncorrelated quarks, antiquarks, and gluons, has a fundamental problem.

Dariusz Miskowiec

2007-07-06T23:59:59.000Z

42

Search for stable excited quarks  

Science Conference Proceedings (OSTI)

The possibility of quarks in triality-zero color representations, e.g., 8 or 10, is considered. (GHT)

Baltay, C.; Littenberg, L.; Paige, F.E.

1982-01-01T23:59:59.000Z

43

QuarkNet  

NLE Websites -- All DOE Office Websites (Extended Search)

QuarkNet: The science connection you've been waiting for! QuarkNet: The science connection you've been waiting for! The Opportunity: "Your program rejuvenates my soul. It connects me with a cadre of intelligent and excited educators. It reinvigorates my teaching and provides me avenues to extend and enliven the projects that I can offer my students. Without the Quarknet program I am sure that I would have left teaching years ago." The Players: High school students, teachers and physicsts working together on physics research projects exploring the hidden nature of matter, energy, space and time. The Questions: What are the origins of mass? Can the basic forces of nature be unified? How did the universe begin? How will it evolve? LHC & Fermilab Links For Teachers For Students CERN Homepage ATLAS Experiment

44

Quark Lepton Similarity  

E-Print Network (OSTI)

We propose the lepton mixing matrix at high energy scale to be connected to quark mixing matrix by the similar transformation. The similarity between CKM and PMNS significantly narrows down the ranges in physical parameters. The condition requires $\\sin\\theta_{13}$ not to be larger than 0.15, masses to be of quasi-degenerate normal ordering, and $\\tan\\beta$ to be large.

Seungsu Hwang; Kim Siyeon

2010-08-20T23:59:59.000Z

45

Lehrveranstaltungskatalog fur Studiengange und Lehrangebote  

E-Print Network (OSTI)

Mitwirkung von Unternehmen und Verbänden der Energiewirtschaft, mit Exkursionen Honorarprofessor Dr. Michael Energiewirtschaftsrecht - unter Mitwirkung von Unternehmen und Verbänden der Energiewirtschaft, mit Exkursionen

Drozda, Martin

46

quarks_q000.dvi  

NLE Websites -- All DOE Office Websites (Extended Search)

- 1- QUARK MASSES Written by A. Manohar (University of California, San Diego). A. Introduction This note discusses some of the theoretical issues involved in the determination of...

47

Top quark physics at CDF  

SciTech Connect

We present the recent results of top-quark physics using up to 6 fb{sup -1} of p{bar p} collisions analyzed by the CDF collaboration. The large number of top quark events analyzed, of the order of several thousands, allows stringent checks of the standard model predictions. Also, the top quark is widely believed to be a window to new physics. We present the latest measurements of top quark intrinsic properties as well as direct searches for new physics in the top sector.

Potamianos, Karolos

2011-12-01T23:59:59.000Z

48

edited1_QuarkWorkbench  

NLE Websites -- All DOE Office Websites (Extended Search)

QUARK WORKBENCH TEACHER NOTES DESCRIPTION Students use cleverly constructed puzzle pieces and look for patterns in how those pieces can fit together. The puzzles pieces obey, as...

49

Looking for the Top Quark - Teacher Overview  

NLE Websites -- All DOE Office Websites (Extended Search)

Scientists had evidence for the existence of all of the quarks except for the Top quark. If the Top quark couldn't be found, atomic theory would have to be drastically...

50

Looking for the Top Quark Game  

NLE Websites -- All DOE Office Websites (Extended Search)

In Looking for the Top Quark, each player receives six quarks that they hide on a grid. The players use coordinates to find their opponent's hidden quarks. The first player...

51

Cold quark matter in compact stars  

Science Conference Proceedings (OSTI)

We used an equation of state for the cold quark matter to the study of properties of quark stars. We also discuss the absolute stability of quark matter and compute the mass-radius relation for self-bound stars.

Franzon, B.; Fogaca, D. A.; Navarra, F. S. [Instituto de Fisica, Universidade de Sao Paulo Rua do Matao, Travessa R, 187, 05508-090 Sao Paulo, SP (Brazil); Horvath, J. E. [Instituto de Astronomia, Geofisica e Ciencias Atmosfericas, Universidade de Sao Paulo, Rua do Matao, 1226, 05508-090, Sao Paulo, SP (Brazil)

2013-03-25T23:59:59.000Z

52

Angewandte Biowissenschaften Departement Chemie und  

E-Print Network (OSTI)

Angewandte Biowissenschaften Departement Chemie und CHABD RUZICKA PREIS 2012Departement Chemie und wichtigsten Nachwuchsförderungspreise auf dem Gebiet der Chemie in der Schweiz. Leopold Ruzicka wurde am 13 in Karlsruhe Chemie und war von 1912 bis 1916 Assistent an der ETH Zürich. Anschliessend arbeitete er für die

Giger, Christine

53

Thermalization of heavy quarks in the quark-gluon plasma  

E-Print Network (OSTI)

Charm- and bottom-quark rescattering in a quark-gluon plasma (QGP) is investigated with the objective of assessing the approach toward thermalization. Employing a Fokker-Planck equation to approximate the collision integral of the Boltzmann equation we augment earlier studies based on perturbative parton cross sections by introducing resonant heavy-light quark interactions. The latter are motivated by recent QCD lattice calculations that indicate the presence of "hadronic" states in the QGP. We model these states by colorless (pseudo-) scalar and (axial-) vector D and B mesons within a heavy-quark effective theory framework. We find that the presence of these resonances at moderate QGP temperatures substantially accelerates the kinetic equilibration of c quarks as compared to using perturbative interactions. We also comment on consequences for D-meson observables in ultrarelativistic heavy-ion collisions.

van Hees, H.; Rapp, Ralf.

2005-01-01T23:59:59.000Z

54

Potential energy for quarks  

SciTech Connect

It is argued on theoretical and phenomenological grounds that confinement of quarks is intrinsically a many-body interaction. The Born-Oppenheimer approximation to the bag model is shown to give rise to a static potential energy that consists of a sum of two-body Coulomb terms and a many-body confining term. Following the success of this potential in heavy Q anti Q systems it is being applied to Q/sup 2/ anti Q/sup 2/. Preliminary calculations suggest that dimeson bound states with exotic flavor, such as bb anti s anti s, exist. 13 refs., 5 figs.

Heller, L.

1985-01-01T23:59:59.000Z

55

QCD based static potential between heavy quarks  

SciTech Connect

We calculate the static potential between a quark-anti quark pair using dual potentials to describe long-distance Yang-Mills theory.

Baker, M. [Washington Univ., Seattle, WA (United States). Dept. of Physics; Ball, J.S. [Utah Univ., Salt Lake City, UT (United States). Dept. of Physics; Zachriasen, R. [California Inst. of Tech., Pasadena, CA (United States)

1991-12-31T23:59:59.000Z

56

Quark confinement and hadronic interactions  

SciTech Connect

A study of quark models for many-hadron systems is presented. The starting point in the construction of these nonrelativistic models is a proper formal definition of the concept of color singlet and nonsinglet clusters in a multiquark system which respects the exchange symmetry of the quarks. This definition provides a natural way to impose saturation of the confining forces.

Lenz, F.; Londergan, J.T.; Moniz, E.J.; Rosenfelder, R.; Stingl, M.; Yazaki, K.

1986-08-01T23:59:59.000Z

57

Jet quenching and heavy quarks  

E-Print Network (OSTI)

Jet quenching and more generally physics at high transverse momentum P_T scales is a cornerstone of the heavy-ion physics program at the LHC. In this work, the current understanding of jet quenching in terms of a QCD shower evolution being modified by the surrounding medium is reviewed along with the evidence for this picture from light parton high P_T observables. Conceptually, the same QCD shower description should also be relevant for heavy quarks, but with several important modifications introduced by the quark masses. Thus especially in the limit of small jet energy over quark mass E_jet/m_q, the relevant physics may be rather different from light quark jets, and several attempts to explain the observed phenomenology of heavy quarks at high P_T are discussed here.

Thorsten Renk

2013-09-12T23:59:59.000Z

58

fr Elektrotechnik und Informationstechnik  

E-Print Network (OSTI)

Wissenschaftliche Mitarbeiter und Stipen- diaten Dr. Olaf Adamczyk Stip. M. Sc. Ali Al-Bermani Stip. M. Sc. Mohamed Ebrahim Fahmy Taha El-Darawy Stip. M. Sc. Vijitha Herath M. Sc. Ariya Hidayat Dr.-Ing. Sebastian Hoffmann Dipl.-Ing. Benjamin Koch Dr. rer. nat. Manfred Lichtinger Dr.-Ing. Vitali Mirvoda Stip. Dipl.-Ing. Timo

Noé, Reinhold

59

fr Elektrotechnik und Informationstechnik  

E-Print Network (OSTI)

Mitarbeiter und Stipendiaten Dr. Olaf Adamczyk Dr.-Ing. Suhas Bhandare Stip. M. Sc. Mohamed Ebrahim Fahmy Taha El-Darawy Stip. M. Sc. Vijitha Herath M. Sc. Ariya Hidayat Dipl.-Ing. Sebastian Hoffmann Dr Stip. Dipl.-Ing. Timo Pfau Dr.-Ing. David Sandel Dr.-Ing. Sunil Survaiya Dr.-Ing. Hongbin Zhang

Noé, Reinhold

60

fr Elektrotechnik und Informationstechnik  

E-Print Network (OSTI)

/2009 ­ 02/2010) Prof. Dr.-Ing. Reinhold Noé Personal Wissenschaftliche Mitarbeiter und Stipendiaten Stip. M. Sc. Ali Al-Bermani Stip. M. Sc. Mohamed Ebrahim Fahmy Taha El-Darawy Stip. M. Sc. Vijitha Herath Dr.-Ing. Timo Pfau Stip. M. EE. Kidsanapong Puntsri Dr.-Ing. David Sandel Dr.-Ing. Stephan Schulz Technische

Noé, Reinhold

Note: This page contains sample records for the topic "quarks und leptonen" 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.


61

Active QuarkNet Centers  

NLE Websites -- All DOE Office Websites (Extended Search)

Active QuarkNet Centers Active QuarkNet Centers       QuarkNet Home - Information - Calendar - Contacts - Projects - Forms: EoI - Teachers Centers on a Google Map @ the PTEC website Mentor List Sorted by: Last Name Institution Name First Year in Program Argonne National Laboratory - On sabbatical Black Hills State University Brown, Northeastern & Brandeis Universities Brookhaven National Laboratory, Columbia & Stony Brook Universities Chicago State University Colorado State University Fermilab & University of Chicago Florida Institute of Technology Florida International University Florida State University Hampton, George Mason, William & Mary Universities Idaho State University Indiana University - On sabbatical Johns Hopkins University

62

Top Quark Production at the Tevatron Collider  

Science Conference Proceedings (OSTI)

Top quark physics has been a rich testing ground for the standard model since the top quark discovery in 1995. The large mass of top quark suggests that it could play a special role in searches for new phenomena. In this paper I provide an overview of recent top quark production cross section measurements from both CDF and D0 collaborations and also some new physics searches done in the top quark sector.

Li, Liang; /UC, Riverside

2011-07-01T23:59:59.000Z

63

QuarkNet - Educational Materials  

NLE Websites -- All DOE Office Websites (Extended Search)

2 | Projects | Educational Materials Resources for Teachers This year's QuarkNet teachers compiled a list of files and links that can be used as classroom resources and lesson plan...

64

QuarkNet Boot Camp  

NLE Websites -- All DOE Office Websites (Extended Search)

Overview Memo Milestones Resources Schedule To: All QuarkNet collaborators From: Tom Jordan Date: 18 July 2011 Re: Testing and analysis of early data As you know, CMS has been...

65

Classical Quark Models: An Introduction  

E-Print Network (OSTI)

We present an elementary introduction to some of the quark models used to understand the properties of light mesons and baryons. These lectures are intended for both theoretical and experimental graduate students beginning their study of the strong interaction.

A. W. Thomas; S. V. Wright

1998-08-04T23:59:59.000Z

66

Observation of the Top Quark  

E-Print Network (OSTI)

The D collaboration reports on a search for the Standard Model top quark in pp collisions at p s = 1:8 TeV at the Fermilab Tevatron, with an integrated luminosity of approximately 50 pb \\Gamma1 . We have searched for t t production in the dilepton and single-lepton decay channels, with and without tagging of b-quark jets. We observed 17 events with an expected background of 3:8 \\Sigma 0:6 events. The probability for an upward fluctuation of the background to produce the observed signal is 2 \\Theta 10 \\Gamma6 (equivalent to 4.6 standard deviations). The kinematic properties of the excess events are consistent with top quark decay. We conclude that we have observed the top quark and measure its mass to be 199 +19 \\Gamma21 (stat.) \\Sigma22 (syst.) GeV/c 2 and its production cross section to be 6:4 \\Sigma 2:2 pb. Typeset using REVT E X 3 In the Standard Model (SM), the top quark is the weak isospin partner of the b quark. The D collaboration published a lower limit on the mas...

Abachi Abbott Abolins

1995-01-01T23:59:59.000Z

67

Observation of the Top Quark  

E-Print Network (OSTI)

The D collaboration reports on a search for the Standard Model top quark in pp collisions at p s = 1:8 TeV at the Fermilab Tevatron, with an integrated luminosity of approximately 50 pb \\Gamma1 . We have searched for t t production in the dilepton and single-lepton decay channels, with and without tagging of b-quark jets. We observed 17 events with an expected background of 3:8 \\Sigma 0:6 events. The probability for an upward fluctuation of the background to produce the observed signal is 2 \\Theta 10 \\Gamma6 (equivalent to 4.6 standard deviations). The kinematic properties of the excess events are consistent with top quark decay. We conclude that we have observed the top quark and measure its mass to be 199 +19 \\Gamma21 (stat.) \\Sigma22 (syst.) GeV/c 2 and its production cross section to be 6:4 \\Sigma 2:2 pb. Typeset using REVT E X In the Standard Model (SM), the top quark is the weak isospin partner of the b quark. The D collaboration published a lower limit on the m...

Abachi Abbott

1995-01-01T23:59:59.000Z

68

Fachschaft Chemie und Wirtschaftschemie  

E-Print Network (OSTI)

Fachschaft Chemie und Wirtschaftschemie Albert-Einstein-Allee 11 c/o AStA Uni Ulm 89081 Ulm Tel: +49 731 50-22407 Fax: +49 731 50-22403 E-Mail: fs-chemie@uni-ulm.de Universität Ulm Albert-Einstein-Allee 11 · 89081 Ulm · www.uni-ulm.de Prof.Dr. Gerhard Maas Institut für Organische Chemie I Albert

Pfeifer, Holger

69

Prfungsordnung fr die Bachelor-und Masterstudiengnge Chemie und Molecular Science der Universitt Erlangen-Nrnberg  

E-Print Network (OSTI)

Prüfungsordnung für die Bachelor- und Masterstudiengänge Chemie und Molecular Science der) Bachelorstudium Chemie.........................................................................................13 § 27 Modulprüfungen im Grundabschnitt des Bachelorstudiums Chemie ........13 § 28 Grundlagen- und

Fiebig, Peter

70

Charge asymmetry of top quarks  

E-Print Network (OSTI)

The LHC is a promising machine to discover new physics in the top sector. There are several models that predict the existence of heavy colored resonances decaying to top quarks in the TeV energy range. The production of such resonances might generate a sizable charge asymmetry of top versus antitop quarks. At the Tevatron, a 2 sigma discrepancy with the SM prediction for the forward--backward asymmetry has been found, boosting a renewed interest for this kind of models. We consider a toy model with general flavour dependent couplings of the resonance to quarks, of both vector and axial-vector kind and investigate the possible constraints on the coupling space from the measurement of the asymmetry and the invariant mass distribution at the Tevatron. Then, we define a central asymmetry in a specific kinematic region and investigate its signature at the LHC as well as its statistical significance, for exclusive processes.

Ferrario, Paola

2010-01-01T23:59:59.000Z

71

Charge asymmetry of top quarks  

E-Print Network (OSTI)

The LHC is a promising machine to discover new physics in the top sector. There are several models that predict the existence of heavy colored resonances decaying to top quarks in the TeV energy range. The production of such resonances might generate a sizable charge asymmetry of top versus antitop quarks. At the Tevatron, a 2 sigma discrepancy with the SM prediction for the forward--backward asymmetry has been found, boosting a renewed interest for this kind of models. We consider a toy model with general flavour dependent couplings of the resonance to quarks, of both vector and axial-vector kind and investigate the possible constraints on the coupling space from the measurement of the asymmetry and the invariant mass distribution at the Tevatron. Then, we define a central asymmetry in a specific kinematic region and investigate its signature at the LHC as well as its statistical significance, for exclusive processes.

Paola Ferrario; German Rodrigo

2010-06-29T23:59:59.000Z

72

Quark masses : an environmental impact statement  

E-Print Network (OSTI)

We investigate how the requirement that organic chemistry be possible constrains the values of the quark masses. Specifically, we choose a slice through the parameter space of the Standard Model in which quark masses vary ...

Kimchi, Itamar

2008-01-01T23:59:59.000Z

73

Heavy hadrons in quark-gluon plasma  

SciTech Connect

We use the nonperturbative quark-antiquark potential derived within the Field Correlator Method and the screened Coulomb potential to calculate binding energies and melting temperatures of heavy mesons and baryons in the deconfined phase of quark-gluon plasma.

Narodetskii, I. M., E-mail: naro@itep.ru; Simonov, Yu. A.; Veselov, A. I. [Institute of Theoretical and Experimental Physics (Russian Federation)

2011-03-15T23:59:59.000Z

74

Was "beauty" a quark name they...  

NLE Websites -- All DOE Office Websites (Extended Search)

Was "beauty" a quark name they used in the past? There are several naming conventions in the High Energy Physics community. The names of the quarks don't necessarily mean anything...

75

String model for spinning quark jets  

Science Conference Proceedings (OSTI)

A string model of quark hadronization, taking the quark spin degree of freedom into account, is proposed. The method for using the model in a Monte-Carlo code for jet generation is given.

Artru, X.; Belghobsi, Z. [Universite de Lyon, CNRS/IN2P3 and Universite Lyon 1, Institut de Physique Nucleaire de Lyon, Laboratoire de Physique Theorique, Universite de Jijel (Algeria)

2012-06-27T23:59:59.000Z

76

Top Quark Production at the LHC  

E-Print Network (OSTI)

Top quark production in proton proton collisions at the Large Hadron Collider (LHC) is reviewed using data collected by the ATLAS and CMS detectors. Most recent results on searches for new physics related to top quark production mechanism are included.

Francesco Span; for the ATLAS; CMS collaborations

2011-12-16T23:59:59.000Z

77

Top quark production at the Tevatron  

Science Conference Proceedings (OSTI)

The Fermilab Tevatron has, until recently, been the only accelerator with sufficient energy to produce top quarks. The CDF and D0 experiments have collected large samples of top quarks. We report on recent top quark production measurements of the single top and t{bar t} production cross sections, as well as studies of the t{bar t} invariant mass distribution and a search for highly boosted top quarks.

Varnes, Erich W.; /Arizona U.

2010-09-01T23:59:59.000Z

78

QuarkNet at Work  

NLE Websites -- All DOE Office Websites (Extended Search)

QuarkNet at Work Information for Active Mentors & Teachers     QuarkNet Home - Information - Calendar - Contacts - Projects - Forms: EoI - Teachers Information Active Centers Calendar Contacts Expectations: for Teachers, for Mentors Information on Other Funding Sources Program Overview Support: for Teachers, for Centers Staff Job Description Activities Essential Practices - Teaching with Inquiry (word.doc) Classroom Activities e-Labs: CMS - Cosmic Ray Boot Camp Project Activities Databases: Data Entry (password only) 2012 Center Reporting Resources Important Findings from Previous Years Mentor Tips Associate Teacher Institute Toolkit Print Bibliography - Online Resources Imaging Detector Principles of Professionalism for Science Educators - NSTA position

79

Top Quark Spin Correlations - Theory  

Science Conference Proceedings (OSTI)

The top quark decay width (G{sub F}m{sub t}{sup 3} {approx} 1 GeV) is much larger than the QCD hadronization scale ({Lambda}{sub QCD} {approx} 0.1 GeV) and much larger than the spin decorrelation scale ({Lambda}{sub QCD}{sup 2}/m{sub t} {approx} 0.1 MeV). Therefore, spin correlations in top quark pair production are reflected in angular correlations of the decay products, see [1] and [2].

Parke, Stephen J.; /Fermilab

2012-02-01T23:59:59.000Z

80

kologische und konomische Bewertung von Co-Vergrungsanlagen und deren Standortwahl.  

E-Print Network (OSTI)

??Sowohl in landwirtschaftlichen als auch in abfallwirtschaftlichen Co-Vergrungsanlagen wird Biogas zur Strom- und Wrmeerzeugung energetisch genutzt. In dieser Arbeit werden, aufbauend auf einer Stoff- und (more)

Koch, Matthias

2009-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "quarks und leptonen" 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.


81

The Unquenching of the Quark Model  

Science Conference Proceedings (OSTI)

We present an unquenched quark model for baryons in which the effects of quark-antiquark pair creation (uu-bar, dd and ss-bar) are taken into account in an explicit form via a microscopic, QCD-inspired, quark-antiquark creation mechanism. As an application we discuss the flavor content of octet baryons.

Santopinto, Elena [INFN, via Dodecaneso 33, 16164 Genova (Italy); Bijker, Roelof [ICN-UNAM, AP 70-543, 04510 Mexico DF (Mexico)

2011-05-24T23:59:59.000Z

82

Lattice QCD thermodynamics with Wilson quarks  

E-Print Network (OSTI)

We review studies of QCD thermodynamics by lattice QCD simulations with dynamical Wilson quarks. After explaining the basic properties of QCD with Wilson quarks at finite temperature including the phase structure and the scaling properties around the chiral phase transition, we discuss the critical temperature, the equation of state and heavy-quark free energies.

Shinji Ejiri

2007-04-27T23:59:59.000Z

83

Color superconductivity and the strange quark  

E-Print Network (OSTI)

At ultra-high density, matter is expected to form a degenerate Fermi gas of quarks in which there is a condensate of Cooper pairs of quarks near the Fermi surface: color superconductivity. In these proceedings I review some of the underlying physics, and discuss outstanding questions about the phase structure of ultra-dense quark matter.

Mark G Alford

2005-12-01T23:59:59.000Z

84

LATTICE QCD THERMODYNAMICS WITH WILSON QUARKS.  

SciTech Connect

We review studies of QCD thermodynamics by lattice QCD simulations with dynamical Wilson quarks. After explaining the basic properties of QCD with Wilson quarks at finite temperature including the phase structure and the scaling properties around the chiral phase transition, we discuss the critical temperature, the equation of state and heavy-quark free energies.

EJIRI,S.

2007-11-20T23:59:59.000Z

85

Observation of the Top Quark  

DOE R&D Accomplishments (OSTI)

Top quark production is observed in{bar p}p collisions at{radical}s= 1.8 TeV at the Fermilab Tevatron. The Collider Detector at Fermilab (CDF) and D{O} observe signals consistent with t{bar t} to WWb{bar b}, but inconsistent with the background prediction by 4.8{sigma} (CDF), 4.6a (D{O}). Additional evidence for the top quark Is provided by a peak in the reconstructed mass distribution. The kinematic properties of the excess events are consistent with the top quark decay. They measure the top quark mass to be 176{plus_minus}8(stat.){plus_minus}10(sys.) GeV/c{sup 2} (CDF), 199{sub -21}{sup+19}(stat.){plus_minus}22(sys.) GeV/c{sup 2} (D{O}), and the t{bar t} production cross section to be 6.8{sub -2.4}{sup+3.6}pb (CDF), 6.4{plus_minus}2.2 pb (D{O}).

Kim, S. B.

1995-08-00T23:59:59.000Z

86

Vorspann und Programm Berichte Vorspann und Programm Berichte  

E-Print Network (OSTI)

¨asident der Helmholtz-Gemeinschaft J¨urgen Mlynek. 6 #12;Vorwort Vorwort Das Deutsche Elektronen¨ur ein- zigartige Experimente zur Erforschung komplexer Sys- tem in Physik, Chemie, Biologie und anderen

87

Exposing the dressed quark's mass  

E-Print Network (OSTI)

This snapshot of recent progress in hadron physics made in connection with QCD's Dyson-Schwinger equations includes: a perspective on confinement and dynamical chiral symmetry breaking (DCSB); a pre'cis on the physics of in-hadron condensates; results on the hadron spectrum, including dressed-quark-core masses for the nucleon and Delta, their first radial excitations, and the parity-partners of these states; an illustration of the impact of DCSB on the electromagnetic pion form factor, thereby exemplifying how data can be used to chart the momentum-dependence of the dressed-quark mass function; and a prediction that F_1^{p,d}/F_1^{p,u} passes through zero at Q^2\\approx 5m_N^2 owing to the presence of nonpointlike scalar and axial-vector diquark correlations in the nucleon.

Roberts, H L L; Cloet, I C; Roberts, C D

2010-01-01T23:59:59.000Z

88

Atomwirtschaft und innere Sicherheit (Militar, Rustung, Sicherheit ...  

U.S. Energy Information Administration (EIA)

Atomwirtschaft und innere Sicherheit (Militar, Rustung, Sicherheit) (German Edition) on Amazon.com. *FREE* super saver shipping on qualifying offers.

89

FACH-Fachschaft Chemie und Wirtschaftschemie  

E-Print Network (OSTI)

FACH-Fachschaft Chemie und Wirtschaftschemie Ulm e.V. FACH-Fachschaft Chemie und Wirtschaftschemie: +49 731/50-22407 Fax: +49 731/50-22403 fs-chemie@uni-ulm.de Protokoll der 5. Mitgliederversammlung des FACH-Fachschaft Chemie und Wirtschaftschemie Ulm e.V. Sitzungsort: Universit¨at Ulm O27 131 Datum der

Pfeifer, Holger

90

Universitt Regensburg Fakultt Chemie und Pharmazie  

E-Print Network (OSTI)

Universität Regensburg Fakultät Chemie und Pharmazie http://www.chemie.uni-regensburg.de Module Chemie und Pharmazie http://www.chemie.uni-regensburg.de Module Catalogue Bachelor Chemistry 15.06.2011 1 Fakultät Chemie und Pharmazie http://www.chemie.uni-regensburg.de Module Catalogue Bachelor Chemistry 15

Schubart, Christoph

91

FACH-Fachschaft Chemie und Wirtschaftschemie  

E-Print Network (OSTI)

FACH-Fachschaft Chemie und Wirtschaftschemie Ulm e.V. FACH-Fachschaft Chemie und Wirtschaftschemie: +49 731/50-22407 Fax: +49 731/50-22403 fs-chemie@uni-ulm.de Protokoll der 3. Mitgliederversammlung des FACH Fachschaft Chemie und Wirtschaftschemie Ulm e.V. Sitzungsort: Universit¨at Ulm O27 131 Datum der

Pfeifer, Holger

92

Effective hadron theories from a quark model  

SciTech Connect

In the context of the quark exchange model of Lenz et al., effective hadron theories are constructed and the resulting physical observables compared to their ''experimental'' values as defined by the calculations using the exact quark model operators. This model study illustrates convergence issues for an effective hadron basis in a quark model in which all physical observables can be computed exactly.

Gardner, S.; Moniz, E.J.

1987-12-01T23:59:59.000Z

93

Top Quark Production at the Tevatron  

SciTech Connect

The top quark is the most recently discovered of the standard model quarks, and because of its very large mass, studies of the top quark and its interactions are important both as tests of the standard model and searches for new phenomena. In this document, recent results of analyses of top quark production, via both the electroweak and strong interactions, from the CDF and D0 experiments are presented. The results included here utilize a dataset corresponding to up to 6 fb{sup -1} of integrated luminosity, slightly more than half of the dataset recorded by each experiment before the Tevatron was shutdown in September 2011.

Mietlicki, David J.

2011-12-01T23:59:59.000Z

94

Single Top Quark Production at the Tevatron  

E-Print Network (OSTI)

While the heaviest known elementary particle, the top quark, has been discovered in 1995 by the CDF and D0 collaborations in ttbar events, it took 14 more years until the observation of single top quark production. In this article, we discuss recent studies of single top quark production by the CDF and D0 collaborations at the Tevatron. In particular, we present the measurement of single top quark s- and t-channel production combined, the first observation of t-channel production, the simultaneous measurement of s- and t-channel production cross sections as well as the extraction of the CMK matrix element |Vtb}|.

Yvonne Peters; for the CDF; D0 Collaborations

2012-10-26T23:59:59.000Z

95

Top quark spin and $Htb$ interaction in charged Higgs and top quark associated production at LHC  

E-Print Network (OSTI)

We study the charged Higgs production at LHC via its associated production with top quark. The kinematic cuts are optimized to suppress the background processes so that the reconstruction of the charged Higgs and top quark is possible. The angular distributions with respect to top quark spin are explored to study the $Htb$ interaction at LHC.

Xue Gong; Zong-Guo Si; Shuo Yang; Ya-juan Zheng

2012-10-29T23:59:59.000Z

96

Prfungs-und Studienordnung der Ludwig-Maximilians-Universitt Mnchen  

E-Print Network (OSTI)

Fähigkeiten. § 2 Akademischer Grad Die Fakultät für Chemie und Pharmazie verleiht denjenigen, die diesen Module in Deutsch (Anlage 1/Spalte I und Anla- ge 2/Spalte 5) und Englisch (Anlage 1/Spalte I), 7. die Beschreibungen (Inhalt und Lernziele) der Module in Deutsch und Englisch (Anlage 1/Spalte II), 8. der

Kersting, Roland

97

Hormann Energie und Umwelt | Open Energy Information  

Open Energy Info (EERE)

Hormann Energie und Umwelt Hormann Energie und Umwelt Jump to: navigation, search Name Hormann Energie und Umwelt Place Munchen, Germany Sector Geothermal energy Product Munchen-based energy and environmental technology division involved in geothermal power. References Hormann Energie und Umwelt[1] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. Hormann Energie und Umwelt is a company located in Munchen, Germany . References ↑ "Hormann Energie und Umwelt" Retrieved from "http://en.openei.org/w/index.php?title=Hormann_Energie_und_Umwelt&oldid=346606" Categories: Clean Energy Organizations Companies Organizations Stubs What links here Related changes Special pages Printable version

98

Static quark free energies at finite temperature with two flavors of improved Wilson quarks  

E-Print Network (OSTI)

Polyakov loop correlations at finite temperature in two-flavor QCD are studied in lattice simulations with the RG-improved gluon action and the clover-improved Wilson quark action. From the simulations on a $16^3 \\times 4$ lattice, we extract the free energies, the effective running coupling $g_{\\rm eff}(T)$ and the Debye screening mass $m_D(T)$ for various color channels of heavy quark--quark and quark--anti-quark pairs above the critical temperature. The free energies are well approximated by the screened Coulomb form with the appropriate Casimir factors. The magnitude and the temperature dependence of the Debye mass are compared to those of the next-to-leading order thermal perturbation theory and to a phenomenological formula given in terms of $g_{\\rm eff}(T)$. Also we made a comparison between our results with the Wilson quark and those with the staggered quark previously reported.

Y. Maezawa; S. Ejiri; T. Hatsuda; N. Ishii; N. Ukita; S. Aoki; K. Kanaya

2006-10-02T23:59:59.000Z

99

Heavy quark thermodynamics in full QCD  

E-Print Network (OSTI)

We analyze the large-distance behaviour of static quark-anti-quark pair correlations in QCD. The singlet free energy is calculated and the entropy contribution to it is identified allowing us to calculate the excess internal energy. The free energy has a sharp drop in the critical region, leading to sharp peaks in both excess entropy and internal energy.

Konstantin Petrov; RBC-Bielefeld Collaboration

2007-01-22T23:59:59.000Z

100

The Particle Adventure | What holds it together? | Quark confinement  

NLE Websites -- All DOE Office Websites (Extended Search)

Quark confinement Quark confinement Quark confinement Color-charged particles cannot be found individually. For this reason, the color-charged quarks are confined in groups (hadrons) with other quarks. These composites are color neutral. The development of the Standard Model's theory of the strong interactions reflected evidence that quarks combine only into baryons (three quark objects), and mesons (quark-antiquark objects), but not, for example, four-quark objects. Now we understand that only baryons (three different colors) and mesons (color and anticolor) are color-neutral. Particles such as ud or uddd that cannot be combined into color-neutral states are never observed. Color-Force Field The quarks in a given hadron madly exchange gluons. For this reason, physicists talk about the color-force field which consists of the gluons holding the bunch of quarks together.

Note: This page contains sample records for the topic "quarks und leptonen" 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

The Particle Adventure | What holds it together? | Quarks emit gluons  

NLE Websites -- All DOE Office Websites (Extended Search)

holds it together? > Quarks emit gluons holds it together? > Quarks emit gluons Quarks emit gluons Color charge is always conserved. When a quark emits or absorbs a gluon, that quark's color must change in order to conserve color charge. For example, suppose a red quark changes into a blue quark and emits a red/antiblue gluon (the image below illustrates antiblue as yellow). The net color is still red. This is because - after the emission of the gluon - the blue color of the quark cancels with the antiblue color of the gluon. The remaining color then is the red color of the gluon. Quarks emit and absorb gluons very frequently within a hadron, so there is no way to observe the color of an individual quark. Within a hadron, though, the color of the two quarks exchanging a gluon will change in a way that keeps the bound system in a color-neutral state.

102

CONCIERGE-SERVICE ANGEBOTE UND LEISTUNGEN DES CONCIERGE-SERVICE  

E-Print Network (OSTI)

alle haushaltsnahen und handwerklichen Bereiche rund um Haus und Garten. Das sind insbesondere: Boten. Beratung ­ Wir sind Ansprechpartner für alle Fragen rund um Haus und Garten. Transparenz ­ Wir

Heermann, Dieter W.

103

BOOK REVIEW: Fruleins und GIs, by Annette Brauerhoch  

E-Print Network (OSTI)

Brauerhoch. Fruleins und GIs. Frankfurt am Main und Basel:Identity. 1 In Fruleins und GIs, Brauerhoch wishes toin the topic of Fruleins and GIs in the immediate postwar

Layne, Priscilla D

2007-01-01T23:59:59.000Z

104

QUARK MATTER IN MASSIVE COMPACT STARS  

SciTech Connect

The recent observation of the pulsar PSR J1614-2230 with a mass of 1.97 {+-} 0.04 M{sub sun} gives a strong constraint on the quark and nuclear matter equations of state (EoS). We explore the parameter ranges for a parameterized EoS for quark stars. We find that strange stars, made of absolutely stable strange quark matter, comply with the new constraint only if effects from the strong coupling constant and color-superconductivity are taken into account. Hybrid stars, compact stars with a quark matter core and a hadronic outer layer, can be as massive as 2 M{sub sun}, but only for a significantly limited range of parameters. We demonstrate that the appearance of quark matter in massive stars crucially depends on the stiffness of the nuclear matter EoS. We show that the masses of hybrid stars stay below the ones of hadronic and pure quark stars, due to the softening of the EoS at the quark-hadron phase transition.

Weissenborn, Simon; Pagliara, Giuseppe; Schaffner-Bielich, Juergen [Institute for Theoretical Physics, Ruprecht-Karls University, 69120 Heidelberg (Germany); Sagert, Irina [Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824 (United States); Hempel, Matthias [Department of Physics, University of Basel, 4056 Basel (Switzerland)

2011-10-10T23:59:59.000Z

105

Untersuchungen zur Rolle der Cathepsine S und X in Maus- und Zellkulturmodellen fr neuronalen Zelltod und Inflammation.  

E-Print Network (OSTI)

??Im Rahmen dieser Dissertation wurde die Beteiligung der lysosomalen Cysteinpeptidasen Cathepsin X und S in inflammatorischen Prozessen, die zu neuronalem Zelltod beitragen, untersucht. Fr Cathepsin (more)

Wendt, Wiebke

2007-01-01T23:59:59.000Z

106

Dritte Satzung zur nderung der Prfungsordnung fr die Bachelor-und Masterstudiengnge Chemie und Molecular Science  

E-Print Network (OSTI)

Dritte Satzung zur ?nderung der Prüfungsordnung für die Bachelor- und Masterstudiengänge Chemie und Masterstudiengänge Chemie und Molecular Science der Universität Erlangen-Nürnberg vom 28. November 2006, zuletzt Grundphase" ersetzt. b) Satz 1 erhält folgende Fassung: ,,1 Die Grundphase des Bachelorstudiums Chemie

Fiebig, Peter

107

Programm "Wasser fr Mensch und Natur" Familien-und KinderUni-Mitmachtag im Botanischen Garten  

E-Print Network (OSTI)

Programm "Wasser für Mensch und Natur" Familien- und KinderUni-Mitmachtag im Botanischen Garten der Schule im Botanischen Garten untersucht werden. Aber auch die Pflanzen an Land benötigen ganz des Familien- und KinderUni- Mitmachtags am 9. Juni 2013 im Botanischen Garten der Johannes Gutenberg

Esper, Jan

108

Singlet Free Energies of a Static Quark-Antiquark Pair  

E-Print Network (OSTI)

We study the singlet part of the free energy of a static quark anti-quark pair at finite temperature in three flavor QCD with degenerate quark masses using $N_{\\tau}=4$ and 6 lattices with Asqtad staggered fermion action. We look at thermodynamics of the system around phase transition and study its scaling with lattice spacing and quark masses.

Konstantin Petrov

2004-09-01T23:59:59.000Z

109

Quark masses from lattice QCD and the study of textures  

E-Print Network (OSTI)

I review how the determination of quark masses from lattice QCD can be used to study textures in quark mass matrices. This type of theory relates quark masses to CKM matrix elements. I demonstrate how the recent precision results from the HPQCD and MILC collaborations for quark masses can be used to test some of these ideas.

Craig McNeile

2010-04-28T23:59:59.000Z

110

Active QuarkNet Centers  

NLE Websites -- All DOE Office Websites (Extended Search)

first active year) first active year)       QuarkNet Home - Information - Calendar - Contacts - Projects - Forms: EoI - Teachers Institution Contact e-mail Year Brown, Northeastern & Brandeis Universities Richard Dower - rick.dower@roxburylatin.org 1999 Fermilab & University of Chicago Chris Stoughton - stoughto@fnal.gov 1999 Florida State University Horst Wahl - wahl@hep.fsu.edu 1999 Indiana University Rick Van Kooten - rickv@paoli.physics.indiana.edu 1999 University of California - Santa Cruz Steve Ritz - ritz@scipp.ucsc.edu 1999 University of Notre Dame Dan Karmgard - Karmgard.1@nd.edu 1999 University of Oklahoma Michael Strauss - strauss@mail.nhn.ou.edu 1999 University of Rochester Kevin McFarland - ksmcf@pas.rochester.edu 1999

111

Single top quark production at D0  

SciTech Connect

Updates of electroweak single top quark production measurements by the D0 collaboration are presented using 5.4 fb{sup -1} of proton-antiproton collision data from the Tevatron at Fermilab. Measurements of the t-channel, s-channel and combined single top quark production cross section are presented, including an updated lower limit on the CKM matrix element |V{sub tb}|. Also reported are results from searches for gluon-quark flavor-changing neutral currents and W' boson production.

Schwienhorst, Reinhard; /Michigan State U.

2011-09-01T23:59:59.000Z

112

Auswirkungen von Basisinnovationen auf die Energiewirtschaft und die Energienachfrage in Deutschland : am Beispiel der Nano- und Biotechnologie.  

E-Print Network (OSTI)

??Die Bedeutung einer nachhaltigen Energieversorgung steigt aufgrund des globalen Klimawandels und vor dem Hintergrund endlicher Ressourcen stetig an. In diesem Zusammenhang gewinnen neue Innovationen und (more)

Lambauer, Jochen

2013-01-01T23:59:59.000Z

113

Universitt Bern Departement fr Chemie und  

E-Print Network (OSTI)

Kontakt Universität Bern Departement für Chemie und Biochemie Freiestrasse 3, 3012 Bern 031 631 42:45 DNA Harddisk des Lebens 10:00 ­ 10:30 Berufsbild (Bio)Chemie 10:45 ­ 11:15 Eine Reise in die Welt des) 14:00 Trio Daniel Woodtli im Wandel der Zeit Grosser Hörsaal U113 und Foyer Cafeteria U1 Chemie und

Mühlemann, Oliver

114

Quark-antiquark potential to order 1/m and heavy quark masses  

SciTech Connect

An updated heavy quark-antiquark potential is constructed by matching the short-distance perturbative part to long-distance lattice QCD results at an intermediate r scale. The static potential and the order 1/m potential are both analyzed in this way. Effects of order 1/m in charmonium and bottomonium spectra are discussed in comparison. Charm and bottom quark masses are deduced from the spectra and related to the quark masses of other schemes.

Laschka, Alexander; Kaiser, Norbert; Weise, Wolfram [Physik Department, Technische Universitaet Muenchen, D-85747 Garching (Germany)

2011-05-01T23:59:59.000Z

115

Lebenszyklusanalyse fossiler, nuklearer und regenerativer Stromerzeugungstechniken.  

E-Print Network (OSTI)

??Die Verfgbarkeit von elektrischer Nutzenergie hat in vielen Bereichen dazu beigetragen, die Lebensqualitt der Menschen zu verbessern und sowohl natrliche als auch zivilisatorische Risiken zu (more)

Marheineke, Torsten

2002-01-01T23:59:59.000Z

116

Matching heavy-light currents with NRQCD and HISQ quarks  

E-Print Network (OSTI)

We calculate the one loop renormalisation parameters for the heavy-light axial-vector and vector currents using lattice perturbation theory. We use NonRelativistic QCD (NRQCD) heavy quarks and the Highly Improved Staggered Quark (HISQ) action for the light quarks. We present results for heavy-light currents with massless HISQ quarks and briefly discuss the extension to heavy-heavy currents with massive HISQ quarks.

Christopher Monahan; Christine Davies; Ron Horgan; G. Peter Lepage; Heechang Na; Junko Shigemitsu

2012-10-25T23:59:59.000Z

117

History of exotic Meson (4-quark) and Baryon (5-quark) States  

E-Print Network (OSTI)

I briefly review the history of exotic meson (4-quark) and baryon (5-quark) states, which is rooted in the formalism of Regge pole and duality. There are robust model-independent predictions for the exchange of 4-quark (Baryonium) Regge trajectories in several processes, which are strongly supported by experiment. On the other hand the predictions for the spectroscopy of 4-quark resonances are based on specific QCD inspired models, with some experimental support. The corresponding predictions for the recently discovered exotic baryon (Pentaquark) state are briefly discussed.

D. P. Roy

2003-11-17T23:59:59.000Z

118

Heavy quark production from jet conversions in a quark-gluon plasma  

E-Print Network (OSTI)

Recently, it has been demonstrated that the chemical composition of jets in heavy ion collisions is significantly altered compared to the jets in the vacuum. This signal can be used to probe the medium formed in nuclear collisions. In this study we investigate the possibility that fast light quarks and gluons can convert to heavy quarks when passing through a quark-gluon plasma. We study the rate of light to heavy jet conversions in a consistent Fokker-Planck framework and investigate their impact on the production of high-p(T) charm and bottom quarks at the Relativistic Heavy Ion Collider and the Large Hadron Collider.

Liu, W.; Fries, Rainer J.

2008-01-01T23:59:59.000Z

119

Press Pass - Press Release - Single top quark  

NLE Websites -- All DOE Office Websites (Extended Search)

9-04 9-04 March 9, 2009 For immediate release Media Contacts: Judy Jackson, Fermilab, +1-630-840-3351, jjackson@fnal.gov Kurt Riesselmann, Fermilab, +1-630-840-3351, kurtr@fnal.gov Graphics and photos are available at: http://www.fnal.gov/pub/presspass/images/Single-Top-Quark-2009.html Fermilab collider experiments discover rare single top quark Batavia, Ill.-Scientists of the CDF and DZero collaborations at the Department of Energy's Fermi National Accelerator Laboratory have observed particle collisions that produce single top quarks. The discovery of the single top confirms important parameters of particle physics, including the total number of quarks, and has significance for the ongoing search for the Higgs particle at Fermilab's Tevatron, currently the world's most powerful operating particle accelerator.

120

quarks_q000-web.dvi  

NLE Websites -- All DOE Office Websites (Extended Search)

- 1- QUARK MASSES Updated Jan 2012 by A.V. Manohar (University of California, San Diego) and C.T. Sachrajda (University of Southampton) A. Introduction This note discusses some of...

Note: This page contains sample records for the topic "quarks und leptonen" 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.


121

Quark matter conductivity in strong magnetic background  

SciTech Connect

Applying the ideas and methods of condensed matter physics we calculate the quantum conductivity of quark matter in magnetic field. In strong field quantum conductivity is proportional to the square root of the field.

Kerbikov, B. O., E-mail: borisk@itep.ru [Institute for Theoretical and Experimental Physics (Russian Federation)

2012-06-15T23:59:59.000Z

122

Y scaling in a simple quark model  

SciTech Connect

A simple quark model is used to define a nuclear pair model, that is, two composite hadrons interacting only through quark interchange and bound in an overall potential. An equivalent hadron model is developed, displaying an effective hadron-hadron interaction which is strongly repulsive. We compare the effective hadron model results with the exact quark model observables in the kinematic region of large momentum transfer, small energy transfer. The nucleon response function in this y-scaling region is, within the traditional framework, sensitive to the nucleon momentum distribution at large momentum. We find a surprisingly small effect of hadron substructure. Furthermore, we find in our model that a simple parametrization of modified hadron size in the bound state, motivated by the bound quark momentum distribution, is not a useful way to correlate different observables.

Kumano, S.; Moniz, E.J.

1988-05-01T23:59:59.000Z

123

Commissioning ATLAS and CMS with top quarks  

E-Print Network (OSTI)

The large ttbar production cross-section at the LHC suggests the use of top quark decays to calibrate several critical parts of the detectors, such as the trigger system, the jet energy scale and b-tagging.

B. S. Acharya; F. Cavallari; G. Corcella; R. Di Sipio; G. Petrucciani

2008-05-25T23:59:59.000Z

124

The crystallography of three flavor quark matter  

E-Print Network (OSTI)

The nature of cold three-flavor quark matter at the large (but not asymptotic) densities relevant to neutron star phenomenology is not resolved. The gapless CFL phase, which was previously believed to have the lowest free ...

Sharma, Rishi, Ph. D. Massachusetts Institute of Technology

2007-01-01T23:59:59.000Z

125

Stability windows for proto-quark stars  

E-Print Network (OSTI)

We investigate the existence of possible stable strange matter and related stability windows at finite temperature for different models that are generally applied to describe quark stars, namely, the quark-mass density dependent model, the MIT bag model and the Nambu-Jona-Lasinio model. We emphasize that, although the limits for stable strange matter depend on a comparison with the ground state of 56Fe, which is a zero temperature state, the quantity that has to be used in the search for strange matter in proto-quark stars is the free energy and we analyze stability windows up to temperatures of the order of 40 MeV. The effects of strong magnetic fields on stability windows are computed and the resulting mass-radius relations for different stages of the proto-quark star are analyzed.

V. Dexheimer; J. R. Torres; D. P. Menezes

2013-03-20T23:59:59.000Z

126

Evidence for production of single top quarks  

SciTech Connect

We present first evidence for the production of single top quarks in the D0 detector at the Fermilab Tevatron p{bar p} collider. The standard model predicts that the electroweak interaction can produce a top quark together with an antibottom quark or light quark, without the antiparticle top quark partner that is always produced from strong coupling processes. Top quarks were first observed in pair production in 1995, and since then, single top quark production has been searched for in ever larger datasets. In this analysis, we select events from a 0.9 fb{sup -1} dataset that have an electron or muon and missing transverse energy from the decay of a W boson from the top quark decay, and two, three, or four jets, with one or two of the jets identified as originating from a b hadron decay. The selected events are mostly backgrounds such as W+jets and t{bar t} events, which we separate from the expected signals using three multivariate analysis techniques: boosted decision trees, Bayesian neural networks, and matrix element calculations. A binned likelihood fit of the signal cross section plus background to the data from the combination of the results from the three analysis methods gives a cross section for single top quark production of {sigma}(p{bar p} {yields} tb + X, tqb + X) = 4.7 {+-} 1.3 pb. The probability to measure a cross section at this value or higher in the absence of signal is 0.014%, corresponding to a 3.6 standard deviation significance. The measured cross section value is compatible at the 10% level with the standard model prediction for electroweak top quark production. We use the cross section measurement to directly determine the Cabibbo-Kobayashi-Maskawa quark mixing matrix element that describes the Wtb coupling and find |V{sub tb}f{sub 1}{sup L}| = 1.31{sub -0.21}{sup +0.25}, where f{sub 1}{sup L} is a generic vector coupling. This model-independent measurement translates into 0.68 < |V{sub tb}| {le} 1 at the 95% C.L. in the standard model.

Abazov, V.M.; /Dubna, JINR; Abbott, B.; /Oklahoma U.; Abolins, M.; /Michigan State U.; Acharya, B.S.; /Tata Inst.; Adams, M.; /Illinois U., Chicago; Adams, T.; /Florida State U.; Aguilo, E.; /Simon Fraser U.; Ahn, S.H.; /Korea U., KODEL; Ahsan, M.; /Kansas State U.; Alexeev, G.D.; /Dubna, JINR; Alkhazov, G.; /St. Petersburg, INP /Michigan U.

2008-03-01T23:59:59.000Z

127

Hunting the Quark Gluon Plasma ASSESSMENTS  

NLE Websites -- All DOE Office Websites (Extended Search)

Hunting the Quark Gluon Plasma Hunting the Quark Gluon Plasma ASSESSMENTS BY THE EXPERIMENTAL COLLABORATIONS Relativistic Heavy Ion Collider (RHIC) * Brookhaven National Laboratory, Upton, NY 11974-5000 RESULTS FROM THE FIRST 3 YEARS AT RHIC managed for the U.S. Department of Energy by Brookhaven Science Associates, a company founded by Stony Brook University and Battelle April 18, 2005 BNL -73847-2005 Formal Report

128

Light quark physics from lattice QCD  

E-Print Network (OSTI)

I review lattice calculations of quantities that involve light quarks, including light quark masses, the vector form factor f_+(0) needed for semileptonic kaon decays, and kaon mixing. Results for most of these quantities are now available from multiple groups. Averages of these results are presented, along with a discussion of the methodology behind the averaging procedure. Recent progress in calculations of K->pi pi matrix elements is also reviewed.

Jack Laiho

2011-06-02T23:59:59.000Z

129

Single top quark measurements with CMS  

E-Print Network (OSTI)

Measurements of single top quark production are presented, performed using CMS data collected in 2011 and 2012 at centre-of-mass energies of 7 and 8 TeV. The cross sections for the electroweak production of single top quarks in the t-channel and in association with W-bosons is measured and the results are used to place constraints on the CKM matrix element |V_tb|.

Jeannine Wagner-Kuhr

2013-02-18T23:59:59.000Z

130

Triangular mass matrices for quarks and leptons  

E-Print Network (OSTI)

We assume that all quark and lepton $3 \\times 3$ mass matrices which appear in the standard model lagrangian (after spontaneous symmetry breaking) with neutrinos treated as Dirac patricles have the triangular form. Such matrices have not only less non-zero elements (three of them are equal to zero) but also lead to very asymmetrical decomposition into one diagonal and two unitary matrices for quarks and leptons. We also assume that unitary matrices which transform flavor into definite mass states for right handed components (weakly non-interacting) in the same weak isodoublet are equal. Using all available experimental data on quark and lepton masses and mixing angles, treating in the universal way quarks and leptons, we determine the triangular mass matrices for up and down type quarks, neutrinos and charged leptons and as a consequence mixing matrices for left-handed and right handed components. As the result of the fit we get predictions for the neutrino masses including smallest neutrino mass. The calculations without CP violation and with inclusion of this effect in quark sector are also presented.

S. Tatur; J. Bartelski

2006-05-24T23:59:59.000Z

131

Studienjahr 2012/2013 Psychosomatische Medizin und Psychotherapie  

E-Print Network (OSTI)

(Hrsg.) (2006). Psychosomatische Medizin und Psychotherapie. Springer Verlag (online verfügbar an der

Manstein, Dietmar J.

132

Organigramm 10 Organe der Stiftung und weitere Gremien 11  

E-Print Network (OSTI)

;Vorwort Vorwort Das Deutsche Elektronen-Synchrotron DESY ist ein Zentrum der Helmholtz Gemeinschaft mit den Gebieten der Physik, Biologie, Chemie und Kristallographie, in den Material- und Geowis, die Bundesrepublik Deutsch- land und die Freie und Hansestadt Hamburg, stellten DESY im Jahr 2001

133

1. nationaler Kongress der erneuerbaren Energien und Energieeffizienz  

E-Print Network (OSTI)

Smartgrid. Das intelligente Netz. Energiezukunft; in Zukunft Strom Gasnetz: Gegenwart und Zukunft Neue

Richner, Heinz

134

Lageplan und Anreise ETH Zrich, Hauptgebude, Rmistrasse 101, 8092 Zrich  

E-Print Network (OSTI)

von Land- wirtschaft,Trinkwasserversorgung, Industrie und Energiewirtschaft erhöhen den Druck auf die

135

Phase transition from hadronic matter to quark matter  

Science Conference Proceedings (OSTI)

We study the phase transition from nuclear matter to quark matter within the SU(3) quark mean field model and NJL model. The SU(3) quark mean field model is used to give the equation of state for nuclear matter, while the equation of state for color superconducting quark matter is calculated within the NJL model. It is found that at low temperature, the phase transition from nuclear to color superconducting quark matter will take place when the density is of order 2.5?0 - 5?0. At zero density, the quark phase will appear when the temperature is larger than about 148 MeV. The phase transition from nuclear matter to quark matter is always first order, whereas the transition between color superconducting quark matter and normal quark matter is second order.

P. Wang; A.W. Thomas; A.G. Williams

2007-04-01T23:59:59.000Z

136

MHH Forschungsbericht 2004632 Abteilung Epidemiologie, Sozialmedizin und  

E-Print Network (OSTI)

. Managed Care. Neue Wege im Gesundheitsmanage- ment. Wiesbaden: Gabler, 2004. Dierks ML, Koppelin F (Hrsg, Koppelin F (Hrsg.). Public Health Ausbil- dungsprofile und Berufsperspektiven in Deutschland Hochschule Hannover ­ ,,frü- he" und ,,späte" Jahrgänge im Vergleich. In: Dierks ML, Koppelin F (Hrsg

Manstein, Dietmar J.

137

Dieser Flyer ist Teil der ffentlichkeitsarbeit des Bundesministeriums fr Bildung und Forschung; er wird kostenlos abgegeben und ist nicht  

E-Print Network (OSTI)

Wissenschaftssystem Podiumsdiskussion mit Prof. Dr. Petra Denk, Professur für Betriebs- und Energiewirtschaft

Siegen, Universität

138

Dragging Heavy Quarks in Quark Gluon Plasma at the Large Hadron Collider  

E-Print Network (OSTI)

The drag and diffusion coefficients of charm and bottom quarks propagating through quark gluon plasma (QGP) have been evaluated for conditions relevant to nuclear collisions at Large Hadron Collider (LHC). The dead cone and Landau-Pomeronchuk-Migdal (LPM) effects on radiative energy loss of heavy quarks have been considered. Both radiative and collisional processes of energy loss are included in the {\\it effective} drag and diffusion coefficients. With these effective transport coefficients we solve the Fokker Plank (FP) equation for the heavy quarks executing Brownian motion in the QGP. The solution of the FP equation has been used to evaluate the nuclear suppression factor, $R_{\\mathrm AA}$ for the non-photonic single electron spectra resulting from the semi-leptonic decays of hadrons containing charm and bottom quarks. The effects of mass on $R_{\\mathrm AA}$ has also been highlighted.

Santosh K Das; Jan-e Alam; Payal Mohanty

2010-03-29T23:59:59.000Z

139

Measurements of top quark properties at the Tevatron collider  

Science Conference Proceedings (OSTI)

The discovery of the top quark in 1995 opened a whole new sector of investigation of the Standard Model; today top quark physics remains a key priority of the Tevatron program. Some of the measurements of top quark properties, for example its mass, will be a long-standing legacy. The recent evidence of an anomalously large charge asymmetry in top quark events suggests that new physics could couple preferably with top quarks. I will summarize this long chapter of particle physics history and discuss the road the top quark is highlighting for the LHC program.

Margaroli, Fabrizio

2011-05-01T23:59:59.000Z

140

Nonperturbative results on the quark-gluon vertex  

E-Print Network (OSTI)

We present analytical and numerical results for the Dirac form factor of the quark-gluon vertex in the quark symmetric limit, where the incoming and outgoing quark momenta have the same magnitude but opposite sign. To accomplish this, we compute the relevant components of the quark-ghost scattering kernel at the one-loop dressed approximation, using as basic ingredients the full quark propagator, obtained as a solution of the quark gap equation, and the gluon propagator and ghost dressing function, obtained from large-volume lattice simulations.

A. C. Aguilar; D. Binosi; J. C. Cardona; J. Papavassiliou

2013-01-17T23:59:59.000Z

Note: This page contains sample records for the topic "quarks und leptonen" 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.


141

Questions and Answers - What is the charge of an up quark and the charge of  

NLE Websites -- All DOE Office Websites (Extended Search)

What kinds of quarks are inprotons and neutrons? What kinds of quarks are in<br>protons and neutrons? Previous Question (What kinds of quarks are in protons and neutrons?) Questions and Answers Main Index Next Question (Are quarks confineable for study?) Are quarks confineable for study? What is the charge of an up quark and the charge of a down quark? How many quarks make up a proton and a neutron? Protons and neutrons are each composed of three quarks. Protons are made up of two 'up' quarks and one 'down' quark while neutrons are made up of two 'down' quarks and one 'up' quark. Quarks carry fractional electrical charges. An 'up' quark has a charge of +2/3 and a 'down' quark has a charge of -1/3. Is this consistent with what we know about protons and neutrons? Remember that protons carry an electrical charge of +1 while neutrons carry no electrical charge. We said

142

Advances in Quark Gluon Plasma  

E-Print Network (OSTI)

In the last 20 years, heavy-ion collisions have been a unique way to study the hadronic matter in the laboratory. Its phase diagram remains unknown, although many experimental and theoretical studies have been undertaken in the last decades. The Relativistic Heavy Ion Collider (RHIC) at BNL was the first ever built heavy-ion collider. RHIC delivered its first collisions in June 2000 boosting the heavy-ion community. Impressive amount of experimental results has been obtained. In November 2010, the Large Hadron Collider (LHC) at CERN delivered lead-lead collisions at unprecedented center-of-mass energies, 14 times larger than that at RHIC. Needless to say that the heavy-ion programs at RHIC and LHC promise fascinating and exciting results in the next decade. In the second part, a historical approach will be adopted, starting with the notion of limiting temperature of matter introduced by Hagedorn in the 60's and the discovery of the QCD asymptotic freedom in the 70's. The phase diagram of hadronic matter, conceived as nowadays, will be shown together with the most important predictions of lattice QCD calculations at finite temperature. In the third part, the heavy-ion collisions at ultra-relativistic energies will be proposed as a unique experimental method to study QGP in the laboratory, as suggested by the Bjorken model. In the last part of these lectures, I will present my biased review of the numerous experimental results obtained in the last decade at RHIC which lead to the concept of strong interacting QGP, and the first results obtained at LHC with the 2010 and 2011 PbPb runs. Finally, the last section is devoted to refer to other lectures about quark gluon plasma and heavy ion physics.

Gines Martinez

2013-04-04T23:59:59.000Z

143

edited1_TopQuarkMass  

NLE Websites -- All DOE Office Websites (Extended Search)

CALCULATE THE TOP QUARK MASS CALCULATE THE TOP QUARK MASS TEACHER NOTES DESCRIPTION Students use momentum conservation, energy conservation and two-dimensional vector addition to calculate the mass of the heaviest of the six known quarks. They gather data from data plots from the DØ experiment at Fermilab. The events were chosen carefully; all of the decay products moved in a plane perpendicular to the beam. This makes the vector addition much simpler. STANDARDS National Science Education Standards (U.S. National Research Council) * Physical Science Content Standard B: As a result of this activity . . . students should develop an understanding of: o Conservation of energy and increase in disorder. o Interactions in energy and matter. LEARNING OBJECTIVES Students will know and be able to:

144

Bulk viscosity in nuclear and quark matter: A short review  

E-Print Network (OSTI)

The history and recent progresses in the study of bulk viscosity in nuclear and quark matter are reviewed. The constraints from baryon number conservation and electric neutrality in quark matter on particle densities and fluid velocity divergences are discussed.

Hui Dong; Nan Su; Qun Wang

2007-02-07T23:59:59.000Z

145

String Approach to QCD Quarks in Fundamental Representations  

E-Print Network (OSTI)

Straightforward use of AdS/CFT correspondence can give QCD with quarks in adjoint representations. Using an asymmetric orbifold approach we obtain nonsupersymmetric QCD with four quark flavors in fundamental representations of color.

Paul H. Frampton

2004-07-12T23:59:59.000Z

146

Debye mass and heavy quark potential in a PNJL quark plasma  

SciTech Connect

We calculate the Debye mass for the screening of the heavy quark potential in a plasma of massless quarks coupled to the temporal gluon background governed by the Polyakov loop potential within the PNJL model in RPA approximation. We give a physical motivation for a recent phenomenological fit of lattice data by applying the calculated Debye mass with its suppression in the confined phase due to the Polyakov loop to a description of the temperature dependence of the singlet free energy for QCD with a heavy quark pair at infinite separation. We compare the result to lattice data.

Jankowski, J., E-mail: jakubj@ift.uni.wroc.pl; Blaschke, D., E-mail: blaschke@ift.uni.wroc.pl [University of Wroclaw, Institute for Theoretical Physics (Poland)

2012-07-15T23:59:59.000Z

147

Cold quark matter, quadratic corrections, and gauge/string duality  

Science Conference Proceedings (OSTI)

We make an estimate of the quadratic correction in the pressure of cold quark matter using gauge/string duality.

Andreev, Oleg [Arnold Sommerfeld Center for Theoretical Physics, LMU-Muenchen, Theresienstrasse 37, 80333 Muenchen (Germany)

2010-04-15T23:59:59.000Z

148

Improved Wilson QCD simulations with light quark masses  

E-Print Network (OSTI)

We present results from simulations using 2 flavours of O(a)-improved Wilson quarks whose masses are about 1/3 of the physical strange quark mass. We present new data on the mass of the singlet pseudoscalar meson and evidence of the onset of chiral logarithms in the pion decay constant. The previously observed suppression of the topological susceptibility at lighter quark masses is confirmed. We report on the performance of the hybrid Monte Carlo algorithm at light quark masses.

CR Allton; A Hart; D Hepburn; AC Irving; B Joo; C McNeile; C Michael; SV Wright

2004-03-04T23:59:59.000Z

149

Top Quark Mass Measurements at the Tevatron  

SciTech Connect

We report the latest results on the top-quark mass and on the top-antitop mass difference from the CDF and D0 collaborations using data collected at the Fermilab Tevatron p{bar p} collider at {radical}s = 1.96 TeV. We discuss general issues in top-quark mass measurements and present new results from direct measurements and from top-pair production cross-section. We also report new results on the top-antitop mass difference.

Ye, Zhenyu; /Fermilab

2011-07-01T23:59:59.000Z

150

Determination of intrinsic transverse momentum of quarks  

SciTech Connect

It is suggested that the observed universality of the transverse momentum squared distribution for the meson resonances eta, rho, ..omega.., f and K* in soft hadron-hadron interactions arises because they are dominantly produced as a result of quark-antiquark fusion (recombination). The universal value of the slope parameter is then interpreted as due to the intrinsic transverse momentum (k/sub T/) of the quarks which yields the values < k/sub T/ > /sub q/ = 0.36 +- 0.01 GeV/c and < k/sub T//sup 2/ > /sub q/ = 0.16 +- 0.01 (GeV/c)/sup 2/.

Malhotra, P.K.; Orava, R.

1982-11-01T23:59:59.000Z

151

Quark and Gluon Condensates in Isospin Matter  

E-Print Network (OSTI)

Applying the Hellmann-Feynman theorem to a charged pion gas, the quark and gluon condensates at low isospin density are determined by precise pion properties. At intermediate density around $ f_\\pi^2m_\\pi$, from both the estimation for the dilute pion gas and the calculation with Nambu--Jona-Lasinio model, the quark condensate is strongly and monotonously suppressed, while the gluon condensate is enhanced and can be larger than its vacuum value. This unusual behavior of the gluon condensate is universal for Bose condensed matter of mesons. Our results can be tested by lattice calculations at finite isospin density.

Lianyi He; Yin Jiang; Pengfei Zhuang

2008-12-01T23:59:59.000Z

152

Quark mass thresholds in QCD thermodynamics  

E-Print Network (OSTI)

We discuss radiative corrections to how quark mass thresholds are crossed, as a function of the temperature, in basic thermodynamic observables such as the pressure, the energy and entropy densities, and the heat capacity of high temperature QCD. The indication from leading order that the charm quark plays a visible role at surprisingly low temperatures, is confirmed. We also sketch a way to obtain phenomenological estimates relevant for generic expansion rate computations at temperatures between the QCD and electroweak scales, pointing out where improvements over the current knowledge are particularly welcome.

M. Laine; Y. Schroder

2006-03-06T23:59:59.000Z

153

Top Quark Physics at the LHC  

E-Print Network (OSTI)

An overview of the prospects of top quark physics at the LHC is presented. The ATLAS and the CMS detectors are about to produce a large amount of data with high top quark contents from the LHC proton-proton collisions. A wide variet y of physics analyses is planned in both experiments, and a number of useful insights have already been obtained regarding their detector performance and physics potential. This summary is based on the talk presented at the Hadron C ollider Physics Symposium 2008, Galena, Illinois, May 27-31, 2008.

Akira Shibata

2008-07-31T23:59:59.000Z

154

Statistisches Bundesamt VIB/32134000 und VIB/32135100  

E-Print Network (OSTI)

und Gôa 437 Indonesien, einschl. Irian Jaya 195 Insel Man 438 Irak 439 Iran, Islamische Republik 437 Irian Jaya, zu Indonesien 135 Irland (ohne Nordirland) 136 Island 441 Israel 137 Italien J 355 Jamaika

Grübel, Rudolf

155

Einfhrung in die Differentialrechnung und ... - Springer  

Science Conference Proceedings (OSTI)

Ledp~ig und Berlin, B. G. Teubner 1934. Preis gob. RM 16,--. Das Bach nnterseheidet sieh yon der grol~en Menge iihnlicher Lehrbtieher da,dureh, dal~ es night...

156

Universitt Potsdam Institut fr Physik und Astronomie  

E-Print Network (OSTI)

-/Prüfungsleistungen: schriftlicher Ergebnisbericht Literatur: Wissenschaftliche Originalliteratur #12;Modulbezeichnung Prüfungsordnung Empfohlene Voraussetzungen: Angestrebte Lernergebnisse: Fähigkeit, wissenschaftliche Entwicklungen Ergebnisbericht Literatur: #12;Modulbezeichnung: Forschungspraktikum: (1) Photonik und Quantenoptik / (2

Potsdam, Universität

157

Quark matter and meson properties in a Nonlocal SU(3) chiral quark model at finite temperature  

Science Conference Proceedings (OSTI)

We study the finite temperature behavior of light scalar and pseudoscalar meson properties in the context of a three-flavor nonlocal chiral quark model. The model includes mixing with active strangeness degrees of freedom, and takes care of the effect of gauge interactions by coupling the quarks with a background color field. We analyze the chiral restoration and deconfinement transitions, as well as the temperature dependence of meson masses, mixing angles, and decay constants.

Gomez Dumm, D., E-mail: dumm@fisica.unlp.edu.ar [UNLP, IFLP, Departamento de Fisica (Argentina); Contrera, G. A., E-mail: contrera@tandar.cnea.gov.ar [CONICET (Argentina)

2012-06-15T23:59:59.000Z

158

World average top-quark mass  

SciTech Connect

This paper summarizes a talk given at the Top2008 Workshop at La Biodola, Isola d Elba, Italy. The status of the world average top-quark mass is discussed. Some comments about the challanges facing the experiments in order to further improve the precision are offered.

Glenzinski, D.; /Fermilab

2008-01-01T23:59:59.000Z

159

Quark-gluon plasma (Selected Topics)  

SciTech Connect

Introductory lectures to the theory of (strongly interacting) quark-gluon plasma given at the Winter School of Physics of ITEP (Moscow, February 2010). We emphasize theoretical issues highlighted by the discovery of the low viscosity of the plasma. The topics include relativistic hydrodynamics, manifestations of chiral anomaly in hydrodynamics, superfluidity, relativistic superfluid hydrodynamics, effective stringy scalars, holographic models of Yang-Mills theories.

Zakharov, V. I., E-mail: vzakharov@itep.ru [Institute for Theoretical and Experimental Physics (Russian Federation)

2012-09-15T23:59:59.000Z

160

Joint resummation for heavy quark production  

E-Print Network (OSTI)

We present joint threshold and recoil resummed transverse momentum distributions for heavy quark hadroproduction, at next-to-leading logarithmic accuracy. We study the dependence of these distributions on the production channel, the color configurations and the differences with the pure threshold-resummed distribution.

Andrea Banfi; Eric Laenen

2004-11-18T23:59:59.000Z

Note: This page contains sample records for the topic "quarks und leptonen" 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.


161

Memory of Quark Matter Card Game  

E-Print Network (OSTI)

Scientists at the Relativistic Heavy Ion Collider (RHIC, BNL) recently discovered, that the hottest known form of matter is not a gas, but acts like a fluid. Furthermore, this fluid of quarks expands and flows much more perfectly than water or any other well known fluid. This aspect of the RHIC discovery can be introduced even to primary levels of physics education, noting that the usual solid to liquid to gas sequence of phase transitions now are known to be followed by a transition to a nearly perfect fluid, a liquid of quarks, at the largest temperatures made by humans. The educational games described herein were invented by middle school students, members of a Science Club in Hungary. The games were invented for their entertainment, the educational applications in teaching high energy particle and nuclear physics to laypersons are quite unexpected but most welcomed. This manuscript describes games with a deck of cards called Quark Matter cards, where each card represents an elementary particle. The games include an important contribution by Angela Melocoton, an administrator of the Guests, Users and Visitors (GUV) Center at BNL. It describes in simple terms, how to play the Memory of Quark Matter style card games.

J. Csrg?; Cs. Trk; T. Csrg?

2013-03-12T23:59:59.000Z

162

Jet acollinearity and quark form factors  

Science Conference Proceedings (OSTI)

Perturbative Quantum Chromodynamic corrections involving the emission of gluons which are both soft and collinear are discussed for both hadronic production of lepton pairs and e/sup +/e/sup -/ annihilation. The result is an exponential, double logarithmic quark form factor. The effect of sub-leading corrections and the possible experimental observation of the form factor are discussed.

Stirling, W.J.

1980-01-01T23:59:59.000Z

163

The search for the top quark  

SciTech Connect

This paper discusses the following topics: top search in the near future, general remarks, top search at HERA, searching for the top quarks at the Z/sup 0/ machines, finding the top at Lep II, top search in UA2, top search in UA1, and top search at CDF. 58 refs., 38 figs.

Barbaro-Galtieri, A.

1989-03-01T23:59:59.000Z

164

Single top quark production and Vtb at the Tevatron  

SciTech Connect

Single top quark production via the electroweak interaction was observed by the D0 and CDF collaborations at the Tevatron proton-antiproton collider at Fermilab. Multivariate analysis techniques are employed to extract the small single top quark signal. The combined Tevatron cross section is 2.76{sub -0.47}{sup +0.58} pb. This corresponds to a lower limit on the CKM matrix element |V{sub tb}| of 0.77. Also reported are measurements of the t-channel cross section, the top quark polarization in single top quark events, and limits on gluon-quark flavor-changing neutral currents and W{prime} boson production.

Schwienhorst, Reinhard; /Michigan State U.

2010-09-01T23:59:59.000Z

165

Heavy quarks, gluons and the confinement potential in Coulomb gauge  

SciTech Connect

We consider the heavy quark limit of Coulomb gauge QCD, with the truncation of the Yang-Mills sector to include only (dressed) two-point functions. We find that the rainbow-ladder approximation to the gap and Bethe-Salpeter equations is nonperturbatively exact and moreover, we provide a direct connection between the temporal gluon propagator and the quark confinement potential. Further, we show that only bound states of color singlet quark-antiquark (meson) and quark-quark (SU(2) baryon) pairs are physically allowed.

Popovici, Carina; Watson, Peter; Reinhardt, Hugo [Institut fuer Theoretische Physik, Universitaet Tuebingen, Auf der Morgenstelle 14, D-72076 Tuebingen (Germany)

2011-05-23T23:59:59.000Z

166

Photon production from an anisotropic quark-gluon plasma  

E-Print Network (OSTI)

We calculate photon production from a quark-gluon plasma which is anisotropic in momentum space including the Compton scattering and quark/anti-quark annihilation processes. We show that for a quark-gluon plasma which has an oblate momentum-space anisotropy the photon production rate has an angular dependence which is peaked transverse to the beam line. We propose to use the angular dependence of high-energy medium photon production to experimentally determine the degree of momentum-space isotropy of a quark-gluon plasma produced in relativistic heavy-ion collisions.

Bjoern Schenke; Michael Strickland

2006-11-27T23:59:59.000Z

167

Klienten und Server mit TCL --Remote Procedure Calls und Verteilte Objekte  

E-Print Network (OSTI)

Klienten und Server mit TCL -- Remote Procedure Calls und Verteilte Objekte Axel-Tobias Schreiner-Server- Programmierung, die das Paket TCL-DP im Rahmen der Tool Command Language erschlie?t. Dieser Artikel beschäftigt sich mit aufwendigeren, aber auch wesentlich komfortableren Kommunikationsmechanismen, die TCL-DP zur

Schreiner, Axel-Tobias

168

Questions and Answers - Are quarks confineable for study?  

NLE Websites -- All DOE Office Websites (Extended Search)

is the charge of an up quarkand of down quark? is the charge of an up quark<br>and of down quark? Previous Question (What is the charge of an up quark and of down quark?) Questions and Answers Main Index Next Question (Is vacuum matter? What are ten things that are not matter? ) Is vacuum matter? What are tenthings that are not matter? Are quarks confineable for study? Quarks we study at Jefferson Lab are confined to each other by nature's laws. We shine our electrons on them to observe their behavior in their confined state. This is not so different from turning on a light to see a gold fish swimming in a glass bowl. Author: Nathan Isgur, Theory Group Leader (Other answers by Nathan Isgur) Related Pages: All About Atoms What is the smallest particle of matter known? Could there be anything smaller inside of an electron or inside of a

169

Top Quark Properties at the TeVatron  

SciTech Connect

Discovered in 1995 by CDF and D0 at the Fermilab Tevatron collider, the top quark remains interesting to test the Standard Model. Having collected more than 7 fb{sup -1} of integrated luminosity with both experiments until today, several top quark properties have been measured with increasing precision, while other properties have been investigated for the first time. In this article recent measurements of top quark properties from CDF and D0 are presented, using between 1 fb{sup -1} and 4.8 fb{sup -1} of data. In particular, the measurement of the top quark mass, the top quark width, the top antitop mass difference, a check of the electric charge of the top quark, measurements of the top antitop quark spin correlation and W helicity as well as a search for charged Higgs bosons are discussed.

Peters, Yvonne

2011-03-01T23:59:59.000Z

170

Chemie und Pharmazie Hittorfstrasse 58-62 | 48149 Mnster  

E-Print Network (OSTI)

Chemie und Pharmazie Hittorfstrasse 58-62 | 48149 Münster dekancp@uni-muenster.de AUSSCHREIBUNG STIPENDIENPROGRAMM Zum Wintersemester 2013/14 werden am Fachbereich 12, Chemie und Pharmazie, Pro

Hinrichs, Klaus

171

GM Umwelt und Energiewirtschaft GmbH | Open Energy Information  

Open Energy Info (EERE)

GM Umwelt und Energiewirtschaft GmbH Jump to: navigation, search Name GM Umwelt- und Energiewirtschaft GmbH Place Dresden, Germany Zip 1257 Sector Wind energy Product German wind...

172

The uncertainties due to quark energy loss on determining nuclear sea quark distribution from nuclear Drell-Yan data  

E-Print Network (OSTI)

By means of two different parametrizations of quark energy loss and the nuclear parton distributions determined only with lepton-nuclear deep inelastic scattering experimental data, a leading order phenomenological analysis is performed on the nuclear Drell-Yan differential cross section ratios as a function of the quark momentum fraction in the beam proton and target nuclei for E772 experimental data. It is shown that there is the quark energy loss effect in nuclear Drell-Yan process apart from the nuclear effects on the parton distribution as in deep inelastic scattering. The uncertainties due to quark energy loss effect is quantified on determining nuclear sea quark distribution by using nuclear Drell-Yan data. It is found that the quark energy loss effect on nuclear Drell-Yan cross section ratios make greater with the increase of quark momentum fraction in the target nuclei. The uncertainties from quark energy loss become bigger as the nucleus A come to be heavier. The Drell-Yan data on proton incident middle and heavy nuclei versus deuterium would result in an overestimate for nuclear modifications on sea quark distribution functions with neglecting the quark energy loss. Our results are hoped to provide good directional information on the magnitude and form of nuclear modifications on sea quark distribution functions by means of the nuclear Drell-Yan experimental data.

C. G. Duan; N. Liu; G. L. Li

2008-11-05T23:59:59.000Z

173

Free energies of heavy quarks in full-QCD lattice simulations with Wilson-type quark action  

E-Print Network (OSTI)

The free energy between a static quark and an antiquark is studied by using the color-singlet Polyakov-line correlation at finite temperature in lattice QCD with 2+1 flavors of improved Wilson quarks. From the simulations on $32^3 \\times 12$, 10, 8, 6, 4 lattices in the high temperature phase, based on the fixed scale approach, we find that, the heavy-quark free energies at short distance converge to the heavy-quark potential evaluated from the Wilson loop at zero temperature, in accordance with the expected insensitivity of short distance physics to the temperature. At long distance, the heavy-quark free energies approach to twice the single-quark free energies, implying that the interaction between heavy quarks is screened. The Debye screening mass obtained from the long range behavior of the free energy is compared with the results of thermal perturbation theory.

Y. Maezawa; S. Aoki; S. Ejiri; T. Hatsuda; N. Ishii; K. Kanaya; H. Ohno; T. Umeda

2009-07-24T23:59:59.000Z

174

Organisation der Informatikdienstleistungen am Departement fr Chemie und Biochemie  

E-Print Network (OSTI)

Organisation der Informatikdienstleistungen am Departement für Chemie und Biochemie Version 1 Informatikdienstleistungen am Departement für Chemie und Biochemie (DCB) werden von dem Informatikverantwortlichen (IVA) und-Administrator: Personalsekretariat DCB · Poolraum (Drucker) Fachverein · Homepage Departement Sekretariat BioChemie · IT

Mühlemann, Oliver

175

Organigramm 12 Organe der Stiftung und weitere Gremien 13  

E-Print Network (OSTI)

Internationale Zusammenarbeit bei den Experimenten 19 5 #12;Vorwort Vorwort Das Deutsche Elektronen Teilchenphysik über die Festkörper- und Oberflächenpyhsik, Geo- wissenschaften, Chemie und Materialforschung bis Jahr 1999 erhielt DESY Hamburg von seinen Zuwendungsgebern, der Bundesrepublik Deutsch- land (90%) und

176

Prfungs-und Studienordnung der Ludwig-Maximilians-Universitt Mnchen  

E-Print Network (OSTI)

zu anderen Wissenschaften wie z.B. Medizin, Physik, Chemie, Geologie und Geographie. 6 Durch das ersten vier Fachsemestern sowohl die Grundkenntnisse in den Teildisziplinen als auch in Physik und Chemie Kurzbezeichnungen der Module (Anlage 2/Spalte 4), 6. die Bezeichnungen der Module in Deutsch (Anlage 1/Spalte I und

Kersting, Roland

177

Globaler Wandel, Klimawandel und regionale Anpassung1 Hans von Storch  

E-Print Network (OSTI)

Interessen an Risiken (Schiff bau; offshore Aktivitäten) und Potentialen (Windenergie) und die ?ffentlichkeit ­Sicherheit, Offshore Windenergie, Interpretation von Messungen, ?lunfälle und chronische Belastungen://www.norddeutscherklimaatlas.de/). Typische Stakeholder haben zu tun mit Küsten schutz, Landwirtschaft, offshore Aktivitäten, Tourismus

von Storch, Hans

178

Heavy Quarks, QCD, and Effective Field Theory  

SciTech Connect

The research supported by this OJI award is in the area of heavy quark and quarkonium production, especially the application Soft-Collinear E#11;ective Theory (SCET) to the hadronic production of quarkonia. SCET is an e#11;ffective theory which allows one to derive factorization theorems and perform all order resummations for QCD processes. Factorization theorems allow one to separate the various scales entering a QCD process, and in particular, separate perturbative scales from nonperturbative scales. The perturbative physics can then be calculated using QCD perturbation theory. Universal functions with precise fi#12;eld theoretic de#12;nitions describe the nonperturbative physics. In addition, higher order perturbative QCD corrections that are enhanced by large logarithms can be resummed using the renormalization group equations of SCET. The applies SCET to the physics of heavy quarks, heavy quarkonium, and similar particles.

Thomas Mehen

2012-10-09T23:59:59.000Z

179

RHIC | Why Does Quark Matter Matter?  

NLE Websites -- All DOE Office Websites (Extended Search)

Why Does Quark Matter 'Matter'? Why Does Quark Matter 'Matter'? The history of modern technological development can be viewed as a series of investigations, with ever increasing resolution, into the microscopic structure of matter. Since the days of the early Greek philosophers, science has been on a continual quest to find the smallest piece - the most fundamental building block - forming the substance of the universe. STAR researchers During that journey, many beautiful and exotic properties of the subatomic world have been discovered: particles with wave-like properties the ultimate position of which can never be known; "particles" of light that deliver a fixed amount of energy when they strike the atoms of a material's surface; particles in some types of electrical conductors that

180

Boson stars: Chemical potential and quark condensates  

E-Print Network (OSTI)

We study the properties of a star made of self-gravitating bosons gas in a mean-field approximation. A generalized set of Tolman-Oppenheimer-Volkov(TOV) equations is derived to incorporate the effect of chemical-potential in the general relativistic frame work. The metric-dependence of the chemical-potential gives a new class of solutions for the boson stars. It is demonstrated that the maximum mass and radius of the star change in a significant way when the effect of finite chemical-potential is considered. We also discuss the case of a boson star made of quark-condensates. It is found that when the self-interaction between the condensates is small as compared to their mass, the typical density is too high to form a diquark-boson star. Our results indicate that the star of quark-condensate may be formed in a low-density and high-pressure regime.

Jitesh R. Bhatt; V. Sreekanth

2009-10-12T23:59:59.000Z

Note: This page contains sample records for the topic "quarks und leptonen" 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.


181

Dual quark condensate and dressed Polyakov loops  

E-Print Network (OSTI)

We construct a new order parameter for finite temperature QCD by considering the quark condensate for U(1)-valued temporal boundary conditions for the fermions. Fourier transformation with respect to the boundary condition defines the dual condensate. This quantity corresponds to an equivalence class of Polyakov loops, thereby being an order parameter for the center symmetry. We explore the duality relation between the quark condensate and these dressed Polyakov loops numerically, using quenched lattice QCD configurations below and above the QCD phase transition. It is demonstrated that the Dirac spectrum responds differently to changing the boundary condition, in a manner that reproduces the expected Polyakov loop pattern. We find the dressed Polyakov loops to be dominated by the lowest Dirac modes, in contrast to thin Polyakov loops investigated earlier.

Erek Bilgici; Falk Bruckmann; Christof Gattringer; Christian Hagen

2008-01-28T23:59:59.000Z

182

Quarkonia and heavy-quark relaxation times in the quark-gluon plasma  

E-Print Network (OSTI)

A thermodynamic T-matrix approach for elastic two-body interactions is employed to calculate spectral functions of open and hidden heavy-quark systems in the quark-gluon plasma. This enables the evaluation of quarkonium bound-state properties and heavy-quark diffusion on a common basis and thus to obtain mutual constraints. The two-body interaction kernel is approximated within a potential picture for spacelike momentum transfers. An effective field-theoretical model combining color-Coulomb and confining terms is implemented with relativistic corrections and for different color channels. Four pertinent model parameters, characterizing the coupling strengths and screening, are adjusted to reproduce the color-average heavy-quark free energy as computed in thermal lattice QCD. The approach is tested against vacuum spectroscopy in the open (D, B) and hidden (Psi and Gamma) flavor sectors, as well as in the high-energy limit of elastic perturbative QCD scattering. Theoretical uncertainties in the static reduction scheme of the four-dimensional Bethe-Salpeter equation are elucidated. The quarkonium spectral functions are used to calculate Euclidean correlators which are discussed in light of lattice QCD results, while heavy-quark relaxation rates and diffusion coefficients are extracted utilizing a Fokker-Planck equation.

Riek, F.; Rapp, Ralf.

2010-01-01T23:59:59.000Z

183

Das Mitteilungsblatt erscheint jeweils am 1. und 3. Mittwoch jeden Monats. Eigentmer, Herausgeber, Vervielfltigung und Vertrieb: Zentrale Dienste der Universitt Innsbruck,  

E-Print Network (OSTI)

Chemie und Pharmazie Acikbas Fahrettin 10 Fakultät für Chemie und Pharmazie Aldrian Jasmin 10 Fakultät für Chemie und Pharmazie Baldemair Ludwig 10 Fakultät für Chemie und Pharmazie Bauer Peter 10 Fakultät für Chemie und Pharmazie Berger Sonja 10 Fakultät für Chemie und Pharmazie Bliem Silvia 10 Fakultät

Middeldorp, Aart

184

Magnetic Phases in Dense Quark Matter  

E-Print Network (OSTI)

In this paper I discuss the magnetic phases of the three-flavor color superconductor. These phases can take place at different field strengths in a highly dense quark system. Given that the best natural candidates for the realization of color superconductivity are the extremely dense cores of neutron stars, which typically have very large magnetic fields, the magnetic phases here discussed could have implications for the physics of these compact objects.

Vivian de la Incera

2007-08-12T23:59:59.000Z

185

Magnetic Phases in Dense Quark Matter  

SciTech Connect

In this paper I discuss the magnetic phases of the three-flavor color superconductor. These phases can take place at different field strengths in a highly dense quark system. Given that the best natural candidates for the realization of color superconductivity are the extremely dense cores of neutron stars, which typically have very large magnetic fields, the magnetic phases here discussed could have implications for the physics of these compact objects.

Incera, Vivian de la [Department of Physics, Western Illinois University, Macomb, IL 61455 (United States)

2007-10-26T23:59:59.000Z

186

Baryon Spectroscopy and the Constituent Quark Model  

SciTech Connect

We explore further the idea that the lattice QCD data for hadron properties in the region m[^2][_pi] > 0.2GeV^2 can be described by the constituent quark model. This leads to a natural explanation of the fact that nucleon excited states are generally stable for pion masses greater than their physical excitation energies. Finally, we apply these same ideas to the problem of how pentaquarks might behave in lattice QCD, with interesting conclusions.

A.W. Thomas; R.D. Young

2005-07-26T23:59:59.000Z

187

The Top Quark - 2006 and Beyond  

E-Print Network (OSTI)

We know there is new physics at the electroweak scale, but we don't know what it is. Right now, the top quark is our only window on to this physics. In almost all models of electroweak symmetry breaking, top either couples strongly to new particles or its properties are modified in some way. Top is being studied in detail at the Fermilab Tevatron. Its production cross section has been measured in a variety of channels; its mass has been determined to better than 2%, and can be used to constrain the mass of the Higgs. Top quark decays have been tested and non-standard production mechanisms searched for. Single top production probes the electroweak properties of top, and has not yet been observed; searches are now closing in on this process and it should be seen soon. So far, all of the top quark's properties are consistent with the Standard Model. However, the data still to come at the Tevatron will increase the precision of all these measurements, and the enormous statistics available at the LHC will open up new possibilities such as observation of spin correlations and perhaps even CP violation in the top sector.

John Womersley

2006-04-04T23:59:59.000Z

188

Shear Viscosity in a CFL Quark Star  

E-Print Network (OSTI)

We compute the mean free path and shear viscosity in the color-flavor locked (CFL) phase of dense quark matter at low temperature T, when the contributions of mesons, quarks and gluons to the transport coefficients are Boltzmann suppressed. CFL quark matter displays superfluid properties, and transport phenomena in such cold regime are dominated by phonon-phonon scattering. We study superfluid phonons within thermal field theory and compute the mean free path associated to their most relevant collision processes. Small-angle processes turn out to be more efficient in slowing transport phenomena in the CFL matter, while the mean free path relevant for the shear viscosity is less sensitive to collinear scattering due to the presence of zero modes in the Boltzmann equation. In analogy with superfluid He4, we find the same T power law for the superfluid phonon damping rate and mean free path. Our results are relevant for the study of rotational properties of compact stars, and correct wrong estimates existing in the literature.

Cristina Manuel; Antonio Dobado; Felipe J. Llanes-Estrada

2004-06-04T23:59:59.000Z

189

Recent PQCD calculations of heavy quark production  

E-Print Network (OSTI)

We summarize the results of a recent study of heavy quark production and attenuation in cold nuclear matter. In p+p collisions, we investigate the relative contribution of partonic sub-processes to $D$ meson production and $D$ meson-triggered inclusive di-hadrons to lowest order in perturbative QCD. While gluon fusion dominates the creation of large angle $D\\bar{D}$ pairs, charm on light parton scattering determines the yield of single inclusive $D$ mesons. The distinctly different non-perturbative fragmentation of $c$ quarks into $D$ mesons versus the fragmentation of quarks and gluons into light hadrons results in a strong transverse momentum dependence of anticharm content of the away-side charm-triggered jet. In p+A reactions, we calculate and resum the coherent nuclear-enhanced power corrections from the final-state partonic scattering in the medium. We find that single and double inclusive open charm production can be suppressed as much as the yield of neutral pions from dynamical high-twist shadowing. Effects of energy loss in p+A collisions are also investigated in the incoherent Bertsch-Gunion limit and may lead to significantly weaker transverse momentum dependence of the nuclear attenuation.

Ivan Vitev

2006-05-30T23:59:59.000Z

190

Observation of Single Top Quark Production  

SciTech Connect

The author reports on the observation of electroweak production of single top quarks in p{bar p} collisions at {radical}s = 1.96 Tev using 2.3 fb{sup -1} of data collected with the D0 detector at the fermilab Tevatron Collider. Using events containing an isolated electron or muon, missing transverse energy, two, three or four jets, with one or two of them identified as originating from the fragmentation of a b quark, the measured cross section for the process p{bar p} {yields} tb + X, tqb + X is 3.94 {+-} 0.88 pb (for a top quark mass of 170 GeV). the probability to measure a cross section at this value or higher in the absence of signal is 2.5 x 10{sup -7}, corresponding to a 5.0 standard deviation significance. Using the same dataset, the measured cross sections for the t- and the s-channel processes when determined simultaneously with no assumption on their relative production rate are 3.14{sub -0.80}{sup +0.94} pb and 1.05 {+-} 0.81 pb respectively, consistent with standard model expectations. The measured t-channel cross section has a significance of 4.8 standard deviations, representing the first evidence for the production of an individual single top process to be detected.

Gerber, Cecilia E.; /Illinois U., Chicago

2009-09-01T23:59:59.000Z

191

Der venezolanische Energiemarkt zwischen Liberalisierung und Verstaatlichung : eine Untersuchung vor dem Hintergrund der Energierechtsreformen in Sdamerika und Europa, insbesondere in Deutschland.  

E-Print Network (OSTI)

??Die vorliegende Arbeit analysiert Strukturen, Entwicklungen und den aktuellen Stand der Energiewirtschaft, aus der Sicht der l-, Gas- und Stromindustrie in Venezuela sowie den Wandel (more)

Jimnez Guanipa, Henry Jos

2010-01-01T23:59:59.000Z

192

Domain growth and ordering kinetics in dense quark matter  

Science Conference Proceedings (OSTI)

The kinetics of chiral transitions in quark matter is studied in a two-flavor Nambu-Jona-Lasinio model. We focus on the phase-ordering dynamics subsequent to a temperature quench from the massless quark phase to the massive quark phase. We study the dynamics by considering a phenomenological model (Ginzburg-Landau free-energy functional). The morphology of the ordering system is characterized by the scaling of the order-parameter correlation function.

Singh, A.; Puri, S. [Jawaharlal Nehru University, School of Physical Sciences (India); Mishra, H., E-mail: hm@prl.res.in [Physical Research Laboratory, Theory Division (India)

2012-06-15T23:59:59.000Z

193

The Onset of Quark-Hadron Duality in Pion Electroproduction  

DOE Green Energy (OSTI)

A large data set of charged-pion electroproduction from both hydrogen and deuterium targets has been obtained spanning the low-energy residual-mass region. These data conclusively show the onset of the quark-hadron duality phenomenon, as predicted for high-energy hadron electroproduction. We construct several ratios from these data to exhibit the relation of this phenomenon to the high-energy factorization ansatz of electron-quark scattering and subsequent quark-to- pion production mechanisms.

Tigran Navasardyan; Gary Adams; Abdellah Ahmidouch; Tatiana Angelescu; John Arrington; Razmik Asaturyan; O. Baker; Nawal Benmouna; Crystal Bertoncini; Henk Blok; Werner Boeglin; Peter Bosted; Herbert Breuer; Michael Christy; Simon Connell; Yonggang Cui; Mark Dalton; Samuel Danagoulian; Donal Day; T. Dodario; James Dunne; Dipangkar Dutta; Najib Elkhayari; Rolf Ent; Howard Fenker; Valera Frolov; Liping Gan; David Gaskell; Kawtar Hafidi; Wendy Hinton; Roy Holt; Tanja Horn; Garth Huber; Ed Hungerford; Xiaodong Jiang; Mark Jones; Kyungseon Joo; Narbe Kalantarians; James Kelly; Cynthia Keppel; Edward Kinney; V. Kubarovski; Ya Li; Yongguang Liang; Simona Malace; Pete Markowitz; Erin McGrath; Daniella Mckee; David Meekins; Hamlet Mkrtchyan; Brian Moziak; Gabriel Niculescu; Maria-Ioana Niculescu; Allena Opper; Tanya Ostapenko; Paul Reimer; Joerg Reinhold; Julie Roche; Stephen Rock; Elaine Schulte; Edwin Segbefia; C. Smith; G.R. Smith; Paul Stoler; Vardan Tadevosyan; Liguang Tang; Maurizio Ungaro; Alicia Uzzle; Sandra Vidakovic; Anthony Villano; William Vulcan; Miao Wang; Glen Warren; Frank Wesselmann; Bogdan Wojtsekhowski; Stephen Wood; Chuncheng Xu; Lulin Yuan; Xiaochao Zheng; Hong Guo Zhu

2006-08-29T23:59:59.000Z

194

Thermodynamics of QCD at large quark chemical potential  

E-Print Network (OSTI)

We review the existing weak-coupling results on the thermodynamic potential of deconfined QCD at small and large quark chemical potential and compare with results from lattice gauge theory as well as the exactly solvable case of large-N_f QCD. We also discuss the new analytical results on non-Fermi-liquid effects in entropy and specific heat as well as in dispersion laws of quark quasiparticles at large quark chemical potential.

Andreas Gerhold; Andreas Ipp; Anton Rebhan

2005-12-21T23:59:59.000Z

195

QCD Thermodynamics with an almost realistic quark mass spectrum  

E-Print Network (OSTI)

We will report on the status of a new large scale calculation of thermodynamic quantities in QCD with light up and down quarks corresponding to an almost physical light quark mass value and a heavier strange quark mass. These calculations are currently being performed on the QCDOC Teraflops computers at BNL. We will present new lattice calculations of the transition temperature and various susceptibilities reflecting properties of the chiral transition. All these quantities are of immediate interest for heavy ion phenomenology.

C. Schmidt

2006-01-25T23:59:59.000Z

196

Report of the Quark Flavor Physics Working Group  

E-Print Network (OSTI)

This report represents the response of the Intensity Frontier Quark Flavor Physics Working Group to the Snowmass charge. We summarize the current status of quark flavor physics and identify many exciting future opportunities for studying the properties of strange, charm, and bottom quarks. The ability of these studies to reveal the effects of new physics at high mass scales make them an essential ingredient in a well-balanced experimental particle physics program.

J. N. Butler; Z. Ligeti; J. L. Ritchie; V. Cirigliano; S. Kettell; R. Briere; A. A. Petrov; A. Schwartz; T. Skwarnicki; J. Zupan; N. Christ; S. R. Sharpe; R. S. Van de Water; W. Altmannshofer; N. Arkani-Hamed; M. Artuso; D. M. Asner; C. Bernard; A. J. Bevan; M. Blanke; G. Bonvicini; T. E. Browder; D. A. Bryman; P. Campana; R. Cenci; D. Cline; J. Comfort; D. Cronin-Hennessy; A. Datta; S. Dobbs; M. Duraisamy; A. X. El-Khadra; J. E. Fast; R. Forty; K. T. Flood; T. Gershon; Y. Grossman; B. Hamilton; C. T. Hill; R. J. Hill; D. G. Hitlin; D. E. Jaffe; A. Jawahery; C. P. Jessop; A. L. Kagan; D. M. Kaplan; M. Kohl; P. Krizan; A. S. Kronfeld; K. Lee; L. S. Littenberg; D. B. MacFarlane; P. B. Mackenzie; B. T. Meadows; J. Olsen; M. Papucci; Z. Parsa; G. Paz; G. Perez; L. E. Piilonen; K. Pitts; M. V. Purohit; B. Quinn; B. N. Ratcliff; D. A. Roberts; J. L. Rosner; P. Rubin; J. Seeman; K. K. Seth; B. Schmidt; A. Schopper; M. D. Sokoloff; A. Soni; K. Stenson; S. Stone; R. Sundrum; R. Tschirhart; A. Vainshtein; Y. W. Wah; G. Wilkinson; M. B. Wise; E. Worcester; J. Xu; T. Yamanaka

2013-11-05T23:59:59.000Z

197

Phase diagram of hot quark matter under magnetic field  

Science Conference Proceedings (OSTI)

I review the computation of the phase diagram of hot quark matter in strong magnetic field, at zero baryon density, within an effective model of Quantum Chromodynamics.

Ruggieri, Marco [Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502 (Japan)

2010-12-22T23:59:59.000Z

198

Quark flavour mixing and the exponential form of the Kobayashi ...  

Science Conference Proceedings (OSTI)

At present the Higgs boson remains the only one missing piece of the standard model to be confirmed experimentally. The quark mass eigenstates differ from...

199

Cooling of Neutron Stars with Color Superconducting Quark Cores  

E-Print Network (OSTI)

We show that within a recently developed nonlocal chiral quark model the critical density for a phase transition to color superconducting quark matter under neutron star conditions can be low enough for these phases to occur in compact star configurations with masses below 1.3 M_solar. We study the cooling of these objects in isolation for different values of the gravitational mass. Our equation of state (EoS) allows for 2SC quark matter with a large quark gap \\~100 MeV for u and d quarks of two colors that coexists with normal quark matter within a mixed phase in the hybrid star interior. We argue that, if the phases with unpaired quarks were allowed, the corresponding hybrid stars would cool too fast. If they occured for M cooling data existing by today. We discuss a "2SC+X" phase, as a possibility to have all quarks paired in two-flavor quark matter under neutron star constraints, where the X-gap is of the order of 10 keV - 1 MeV. Density independent gaps do not allow to fit the cooling data. Only the presence of an X-gap that decreases with increase of the density could allow to appropriately fit the data in a similar compact star mass interval to that following from a purely hadronic model. This scenario is suggested as an alternative explanation of the cooling data in the framework of a hybrid star model.

Hovik Grigorian; David Blaschke; Dmitri Voskresensky

2004-11-22T23:59:59.000Z

200

Studies of top quark properties at the Tevatron  

Science Conference Proceedings (OSTI)

An overview of the recent measurements of the top quark properties in proton antiproton collisions at {radical}s = 1.96 TeV is presented. These measurements are based on 5.4-8.7 fb{sup -1} of data collected with the D0 and CDF experiments at the Fermilab Tevatron collider. The top quark mass and width measurements, studies of the spin correlation in top quark pair production, W boson helicity measurement, searches for anomalous top quark couplings and Lorentz invariance violation are discussed.

Shary, Viatcheslav

2012-05-01T23:59:59.000Z

Note: This page contains sample records for the topic "quarks und leptonen" 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.


201

Fluctuations of Chromodynamic Fields in Quark-Gluon Plasma  

E-Print Network (OSTI)

Chromodynamic fluctuations in the collisionless quark-gluon plasma are found as a solution of the initial value linearized problem. The stable and unstable plasmas are discussed.

Mrowczynski, Stanislaw

2008-01-01T23:59:59.000Z

202

Light front approach to correlations in hot quark matter  

E-Print Network (OSTI)

We investigate two-quark correlations in hot and dense quark matter. To this end we use the light front field theory extended to finite temperature $T$ and chemical potential $\\mu$. Therefore it is necessary to develop quantum statistics formulated on the light front plane. As a test case for light front quantization at finite $T$ and $\\mu$ we consider the NJL model. The solution of the in-medium gap equation leads to a constituent quark mass which depends on $T$ and $\\mu$. Two-quark systems are considered in the pionic and diquark channel. We compute the masses of the two-body system using a $T$-matrix approach.

S. Strauss; M. Beyer; S. Mattiello

2005-11-01T23:59:59.000Z

203

Jefferson Lab Science Series - Hidden Worlds - Hunting for Quarks...  

NLE Websites -- All DOE Office Websites (Extended Search)

Extinctions and Giant Asteroids) Science Series Video Archive Next Video (Comic Book Physics) Comic Book Physics Hidden Worlds - Hunting for Quarks in Ordinary Matter Dr....

204

QCD Thermodynamics with Three Flavors of Improved Staggered Quarks  

E-Print Network (OSTI)

We report on a study of QCD thermodynamics with three flavors of quarks, using a Symanzik improved gauge action and the Asqtad O(a^2) improved staggered quark action. Simulations were carried out with lattice spacings 1/4T, 1/6T and 1/8T both for three degenerate quarks with masses less than or equal to the strange quark mass, m_s, and for degenerate up and down quarks with masses in the range 0.1 m_s \\leq m_{u,d} \\leq 0.6 m_s, and the strange quark mass fixed near its physical value. We present results for standard thermodynamics quantities, such as the Polyakov loop, the chiral order parameter and its susceptibility. For the quark masses studied to date we find a rapid crossover rather than a bona fide phase transition. We have carried out the first calculations of quark number susceptibilities with three flavors of sea quarks. These quantities are of physical interest because they are related to event-by-event fluctuations in heavy ion collision experiments. Comparison of susceptibilities at different lattice spacings show that our results are close to the continuum values.

The MILC Collaboration; C. Bernard; T. Burch; C. DeTar; Steven Gottlieb; E. B. Gregory; U. M. Heller; J. Osborn; R. Sugar; D. Toussaint

2004-05-27T23:59:59.000Z

205

Proposal to support junior scientists participation of Quark Matter 2004  

SciTech Connect

This report summarizes the student and post-doc support budget for quark matter 2004 conference, held at Oakland in January 2004.

Huan Zhong Huang; Kenneth Barish; Hans Georg Ritter

2005-12-15T23:59:59.000Z

206

Heavy flavor production and top quark search at hadron colliders  

SciTech Connect

We review heavy flavor production at hadron colliders, with an eye towards the physics of the top quark. Motivation for existence of top, and current status of top search are reviewed. The physics of event simulation at hadron colliders is reviewed. We discuss characteristics of top quark events at p{bar p} colliders that may aid in distinguishing the top quark signal from Standard Model backgrounds, and illustrate various cuts which may be useful for top discovery. Top physics at hadron supercolliders is commented upon, as well as top quark mass measurement techniques. 22 refs., 5 figs.

Baer, H.A.

1991-01-01T23:59:59.000Z

207

Color superconductivity in ultra-dense quark matter  

E-Print Network (OSTI)

At ultra-high density, matter is expected to form a degenerate Fermi gas of quarks in which there is a condensate of Cooper pairs of quarks near the Fermi surface. This phenomenon is called color superconductivity. In these proceedings I review the underlying physics of color superconductivity and our current understanding of the possible phases of real-world quark matter. Then I consider how lattice gauge theorists would proceed to investigate the phase structure of dense quark matter if it were possible to perform the path integral numerically, i.e. if the sign problem had been solved.

Mark G. Alford

2006-10-06T23:59:59.000Z

208

THERMODYNAMICS AND HEAVY-QUARK FREE ENERGIES AT FINITE TEMPERATURE AND DENSITY WITH TWO FLAVORS OF IMPROVED WILSON QUARKS.  

SciTech Connect

Thermodynamics of two-flavor QCD at finite temperature and density is studied on a 16{sup 3} x 4 lattice, using a renormalization group improved gauge action and the clover improved Wilson quark action. In the simulations along lines of constant m{sub PS}/m{sub V}, we calculate the Taylor expansion coefficients of the heavy-quark free energy with respect to the quark chemical potential ({mu}{sub q}) up to the second order. By comparing the expansion coefficients of the free energies between quark(Q) and antiquark({anti Q}), and between Q and Q, we find a characteristic difference at finite {mu}{sub q} due to the first order coefficient of the Taylor expansion. We also calculate the quark number and isospin susceptibilities, and find that the second order coefficient of the quark number susceptibility shows enhancement around the pseudo-critical temperature.

MAEZAWA,Y.; HATSUDA, T.; AOKI, S.; KANAYA, K.; EJIRI, S.; ISHII, N.; UKITA, N.; UMEDA, T.

2007-07-30T23:59:59.000Z

209

B-meson decay constants with domain-wall light quarks and nonperturbatively tuned relativistic b-quarks  

E-Print Network (OSTI)

We report on our progress to obtain the decay constants f_B and f_Bs from lattice-QCD simulations on the RBC-UKQCD Collaborations 2+1 flavor domain-wall Iwasaki lattices. Using domain-wall light quarks and relativistic b-quarks we analyze data with several partially quenched light-quark masses at two lattice spacings of a approx 0.11 fm and a approx 0.08 fm.

Oliver Witzel

2013-11-01T23:59:59.000Z

210

Fakultat fur Mathematik und Naturwissenschaften Institute fur Mathematik, Physik und Chemie/Biotechnik  

E-Print Network (OSTI)

Chemie/Biotechnik Sportfest FIFA Confed-Cup Brasilien 2013 Finale 1.7.2013 Rio de Janeiro Werte 2013 das Sportfest der Institute f¨ur Mathematik, Physik, Chemie und Biotechnik der Fakult¨at durchf

Knobloch,Jürgen

211

Verbesserung der medizinischen Versorgung und des Outcomes sehr kleiner und leichter Frhgeborener durch klinisches Benchmarking.  

E-Print Network (OSTI)

??In der vorliegenden Arbeit wurde anhand der im Rahmen des Vermont-Oxford-Neonatal-Networks erhobenen Daten an der Berliner Klinik fr Neonatologie der Charit Campus Mitte und der (more)

Btzel, Carolin

2006-01-01T23:59:59.000Z

212

Studies of top quark production at D0  

Science Conference Proceedings (OSTI)

I present recent results on top quark production in pp collisions at a center of mass energy of 1.96 TeV. The studies were performed by the D0 collaboration using approximately 5 fb{sup -1} of data taken during Run II at the Fermilab Tevatron accelerator. The top quark is the heaviest known elementary particle and completes the quark sector of the three-generation structure of the standard model (SM). It differs from the other quarks not only by its much larger mass, but also by its lifetime which is too short to build hadronic bound states. The SM predicts that top quarks are created via two independent production mechanisms at hadron colliders. The primary mode, in which a t{bar t} pair is produced from a gtt vertex via the strong interaction, was used by the D0 and CDF collaborations to establish the existence of the top quark in 1995. The second production mode of top quarks at hadron colliders is the electroweak production of a single top quark from a Wtb vertex. The predicted cross section for single top quark production is about half that of t{bar t} pairs but the signal-to-background ratio is much worse; observation of single top quark production has therefore until recently been impeded by its low rate and difficult background environment compared to the top pair production. In the following sections I will present results for the measurement of the t{bar t} pair and the single top quark production cross section using respectively 5.3 fb{sup -1} and 5.4 fb{sup -1} of data taken by the D0 experiment.

Gerber, Cecilia E.; /Illinois U., Chicago

2011-07-01T23:59:59.000Z

213

Strange quark content of the nucleon  

E-Print Network (OSTI)

We discuss the calculation of disconnected diagrams needed for determining the strange quark content of the nucleon on the lattice. We present results for the strange scalar form factor and the related parameter fT s, which enters into the cross-section for the scattering of dark matter off nuclei in supersymmetric extensions of the standard model. In addition, we present results for the strange contribution to the nucleons axial and electromagnetic form factors. The calculations were performed with two dynamical flavors of Wilson fermions on a 24 3 64 anisotropic lattice with as ? 3at ? 0.11 fm and M? ? 400 MeV.

James Osborn; Claudio Rebbi Ab; Ronald Babich

2008-01-01T23:59:59.000Z

214

ASSOCIATED HIGGS BOSON PRODUCTION WITH HEAVY QUARKS.  

SciTech Connect

The production of a Higgs boson in association with a pair of e quarks will play a very important role at both hadron and lepton colliders. We review the status of theoretical predictions and their relevance to Higgs boson studies, with particular emphasis on the recently calculated NLO QCD corrections to the inclusive cross section for p{bar p}, pp {yields} t{bar t}h. We conclude by briefly discussing the case of exclusive b{bar b}h production and the potential of this process in revealing signals of new physics beyond the Standard Model.

DAWSON,S.ORR,L.H.REINA,L.WACKEROTH,D.

2003-03-15T23:59:59.000Z

215

Top quark mass measurement at the Tevatron  

SciTech Connect

The authors report on the latest experimental measurements of the top quark mass by the CDF and D0 Collaborations at the Fermilab Tevatron. They present a new top mass measurement using the t{bar t} events collected by the D0 Collaboration in Run I between 1994 and 1996. This result is combined with previous measurements to yield a new world top mass average. They also describe several preliminary results using up to 193 pb{sup -1} of t{bar t} events produced in {bar p}p collisions at {radical}s = 1.96 TeV during the Run II of the Tevatron.

Guimaraes da Costa, Joao; /Harvard U.

2004-12-01T23:59:59.000Z

216

UNIVERSITT ULM "Organische, Metallorganische und Makromolekulare Chemie "  

E-Print Network (OSTI)

UNIVERSIT?T ULM Kolloquium "Organische, Metallorganische und Makromolekulare Chemie " Seminarraum Chemie III Thema: "Kurzvortrag Diplomarbeit" 03. Dezember 2010 Prof. Dr. Iris M. Oppel RWTH Aachen, Institut für Anorganische Chemie Thema: "Nano-Puzzle, molekulare Bausteine in der supramolekularen

Pfeifer, Holger

217

zukunft forschung 020950 CHEMIE UND BIOLOGIE  

E-Print Network (OSTI)

zukunft forschung 020950 ZWISCHEN CHEMIE UND BIOLOGIE Als erfolgreiche Nachwuchswissenschaftlerin in Gro?britannien. Dem Leiter ihrer neuen Forschungsgruppe wurde in diesem Jahr der Chemie-Nobelpreis zuerkannt. B auf die bioor- ganische Chemie spezialisiert hatte. In der Gruppe um den RNA-Spezialisten Ronald

Breu, Ruth

218

Zentrum Innere Medizin Abteilung Nephrologie und Rheumatologie  

E-Print Network (OSTI)

Chemie wurde die ,,Proteomics-Plattform" in der UMG weiterentwickelt und die Res- sourcen gebündelt-2008 Forschungsförderungspreis Deutsche Gesellschaft für Rheumatologie, 2007 Ausgewählte Publikationen Selected Publications physikalische Chemie III (Prof. Neumann), die grundlegenden Membranvorgänge bei der elektro- porativen

Gollisch, Tim

219

Zustzliche Studienanfngerpltze an niederschsischen Universitten und Hochschulen  

E-Print Network (OSTI)

Nanotechnologie / B.Sc. 18 Mathematik / B.Sc. 29 Mathematik / 2-Fach-Bachelor 24 Chemie / B.Sc. 53 Chemie / 2-Fach Informationsmanagement und Informationstechnologie / B.Sc. 15 Deutsch / 2-Fach-Bachelor 15 Englisch / 2-Fach-Bachelor 10-Fach-Bachelor 10 Chemie / 2-Fach-Bachelor 5 Physik / 2-Fach-Bachelor 5 insgesamt 250 #12;- 8 - 2

Kallenrode, May-Britt

220

Fakultt fr Natur-und Materialwissenschaften  

E-Print Network (OSTI)

Anorganische und Analytische Chemie Prof. Dr. Wilhelm Oppermann Institut für Physikalische Chemie Prof. Dr. Dieter Kaufmann Institut für Organische Chemie Prof. Dr. Diethelm Johannsmann Institut für Physikalische Chemie Prof. Dr. Eike Hübner Institut für Organische Chemie Prof. Dr. Joachim Deubener Institut für

Angermann, Lutz

Note: This page contains sample records for the topic "quarks und leptonen" 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.


221

Titel des Moduls: Hochspannungstechnik, Energieversorgungsnetze und  

E-Print Network (OSTI)

, liebe Kollegen, das thema,,energie" - gekennzeichnet z.B. durch die Schlagworte,,energiewende","erneuerbare Glasmacher "eRneueRBARe eneRGie iSt Die ZuKunft" Herrmann Scheer #12; energie und Gebäude ­ ieg, GSO nürnberg www.ieg.ohm-hochschule.de wolfram

Wichmann, Felix

222

Portal Online Wissenswertes aus Forschung und Lehre  

E-Print Network (OSTI)

Ausbildungsbetrieb für "Grü- ne Berufe" Botanischer Garten der Universität auf der Internationalen Grünen Woche den Botanischen Garten der Universität Potsdam mit einer Plakette als ,,Ausgezeich- neten Botanischen Garten erlernen derzeit zehn künftige Gärtnerinnen und Gärtner für Zierpflanzenbau ihren Beruf

Potsdam, Universität

223

Top quark and charged Higgs production at hadron colliders  

Science Conference Proceedings (OSTI)

I present a brief theoretical update on top quark pair production at the Tevatron and give values of the NNLO-NNNLL cross section for both mt = 175 and 178 GeV. I then present a calculation of the cross section for charged Higgs production in association with a top quark at the LHC, including NNLO soft-gluon corrections.

Kidonakis, Nikolaos [Kennesaw State University, Physics no. 1202, 1000 Chastain Rd, Kennesaw, GA 30144-5591 (United States)

2005-10-06T23:59:59.000Z

224

UniReport Satzungen und Ordnungen vom 25.09.2012 1 Ordnung des Fachbereichs Biochemie, Chemie und Pharmazie der Johann  

E-Print Network (OSTI)

UniReport Satzungen und Ordnungen vom 25.09.2012 1 Ordnung des Fachbereichs Biochemie, Chemie und) Die vom Fachbereich Biochemie, Chemie und Pharmazie am 12.03.2012 aufgrund des § 44 Abs.1 i.V. mit, Chemie und Pharmazie der Johann Wolfgang Goethe-Universität Frankfurt am Main den akademischen Grad

Mester, Rudolf

225

Das Mitteilungsblatt erscheint jeweils am 1. und 3. Mittwoch jeden Monats. Eigentmer, Herausgeber, Vervielfltigung und Vertrieb: Zentrale Dienste der Universitt Innsbruck,  

E-Print Network (OSTI)

Mitglieder und Ersatzmitglieder des Fakultätsrats der Fakultät für Chemie und Pharmazie 108. Kundmachung des des Fakultätsrats der Fakultät für Chemie und Pharmazie 109. Kundmachung des Wahlergebnisses zur Wahl die Studien: D ?bersetzen und Dolmetschen (Deutsch, Englisch, Französisch, Italienisch, Spanisch

Breu, Ruth

226

The Top Quark, Its Discovery, and Subsequent Research  

Office of Scientific and Technical Information (OSTI)

The Top Quark, Its Discovery, and Subsequent Research The Top Quark, Its Discovery, and Subsequent Research Resources with Additional Information 'Ever since the existence of the bottom (or b) quark was inferred from the discovery of the Upsilon family of resonances at Fermilab in 1977, particle physicists have been on the lookout for its partner, called top (or t). The long search, which occupied experimenters at laboratories around the world, came to a successful conclusion in February 1995 with the announcement that the top quark had been observed in two experiments at the Tevatron proton-antiproton collider at Fermilab. ... Top Quark Courtesy Fermilab Top is the last of the fundamental constituents of subnuclear matter that theories of the strong, weak, and electromagnetic interactions and a wealth of experimental information had led particle physicists to expect. Theoretically, top's existence was required to make the electroweak theory internally consistent.'1

227

Searches for New Vector Like Quarks: Higgs Channels  

E-Print Network (OSTI)

New vector-like quarks can mix sizably with first generation Standard Model quarks without conflicting with current experimental constraints. Searches for such new quarks have been performed in pair production and electroweak single production channels with subsequent decays into electroweak gauge bosons. To fully explore the underlying structure of the theory the channels with heavy quark decays into Higgs bosons are crucial and in this article we consider for the first time the LHC reach for such channels. The two main production mechanisms involve single production of new quarks through the fusion of a vector boson and the Higgs and single production in association with a Higgs boson. We show that both channels have promising reach at the LHC and that they complement the current direct searches involving decays into electroweak gauge bosons.

Anupama Atre; Mikael Chala; Jose Santiago

2013-02-01T23:59:59.000Z

228

Searches for New Vector Like Quarks: Higgs Channels  

E-Print Network (OSTI)

New vector-like quarks can mix sizably with first generation Standard Model quarks without conflicting with current experimental constraints. Searches for such new quarks have been performed in pair production and electroweak single production channels with subsequent decays into electroweak gauge bosons. To fully explore the underlying structure of the theory the channels with heavy quark decays into Higgs bosons are crucial and in this article we consider for the first time the LHC reach for such channels. The two main production mechanisms involve single production of new quarks through the fusion of a vector boson and the Higgs and single production in association with a Higgs boson. We show that both channels have promising reach at the LHC and that they complement the current direct searches involving decays into electroweak gauge bosons.

Atre, Anupama; Santiago, Jose

2013-01-01T23:59:59.000Z

229

Determination of the width of the top quark  

E-Print Network (OSTI)

We extract the total width of the top quark, Gamma_t, from the partial decay width Gamma(t -> W b) measured using the t-channel cross section for single top quark production and from the branching fraction B(t -> W b) measured in ttbar events using up to 2.3 fb^-1 of integrated luminosity collected by the D0 Collaboration at the Tevatron ppbar Collider. The result is Gamma_t = 1.99 +0.69 -0.55 GeV, which translates to a top-quark lifetime of tau_t = (3.3 +1.3 -0.9) x 10^-25 s. Assuming a high mass fourth generation b' quark and unitarity of the four-generation quark-mixing matrix, we set the first upper limit on |Vtb'| < 0.63 at 95% C.L.

V. M. Abazov; B. Abbott; M. Abolins; B. S. Acharya; M. Adams; T. Adams; G. D. Alexeev; G. Alkhazov; A. Altona; G. Alverson; G. A. Alves; L. S. Ancu; M. Aoki; Y. Arnoud; M. Arov; A. Askew; B. \\degAsman; O. Atramentov; C. Avila; J. BackusMayes; F. Badaud; L. Bagby; B. Baldin; D. V. Bandurin; S. Banerjee; E. Barberis; P. Baringer; J. Barreto; J. F. Bartlett; U. Bassler; V. Bazterra; S. Beale; A. Bean; M. Begalli; M. Begel; C. Belanger-Champagne; L. Bellantoni; S. B. Beri; G. Bernardi; R. Bernhard; I. Bertram; M. Besan?con; R. Beuselinck; V. A. Bezzubov; P. C. Bhat; V. Bhatnagar; G. Blazey; S. Blessing; K. Bloom; A. Boehnlein; D. Boline; T. A. Bolton; E. E. Boos; G. Borissov; T. Bose; A. Brandt; O. Brandt; R. Brock; G. Brooijmans; A. Bross; D. Brown; J. Brown; X. B. Bu; D. Buchholz; M. Buehler; V. Buescher; V. Bunichev; S. Burdinb; T. H. Burnett; C. P. Buszello; B. Calpas; E. Camacho-P?erez; M. A. Carrasco-Lizarraga; B. C. K. Casey; H. Castilla-Valdez; S. Chakrabarti; D. Chakraborty; K. M. Chan; A. Chandra; G. Chen; S. Chevalier-Th?ery; D. K. Cho; S. W. Cho; S. Choi; B. Choudhary; T. Christoudias; S. Cihangir; D. Claes; J. Clutter; M. Cooke; W. E. Cooper; M. Corcoran; F. Couderc; M. -C. Cousinou; A. Croc; D. Cutts; M. ?Cwiok; A. Das; G. Davies; K. De; S. J. de Jong; E. De La Cruz-Burelo; F. D?eliot; M. Demarteau; 47 R. Demina; D. Denisov; S. P. Denisov; S. Desai; K. DeVaughan; H. T. Diehl; M. Diesburg; A. Dominguez; T. Dorland; A. Dubey; L. V. Dudko; D. Duggan; A. Duperrin; S. Dutt; A. Dyshkant; M. Eads; D. Edmunds; J. Ellison; V. D. Elvira; Y. Enari; S. Eno; H. Evans; A. Evdokimov; V. N. Evdokimov; G. Facini; T. Ferbel; F. Fiedler; F. Filthaut; W. Fisher; H. E. Fisk; M. Fortner; H. Fox; S. Fuess; T. Gadfort; A. Garcia-Bellido; V. Gavrilov; P. Gay; W. Geist; W. Geng; D. Gerbaudo; C. E. Gerber; Y. Gershtein; G. Ginther; G. Golovanov; A. Goussiou; P. D. Grannis; S. Greder; H. Greenlee; Z. D. Greenwood; E. M. Gregores; G. Grenier; Ph. Gris; J. -F. Grivaz; A. Grohsjean; S. Gr?unendahl; M. W. Gr?unewald; F. Guo; J. Guo; G. Gutierrez; P. Gutierrez; A. Haasc; S. Hagopian; J. Haley; L. Han; K. Harder; A. Harel; J. M. Hauptman; J. Hays; T. Head; T. Hebbeker; D. Hedin; H. Hegab; A. P. Heinson; U. Heintz; C. Hensel; I. Heredia-De La Cruz; K. Herner; G. Hesketh; M. D. Hildreth; R. Hirosky; T. Hoang; J. D. Hobbs; B. Hoeneisen; M. Hohlfeld; S. Hossain; Z. Hubacek; N. Huske; V. Hynek; I. Iashvili; R. Illingworth; A. S. Ito; S. Jabeen; M. Jaffr?e; S. Jain; D. Jamin; R. Jesik; K. Johns; M. Johnson; D. Johnston; A. Jonckheere; P. Jonsson; J. Joshi; A. Justed; K. Kaadze; E. Kajfasz; D. Karmanov; P. A. Kasper; I. Katsanos; R. Kehoe; S. Kermiche; N. Khalatyan; A. Khanov; A. Kharchilava; Y. N. Kharzheev; D. Khatidze; M. H. Kirby; J. M. Kohli; A. V. Kozelov; J. Kraus; A. Kumar; A. Kupco; T. Kur?ca; V. A. Kuzmin; J. Kvita; S. Lammers; G. Landsberg; P. Lebrun; H. S. Lee; S. W. Lee; W. M. Lee; J. Lellouch; L. Li; Q. Z. Li; S. M. Lietti; J. K. Lim; D. Lincoln; J. Linnemann; V. V. Lipaev; R. Lipton; Y. Liu; Z. Liu; A. Lobodenko; M. Lokajicek; P. Love; H. J. Lubatti; R. Luna-Garciae; A. L. Lyon; A. K. A. Maciel; D. Mackin; R. Madar; R. Maga?na-Villalba; S. Malik; V. L. Malyshev; Y. Maravin; J. Mart?\\inez-Ortega; R. McCarthy; C. L. McGivern; M. M. Meijer; A. Melnitchouk; D. Menezes; P. G. Mercadante; M. Merkin; A. Meyer; J. Meyer; N. K. Mondal; G. S. Muanza; M. Mulhearn; E. Nagy; M. Naimuddin; M. Narain; R. Nayyar; H. A. Neal; J. P. Negret; P. Neustroev; S. F. Novaes; T. Nunnemann; G. Obrant; J. Orduna; N. Osman; J. Osta; G. J. Otero y Garz?on; 1 M. Owen; M. Padilla; M. Pangilinan; N. Parashar; V. Parihar; S. K. Park; J. Parsons; R. Partridgec; N. Parua; A. Patwa; B. Penning; M. Perfilov; K. Peters; Y. Peters; G. Petrillo; P. P?etroff; R. Piegaia; J. Piper; M. -A. Pleier; P. L. M. Podesta-Lermaf; V. M. Podstavkov; M. -E. Pol; P. Polozov; A. V. Popov; M. Prewitt; D. Price; S. Protopopescu; J. Qian; A. Quadt; B. Quinn; M. S. Rangel; K. Ranjan; P. N. Ratoff; I. Razumov; P. Renkel; P. Rich; M. Rijssenbeek; I. Ripp-Baudot; F. Rizatdinova; M. Rominsky; C. Royon; P. Rubinov; R. Ruchti; G. Safronov; G. Sajot; A. S?anchez-Hern?andez; M. P. Sanders; B. Sanghi; A. S. Santos; G. Savage; L. Sawyer; T. Scanlon; R. D. Schamberger; Y. Scheglov; H. Schellman; T. Schliephake; S. Schlobohm; C. Schwanenberger; R. Schwienhorst; J. Sekaric; H. Severini; E. Shabalina; V. Shary; A. A. Shchukin; R. K. Shivpuri; V. Simak; V. Sirotenko; P. Skubic; P. Slattery; D. Smirnov; K. J. Smith; G. R. Snow; J. Snow; S. Snyder; S. S?oldner-Rembold; L. Sonnenschein; A. Sopczak; M. Sosebee; K. Soustruznik; B. Spurlock; J. Stark; V. Stolin; D. A. Stoyanova; E. Strauss; M. Strauss; D. Strom; L. Stutte; P. Svoisky; M. Takahashi; A. Tanasijczuk; W. Taylor; M. Titov; V. V. Tokmenin; D. Tsybychev; B. Tuchming; C. Tully; P. M. Tuts; L. Uvarov

2010-09-28T23:59:59.000Z

230

WA_06_016_BP_SOLAR_INTERNATIONAL_Waiver_of_Patent_Rights_Und...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

6BPSOLARINTERNATIONALWaiverofPatentRightsUnd.pdf WA06016BPSOLARINTERNATIONALWaiverofPatentRightsUnd.pdf WA06016BPSOLARINTERNATIONALWaiverofPatentRightsU...

231

WA_04_061_ROHM_AND_HAAS_COMPANY_Waiver_of_Patent_Rights_Unde...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

61ROHMANDHAASCOMPANYWaiverofPatentRightsUnde.pdf WA04061ROHMANDHAASCOMPANYWaiverofPatentRightsUnde.pdf WA04061ROHMANDHAASCOMPANYWaiverofPatentRightsU...

232

WA_07_001_EASTMAN_KODAK_COMPANY_Waiver_of_Patent_Rights_Unde...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

01EASTMANKODAKCOMPANYWaiverofPatentRightsUnde.pdf WA07001EASTMANKODAKCOMPANYWaiverofPatentRightsUnde.pdf WA07001EASTMANKODAKCOMPANYWaiverofPatentRightsU...

233

WA_06_027_EASTMAN_KODAK_COMPANY_Waiver_of_Patent_Rights_Unde...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

7EASTMANKODAKCOMPANYWaiverofPatentRightsUnde.pdf WA06027EASTMANKODAKCOMPANYWaiverofPatentRightsUnde.pdf WA06027EASTMANKODAKCOMPANYWaiverofPatentRightsUn...

234

WA_04_062_ROHM_AND_HAAS_COMPANY_Waiver_of_Patent_Rights_Unde...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

2ROHMANDHAASCOMPANYWaiverofPatentRightsUnde.pdf WA04062ROHMANDHAASCOMPANYWaiverofPatentRightsUnde.pdf WA04062ROHMANDHAASCOMPANYWaiverofPatentRightsUn...

235

The uncertainties due to quark energy loss on determining nuclear sea quark distribution from nuclear Drell-Yan data  

E-Print Network (OSTI)

By means of two different parametrizations of quark energy loss and the nuclear parton distributions determined only with lepton-nuclear deep inelastic scattering experimental data, a leading order phenomenological analysis is performed on the nuclear Drell-Yan differential cross section ratios as a function of the quark momentum fraction in the beam proton and target nuclei for E772 experimental data. It is shown that there is the quark energy loss effect in nuclear Drell-Yan process apart from the nuclear effects on the parton distribution as in deep inelastic scattering. The uncertainties due to quark energy loss effect is quantified on determining nuclear sea quark distribution by using nuclear Drell-Yan data. It is found that the quark energy loss effect on nuclear Drell-Yan cross section ratios make greater with the increase of quark momentum fraction in the target nuclei. The uncertainties from quark energy loss become bigger as the nucleus A come to be heavier. The Drell-Yan data on proton incident mi...

Duan, C G; Li, G L

2008-01-01T23:59:59.000Z

236

The influence of quark energy loss on extracting nuclear sea quark distribution from nuclear Drell-Yan experimental data  

E-Print Network (OSTI)

By means of two typical kinds of quark energy loss parametrization and the nuclear parton distributions determined only with lepton-nuclear deep inelastic scattering experimental data, a leading order analysis are performed on the proton-induced Drell-Yan differential cross section ratios of tungsten versus deuterium as a function of the quark momentum fraction in the beam proton and target nuclei. It is found that the theoretical results with quark energy loss are in good agreement with the experimental data. The quark energy loss effect produce approximately 3% to 11% suppression on the Drell-Yan differential cross section ratios $R_{W/D}$ in the range $0.05\\leq x_2\\leq0.3$. The application of nuclear Drell-Yan data with heavy targets is remarkably subject to difficulty in the constraints of the nuclear sea-quark distribution.

Chun-Gui, Duan

2008-01-01T23:59:59.000Z

237

The influence of quark energy loss on extracting nuclear sea quark distribution from nuclear Drell-Yan experimental data  

E-Print Network (OSTI)

By means of two typical kinds of quark energy loss parametrization and the nuclear parton distributions determined only with lepton-nuclear deep inelastic scattering experimental data, a leading order analysis are performed on the proton-induced Drell-Yan differential cross section ratios of tungsten versus deuterium as a function of the quark momentum fraction in the beam proton and target nuclei. It is found that the theoretical results with quark energy loss are in good agreement with the experimental data. The quark energy loss effect produce approximately 3% to 11% suppression on the Drell-Yan differential cross section ratios $R_{W/D}$ in the range $0.05\\leq x_2\\leq0.3$. The application of nuclear Drell-Yan data with heavy targets is remarkably subject to difficulty in the constraints of the nuclear sea-quark distribution.

Duan Chun-Gui; Liu Na

2008-09-28T23:59:59.000Z

238

Kinetik der Biogasproduktion aus nachwachsenden Rohstoffen und Glle.  

E-Print Network (OSTI)

??Die anaerobe Vergrung von nachwachsenden Rohstoffen und Glle zur Biogasproduktion als regenerative Energiequelle erfhrt seit einigen Jahren einen erheblichen Boom. Dabei werden in Deutschland in (more)

Mhnert, Pia

2007-01-01T23:59:59.000Z

239

Zur Frage der Identifikation und Bewertung von Investitionsalternativen in Mittelspannungskabelnetzen.  

E-Print Network (OSTI)

??Der Anspruch an die Elektroenergieversorgung in Industrielndern hat verschiedenen Aspekten zu gengen. Hierzu gehren: Versorgungssicherheit, Preiswrdigkeit, Effizienz, Umweltvertrglichkeit und Verbraucherfreundlichkeit. (more)

Hetzel, Steffen

2012-01-01T23:59:59.000Z

240

Narrative Strukturen und Funktionen im Computerspiel am Beispiel Fallout 3.  

E-Print Network (OSTI)

??Das Computerspiel ist ein Medium, das die Fhigkeit besitzt, Spiel und Erzhlung in sinnvoller Weise miteinander zu kombinieren. Diese Untersuchung beschftigt sich mit der narrativen (more)

Gradischnig, Thomas Johannes

2011-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "quarks und leptonen" 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

FAKULTT FR MATHEMATIK UND INFORMATIK Mathematisches Institut  

E-Print Network (OSTI)

.G.: Interfacial kinetics effect in planar solidification problems without initial undercooling. - In: Math. mod alloys. - In: J. of diff. equat. 112 (1994) S. 325-350. Chen, Z.; Hoffmann, K.-H.; Liang, J.: On a non-321. Ball, P.: Finite mass corrections to leptonic decay constants in the heavy quark effective theory. - In

Cengarle, María Victoria

242

Combined search for the quarks of a sequential fourth generation  

E-Print Network (OSTI)

Results are presented from a search for a fourth generation of quarks produced singly or in pairs in a data set corresponding to an integrated luminosity of 5 inverse femtobarns recorded by the CMS experiment at the LHC in 2011. A novel strategy has been developed for a combined search for quarks of the up- and down-type in decay channels with at least one isolated muon or electron. Limits on the mass of the fourth-generation quarks and the relevant CKM matrix elements are derived in the context of a simple extension of the standard model with a sequential fourth generation of fermions. The existence of mass-degenerate fourth-generation quarks with masses below 685 GeV is excluded at 95% confidence level for minimal off-diagonal mixing between the third- and the fourth-generation quarks. With a mass difference of 25 GeV between the quark masses, the obtained limit on the masses of the fourth-generation quarks shifts by about +/- 20 GeV. This result significantly reduces the allowed parameter space for a fourt...

Chatrchyan, Serguei; Sirunyan, Albert M; Tumasyan, Armen; Adam, Wolfgang; Aguilo, Ernest; Bergauer, Thomas; Dragicevic, Marko; Er, Janos; Fabjan, Christian; Friedl, Markus; Fruehwirth, Rudolf; Ghete, Vasile Mihai; Hammer, Josef; Hrmann, Natascha; Hrubec, Josef; Jeitler, Manfred; Kiesenhofer, Wolfgang; Knnz, Valentin; Krammer, Manfred; Krtschmer, Ilse; Liko, Dietrich; Mikulec, Ivan; Pernicka, Manfred; Rahbaran, Babak; Rohringer, Christine; Rohringer, Herbert; Schfbeck, Robert; Strauss, Josef; Taurok, Anton; Waltenberger, Wolfgang; Walzel, Gerhard; Widl, Edmund; Wulz, Claudia-Elisabeth; Mossolov, Vladimir; Shumeiko, Nikolai; Suarez Gonzalez, Juan; Bansal, Monika; Bansal, Sunil; Cornelis, Tom; De Wolf, Eddi A; Janssen, Xavier; Luyckx, Sten; Mucibello, Luca; Ochesanu, Silvia; Roland, Benoit; Rougny, Romain; Selvaggi, Michele; Staykova, Zlatka; Van Haevermaet, Hans; Van Mechelen, Pierre; Van Remortel, Nick; Van Spilbeeck, Alex; Blekman, Freya; Blyweert, Stijn; D'Hondt, Jorgen; Gonzalez Suarez, Rebeca; Kalogeropoulos, Alexis; Maes, Michael; Olbrechts, Annik; Van Doninck, Walter; Van Mulders, Petra; Van Onsem, Gerrit Patrick; Villella, Ilaria; Clerbaux, Barbara; De Lentdecker, Gilles; Dero, Vincent; Gay, Arnaud; Hreus, Tomas; Lonard, Alexandre; Marage, Pierre Edouard; Mohammadi, Abdollah; Reis, Thomas; Thomas, Laurent; Vander Marcken, Gil; Vander Velde, Catherine; Vanlaer, Pascal; Wang, Jian; Adler, Volker; Beernaert, Kelly; Cimmino, Anna; Costantini, Silvia; Garcia, Guillaume; Grunewald, Martin; Klein, Benjamin; Lellouch, Jrmie; Marinov, Andrey; Mccartin, Joseph; Ocampo Rios, Alberto Andres; Ryckbosch, Dirk; Strobbe, Nadja; Thyssen, Filip; Tytgat, Michael; Verwilligen, Piet; Walsh, Sinead; Yazgan, Efe; Zaganidis, Nicolas; Basegmez, Suzan; Bruno, Giacomo; Castello, Roberto; Ceard, Ludivine; Delaere, Christophe; Du Pree, Tristan; Favart, Denis; Forthomme, Laurent; Giammanco, Andrea; Hollar, Jonathan; Lemaitre, Vincent; Liao, Junhui; Militaru, Otilia; Nuttens, Claude; Pagano, Davide; Pin, Arnaud; Piotrzkowski, Krzysztof; Schul, Nicolas; Vizan Garcia, Jesus Manuel; Beliy, Nikita; Caebergs, Thierry; Daubie, Evelyne; Hammad, Gregory Habib; Alves, Gilvan; Correa Martins Junior, Marcos; De Jesus Damiao, Dilson; Martins, Thiago; Pol, Maria Elena; Henrique Gomes E Souza, Moacyr; Ald Jnior, Walter Luiz; Carvalho, Wagner; Custdio, Analu; Da Costa, Eliza Melo; De Oliveira Martins, Carley; Fonseca De Souza, Sandro; Matos Figueiredo, Diego; Mundim, Luiz; Nogima, Helio; Oguri, Vitor; Prado Da Silva, Wanda Lucia; Santoro, Alberto; Soares Jorge, Luana; Sznajder, Andre; Souza Dos Anjos, Tiago; Bernardes, Cesar Augusto; De Almeida Dias, Flavia; Tomei, Thiago; De Moraes Gregores, Eduardo; Lagana, Caio; Da Cunha Marinho, Franciole; Mercadante, Pedro G; Novaes, Sergio F; Padula, Sandra; Genchev, Vladimir; Iaydjiev, Plamen; Piperov, Stefan; Rodozov, Mircho; Stoykova, Stefka; Sultanov, Georgi; Tcholakov, Vanio; Trayanov, Rumen; Vutova, Mariana; Dimitrov, Anton; Hadjiiska, Roumyana; Kozhuharov, Venelin; Litov, Leander; Pavlov, Borislav; Petkov, Peicho; Bian, Jian-Guo; Chen, Guo-Ming; Chen, He-Sheng; Jiang, Chun-Hua; Liang, Dong; Liang, Song; Meng, Xiangwei; Tao, Junquan; Wang, Jian; Wang, Xianyou; Wang, Zheng; Xiao, Hong; Xu, Ming; Zang, Jingjing; Zhang, Zhen; Asawatangtrakuldee, Chayanit; Ban, Yong; Guo, Shuang; Guo, Yifei; Li, Wenbo; Liu, Shuai; Mao, Yajun; Qian, Si-Jin; Teng, Haiyun; Wang, Dayong; Zhang, Linlin; Zhu, Bo; Zou, Wei; Avila, Carlos; Gomez, Juan Pablo; Gomez Moreno, Bernardo; Osorio Oliveros, Andres Felipe; Sanabria, Juan Carlos; Godinovic, Nikola; Lelas, Damir; Plestina, Roko; Polic, Dunja; Puljak, Ivica; Antunovic, Zeljko; Kovac, Marko; Brigljevic, Vuko; Duric, Senka; Kadija, Kreso; Luetic, Jelena; Morovic, Srecko; Attikis, Alexandros; Galanti, Mario; Mavromanolakis, Georgios; Mousa, Jehad; Nicolaou, Charalambos; Ptochos, Fotios; Razis, Panos A; Finger, Miroslav; Finger Jr, Michael; Assran, Yasser; Elgammal, Sherif; Ellithi Kamel, Ali; Khalil, Shaaban; Mahmoud, Mohammed; Radi, Amr; Kadastik, Mario; Mntel, Mait; Raidal, Martti; Rebane, Liis; Tiko, Andres; Eerola, Paula; Fedi, Giacomo; Voutilainen, Mikko; Hrknen, Jaakko; Heikkinen, Mika Aatos; 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; Ungaro, Donatella; Wendland, Lauri; Banzuzi, Kukka; Karjalainen, Ahti; Korpela, Arja; Tuuva, Tuure; Besancon, Marc; Choudhury, Somnath

2012-01-01T23:59:59.000Z

243

Heavy Quark Production at the Tevatron  

E-Print Network (OSTI)

Results are presented from four CDF analyses involving heavy quark production in proton-antiproton collisions at center of mass energy 1.96 TeV. The shapes of b-jets are found to be broader than inclusive predictions and broader than both PYTHIA and HERWIG defaults. A measurement of the production cross section for psi(2S) is consistent with Run 1 results and with theoretical predictions associated with parton distribution function energy dependence. The inclusive b-jet production cross section is also consistent with theoretical predictions over six orders of magnitude. The b-bbar differential production cross section is compared to several theoretical models and found to be best described by MC@NLO + JIMMY.

Sally Seidel

2008-08-25T23:59:59.000Z

244

Weinberg Angle and Integer Electric Charges of Quarks  

E-Print Network (OSTI)

Orthogonality between photon and Z boson involves the Weinberg angle and a scheme for assignments of electric charge and weak isospin to leptons and quarks coupling to photon and Z. The Han-Nambu scheme, with integer electric charges for quarks, satisfies photon-Z orthogonality with sin^2(theta_W)= 0.25 in leading order. Experimental results for photon-photon fusion into charm-anticharm and bottom-antibottom pairs provide further support for assigning integer electric charges to quarks.

Martin A. Faessler

2013-08-22T23:59:59.000Z

245

Measurements of Top Quark Properties at the Tevatron  

SciTech Connect

The top quark is the most recently discovered of the standard model quarks, and studies of its properties are important tests of the standard model. Many measurements of top properties have been produced by the CDF and D0 collaborations, which study top quarks produced in p{bar p} collisions at the Fermilab Tevatron with a center-of-mass energy {radical}s = 1.96 TeV. We describe recent results from top properties measurements at the Tevatron using datasets corresponding to integrated luminosities up to 8.7 fb{sup -1}.

Mietlicki, David J.; /Michigan U.

2012-04-01T23:59:59.000Z

246

Combining Quark and Link Smearing to Improve Extended Baryon Operators  

SciTech Connect

The effects of Gaussian quark-field smearing and analytic stout-link smearing on the correlations of gauge-invariant extended baryon operators are studied. Gaussian quark-field smearing substantially reduces contributions from the short wavelength modes of the theory, while stout-link smearing significantly reduces the noise from the stochastic evaluations. The use of gauge-link smearing is shown to be crucial for baryon operators constructed of covariantly-displaced quark fields. Preferred smearing parameters are determined for a lattice spacing a_s ~ 0.1 fm.

Adam Lichtl; Subhasish Basak; Robert Edwards; George T. Fleming; Urs M. Heller; Colin Morningstar; David Richards; Ikuro Sato; Stephen Wallace

2005-09-29T23:59:59.000Z

247

Top Quark Production and Properties at the Tevatron  

E-Print Network (OSTI)

The precise measurement of top quark production and properties is one of the primary goals of the Tevatron during Run II. The total top-antitop production cross-section has been measured in a large variety of decay channels and using different selection criteria. Results from differential cross-section measurements and searches for new physics in top-antitop production and top quark decays are available. Electroweak production of single top quarks has been searched for. The results from all these analyses, using typically 200/pb of data, are presented.

Frank Fiedler; for the D0; CDF Collaborations

2005-06-02T23:59:59.000Z

248

Top quark mass and property measurements at Tevatron  

Science Conference Proceedings (OSTI)

The top quark, discovered in 1995 at the Fermilab Tevatron collider from CDF and D0 experiments, remains by far the most interesting particle to test standard model because of its large mass and unique properties. Having data collected about 10 fb{sup -1} of integrated luminosity of p{bar p} collision, both experiments have been studied the top quark in all the possible directions. In this article, we present the recent measurements of the top quark properties from Tevatron including the mass, width, spin correlation, and W boson helicity using t{bar t} signature.

Lee, Hyun Su

2012-01-01T23:59:59.000Z

249

Top quark, W-boson and light Higgs  

SciTech Connect

The top quark, the W-boson and the Higg boson form an interesting triptych of elementary particles. In the Standard Model knowing the mass of two of these particles, usually the top quark and W-boson, we can predict the mass of the third, the Higgs boson. Therefore in this proceedings I will primarily cover the following topics, top quark physics, W-boson mass and the light Higgs boson at the proton-antiproton collider at Fermilab, the Tevatron. Other hadron collider topics to be cover in this conference include B-physics, QCD, Electroweak Physics, and Supersymmetry.

Parke, S.

1997-10-01T23:59:59.000Z

250

The Particle Adventure | What is the world made of? | The naming of quarks  

NLE Websites -- All DOE Office Websites (Extended Search)

The naming of quarks The naming of quarks The naming of quarks The naming of quarks... ...began when, in 1964, Murray Gell-Mann and George Zweig suggested that hundreds of the particles known at the time could be explained as combinations of just three fundamental particles. Gell-Mann chose the name "quarks," pronounced "kworks," for these three particles, a nonsense word used by James Joyce in the novel Finnegan's Wake: "Three quarks for Muster Mark!" In order to make their calculations work, the quarks had to be assigned fractional electrical charges of 2/3 and -1/3. Such charges had never been observed before. Quarks are never observed by themselves, and so initially these quarks were regarded as mathematical fiction. Experiments have since convinced physicists that not only do quarks exist, but there are six of them, not three.

251

Studienplan fr das Fach Chemie und Molekulare Wissenschaften Die Philosophisch-naturwissenschaftliche Fakultt der Universitt Bern  

E-Print Network (OSTI)

Studienplan für das Fach Chemie und Molekulare Wissenschaften Die Philosophisch folgenden Studienplan für das Fach Chemie und Molekulare Wissen- schaften: I. Allgemeines Geltungsbereich Major Chemie und Molekulare Wissenschaften (Bache- lor-, Master- und Doktoratsstudium) sowie Minor

Richner, Heinz

252

Studienleiter Chemie und Molekulare Wissenschaften Sekretariat Studienleitung Prof. Thomas Wandlowski Sandra Zbinden  

E-Print Network (OSTI)

Studienleiter Chemie und Molekulare Wissenschaften Sekretariat Studienleitung Prof. Thomas Wandlowski Sandra Zbinden Departement für Chemie und Biochemie Departement für Chemie und Biochemie 6318057 e-mail: thomas.wandlowski@dcb.unibe.ch e-mail: sandra.zbinden@dcb.unibe.ch Bachelor in Chemie und

Mühlemann, Oliver

253

Das Deutsche Elektronen-Synchrotron DESY mit seinen Standorten Hamburg und Zeuthen ist eines  

E-Print Network (OSTI)

Vorwort Vorwort Das Deutsche Elektronen-Synchrotron DESY mit seinen Standorten Hamburg und Zeuthen Oberflächenpyhsik, Geo- wissenschaften, Chemie und Materialforschung bis hinzurMolekularbiologiereicht. Die Hamburg von seinen Zuwendungsgebern, der Bundesrepublik Deutsch- land (90%) und der Freien und Hansestadt

254

Aktuelles mhh Info August/September 2003 Liebe Mitarbeiterinnen und Mitarbeiter der mhh,  

E-Print Network (OSTI)

verschiedenen Firmen mit Schwerpunkt Kernforschung und Energiewirtschaft. Im Juli 2000 nahm er das Amt des

Manstein, Dietmar J.

255

Reading Comprehension - Looking for Quarks Inside the Atom  

NLE Websites -- All DOE Office Websites (Extended Search)

Looking for Quarks Inside the Atom Looking for Quarks Inside the Atom In the late 1960's, three scientists ran some accelerator experiments to study the nucleus at the _________ outside edge center perimeter of the atom. They ran the experiments because they wanted to know more about the structure of the _________ nucleus accelerator electromagnet spectrometer . They found that the protons and neutrons in the nucleus are made of quarks. The discovery of _________ alpha quarks nuclei electron raised new questions about the nucleus. The three scientists are Richard Taylor, Henry Kendall and Jerome Friedman. They did their experiments from 1967 to 1973 in California at the Stanford Linear Accelerator Center, called SLAC for short. These scientists won the 1990 Nobel Prize in Physics, one of the world's greatest honors for

256

Thermal conductivity of dense quark matter and cooling of stars  

E-Print Network (OSTI)

The thermal conductivity of the color-flavor locked phase of dense quark matter is calculated. The dominant contribution to the conductivity comes from photons and Nambu-Goldstone bosons associated with breaking of baryon number which are trapped in the quark core. Because of their very large mean free path the conductivity is also very large. The cooling of the quark core arises mostly from the heat flux across the surface of direct contact with the nuclear matter. As the thermal conductivity of the neighboring layer is also high, the whole interior of the star should be nearly isothermal. Our results imply that the cooling time of compact stars with color-flavor locked quark cores is similar to that of ordinary neutron stars.

Igor A. Shovkovy; Paul J. Ellis

2002-04-11T23:59:59.000Z

257

Hausdorff dimension of quark trajectories from SCSB and confinement  

Science Conference Proceedings (OSTI)

The quark condensate is calculated using the effective-action formalism, by imposing an ansatz for the Wilson loop, which interpolates between the area-law for large loops and the area-squared law for small loops. For 3 colors and 2 light flavors, a lower bound of 460 MeV for the constituent quark mass is found to be accessible, provided an effective scale-dependent string tension of a light quark falls off linearly with the Schwinger proper time. This behavior of the effective string tension yields the Hausdorff dimension of a light-quark trajectory equal to 4, which shows that these trajectories are similar to branched polymers. A gluonic chain based on such trajectories provides an example of a model describing weak first-order deconfinement phase transition, which takes place in SU(3) Yang-Mills theory.

Antonov, D.; Ribeiro, J. E. F. T. [Departamento de Fisica and Centro de Fisica das Interaccoes Fundamentais, Instituto Superior Tecnico, UT Lisboa, Av. Rovisco Pais, 1049-001 Lisboa (Portugal)

2011-05-23T23:59:59.000Z

258

Summary of the session on the top quark  

Science Conference Proceedings (OSTI)

The CDF and D0 experiments at the Fermilab Tevatron showed recent results on the production and properties of the top quark. The CMS and ATLAS experiments presented first observations of top events at the LHC. Prospects for the top physics at the LHC over the next few years were discussed. CDF and D0 have made remarkable progress in detemerining the properties of the top quark, which so far, conforms to the expectations of the SM. The sophisticated methods they have developed form the basis of the exploration that is now starting at the LHC. New methods, such as the use of boosted top quark signatures, will be necessary to realize fully the potential of the LHC for finding new high mass particles decaying to top and for searching for deviations from the SM. Prospects for the future of top quark physics are very bright.

Butler, Joel N.; /Fermilab

2011-01-01T23:59:59.000Z

259

On thermal nucleation of quark matter in compact stars  

E-Print Network (OSTI)

The possibility of a hadron-quark phase transition in extreme astrophysical phenomena such as the collapse of a supernova is not discarded by the modern knowledge of the high-energy nuclear and quark-matter equations of state. Both the density and the temperature attainable in such extreme processes are possibly high enough to trigger a chiral phase transition. However, the time scales involved are an important issue. Even if the physical conditions for the phase transition are favorable (for a system in equilibrium), there may not be enough time for the dynamical process of phase conversion to be completed. We analyze the relevant time scales for the phase conversion via thermal nucleation of bubbles of quark matter and compare them to the typical astrophysical time scale, in order to verify the feasibility of the scenario of hadron-quark phase conversion during, for example, the core-collapse of a supernova.

Mintz, B W; Schaffner-Bielich, J; Pagliara, G

2010-01-01T23:59:59.000Z

260

Search for Higgs bosons produced in association with b quarks  

E-Print Network (OSTI)

We present a search for neutral Higgs bosons ? decaying into bb? , produced in association with b quarks in pp? collisions. This process could be observable in supersymmetric models with high values of tan??. The event ...

Bauer, Gerry P.

Note: This page contains sample records for the topic "quarks und leptonen" 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

Hadron resonances with a quark core embedded in the continuum  

SciTech Connect

We investigate the excited baryons and mesons which cannot be described in terms of a simple constituent quark model, such as {Lambda}(1405) and X(3872) as a resonance in a coupled channel hadron-hadron (baryon-meson or meson-meson) scattering with a 'bound state embedded in the continuum' (BSEC). For this purpose, we solve the Lippmann-Schwinger equation including a BSEC in the momentum space. This BSEC is introduced by hand, as a state not originated from a simple baryon-meson or meson-meson system. We assume it comes from the three-quark state or quark-anti quark state and show such a picture can describe the {Lambda}(1405) and X(3872) resonances.

Shimizu, Kiyotaka [Department of Physics, Sophia University, Chiyoda-ku, Tokyo 102-8554 (Japan); Takeuchi, Sachiko [Japan College of Social Work, Kiyose, Tokyo 204-8555 (Japan); Takizawa, Makoto [Showa Pharmaceutical University, Machida, Tokyo 194-8543 (Japan)

2011-05-06T23:59:59.000Z

262

Twisted mass QCD and the FNAL heavy quark formalism  

E-Print Network (OSTI)

At tree level, I discuss modifying the FNAL heavy quark formalism to include a twisted mass term. I find that at maximal twist the so called KLM factor is independent of the heavy mass.

Craig McNeile

2008-10-21T23:59:59.000Z

263

Y-Scaling in a simple quark model  

SciTech Connect

A simple quark model is used to define a nuclear pair model, that is, two composite hadrons interacting only through quark interchange and bound in an overall potential. An ''equivalent'' hadron model is developed, displaying an effective hadron-hadron interaction which is strongly repulsive. We compare the effective hadron model results with the exact quark model observables in the kinematic region of large momentum transfer, small energy transfer. The nucleon reponse function in this y-scaling region is, within the traditional frame work sensitive to the nucleon momentum distribution at large momentum. We find a surprizingly small effect of hadron substructure. Furthermore, we find in our model that a simple parametrization of modified hadron size in the bound state, motivated by the bound quark momentum distribution, is not a useful way to correlate different observables.

Kumano, S.; Moniz, E.J.

1988-11-20T23:59:59.000Z

264

Color superconductivity with determinant interaction in strange quark matter  

E-Print Network (OSTI)

We investigate the effect of six fermion determinant interaction on color superconductivity as well as on chiral symmetry breaking. Coupled mass gap equations and the superconducting gap equation are derived through the minimisation of the thermodynamic potential. The effect of nonzero quark -- antiquark condensates on the superconducting gap is derived. This becomes particularly relevant for the case of 2-flavor superconducting matter with unpaired strange quarks in the diquark channel. While the effect of six fermion interaction leads to an enhancement of u-d superconductivity, due to nonvanishing strange quark--antiquark condensates, such an enhancement will be absent at higher densities for u-s or d-s superconductivity due to early (almost) vanishing of light quark-- antiquark condensates.

Amruta Mishra; Hiranmaya Mishra

2006-05-21T23:59:59.000Z

265

Quark mixing sum rules and the right unitarity triangle  

E-Print Network (OSTI)

In analogy with the recently proposed lepton mixing sum rules, we derive quark mixing sum rules for the case of hierarchical quark mass matrices with 1-3 texture zeros, in which the separate up and down type 1-3 mixing angles are approximately zero, and $V_{ub}$ is generated from $V_{cb}$ as a result of 1-2 up type quark mixing. Using the sum rules, we discuss the phenomenological viability of such textures, including up to four texture zeros, and show how the right-angled unitarity triangle, i.e., $\\alpha \\approx 90^\\circ$, can be accounted for by a remarkably simple scheme involving real mass matrices apart from a single element being purely imaginary. In the framework of grand unified theories we show how the quark and lepton mixing sum rules may combine to yield an accurate prediction for the reactor angle.

Antusch, Stefan; Malinsky, Michal; Spinrath, Martin

2009-01-01T23:59:59.000Z

266

Quark mixing sum rules and the right unitarity triangle  

E-Print Network (OSTI)

In analogy with the recently proposed lepton mixing sum rules, we derive quark mixing sum rules for the case of hierarchical quark mass matrices with 1-3 texture zeros, in which the separate up and down type 1-3 mixing angles are approximately zero, and $V_{ub}$ is generated from $V_{cb}$ as a result of 1-2 up type quark mixing. Using the sum rules, we discuss the phenomenological viability of such textures, including up to four texture zeros, and show how the right-angled unitarity triangle, i.e., $\\alpha \\approx 90^\\circ$, can be accounted for by a remarkably simple scheme involving real mass matrices apart from a single element being purely imaginary. In the framework of grand unified theories we show how the quark and lepton mixing sum rules may combine to yield an accurate prediction for the reactor angle.

Stefan Antusch; Stephen F. King; Michal Malinsky; Martin Spinrath

2009-10-27T23:59:59.000Z

267

Quark-Gluon Plasma Thermalization and Plasma Instabilities  

E-Print Network (OSTI)

In this talk, I review the important role played by plasma instabilities in the thermalization of quark-gluon plasmas at very high energy. [Conference talk presented at Strong and Electroweak Mattter 2004, Helsinki, Finland, June 16--19.

Peter Arnold

2004-08-31T23:59:59.000Z

268

Black holes and the quark-gluon plasma  

E-Print Network (OSTI)

I discuss the possibility that the quark-gluon plasma at strong coupling admits a description in terms of a black hole in asymptotically anti-de Sitter space.

George Siopsis

2009-01-26T23:59:59.000Z

269

Helicity Probabilities For Heavy Quark Fragmentation Into Excited Mesons  

E-Print Network (OSTI)

In the fragmentation of a heavy quark into a heavy meson whose light degrees of freedom have angular momentum $3/2$, all the helicity probabilities are completely determined in the heavy quark limit up to a single probability $w_{3/2}$. We point out that this probability depends on the longitudinal momentum fraction $z$ of the meson and on its transverse momentum $p_\\bot$ relative to the jet axis. We calculate $w_{3/2}$ as a function of scaling variables corresponding to $z$ and $p_\\bot$ for the heavy quark limit of the perturbative QCD fragmentation functions for $b$ quark to fragment into $(b \\bar c)$ mesons. In this model, the light degrees of freedom prefer to have their angular momentum aligned transverse to, rather than along, the jet axis. Implications for the production of excited heavy mesons, like $D^{**}$ and $B^{**}$, are discussed.

Tzu Chiang Yuan

1994-07-20T23:59:59.000Z

270

QuarkNet - Educational Materials from 2013 Workshop  

NLE Websites -- All DOE Office Websites (Extended Search)

Makers QuarkNet and the Fermi Mars Rover System (Brian Nord FNAL ) - PowerPoint Underwater Robotics - Mark Rowzee, Naperville North - PowerPoint Version Dark Energy Resources...

271

Unlike particle correlations and the strange quark matter distillation process  

E-Print Network (OSTI)

We present a new technique for observing the strange quark matter distillation process based on unlike particle correlations. A simulation is presented based on the scenario of a two-phase thermodynamical evolution model.

D. Ardouin; Sven Soff; C. Spieles; S. A. Bass; H. Stocker; D. Gourio; S. Schramm; C. Greiner; R. Lednicky; V. L. Lyuboshits; J. P. Coffin; C. Kuhn

2002-03-14T23:59:59.000Z

272

Strangeness production in hadronic and quark matter: A quantitative differentiation  

SciTech Connect

We consider the production of strange particles in relativistic nucleus-nucleus collisions employing the hadron gas (HG) and quark-gluon plasma (QGP) formalism. We locate the region in the phase diagram where [mu][sub [ital s

Asprouli, M.N.; Panagiotou, A.D. (Physics Department, Nuclear Particle Physics Division, University of Athens, Panepistimiopolis, GR-157 71 Athens (Greece))

1995-02-01T23:59:59.000Z

273

Bachelor Chemie und Molekulare Wissenschaften Stundenplan 5. Semester Herbstsemester 2012  

E-Print Network (OSTI)

Bachelor Chemie und Molekulare Wissenschaften Stundenplan 5. Semester ­ Herbstsemester 2012 Die. O. Mühlemann S481 3 ECTS Physikalische Chemie IV: Radio und Elektrochemie Prof. A. Türler Prof. T. Wandlowski N213 4 ECTS Anorganische Chemie III Prof. S. Decurtins S465 3 ECTS Praktikum Anorganische Chemie

Mühlemann, Oliver

274

Benedikt Weggler, Denise Riedel Fachschaft Chemie und Wirtschaftschemie Uni Ulm  

E-Print Network (OSTI)

CoffeeIn* Benedikt Weggler, Denise Riedel Fachschaft Chemie und Wirtschaftschemie Uni Ulm Kloposter euch ebenfalls auf diese Weise zu informieren. Die Fachschaft Chemie und Wirtschaftschemie pr direkt mit der Promotion einzusteigen. Von dieser Ma?nahme verspricht sich die Studienkommission Chemie

Pfeifer, Holger

275

JAHRESBERICHT 2008 Institut fr Land-und Seeverkehr  

E-Print Network (OSTI)

des Bewegungsverhal- tens von Terminal und LNG-Carrier als Mehrkörpersystem Schmidt, Stefan gro?zügige Spenden sowohl der Industrie, als auch von Privatpersonen (die Liste der Spender kann beim Hohen'' Teilprojekt: Hydrodynamische Kopplung von LNG-Tankern und Offshoretermi- nals im Seegang Clauss, G., Jacobsen

Berlin,Technische Universität

276

Fakultt fr Physik und Astronomie Ruprecht-Karls-Universitt Heidelberg  

E-Print Network (OSTI)

-power LEDs, RED = 632 nm and IR = 850 nm) and a camera above the ume that looks vertically through the water Hochleistungs-LEDs, RED = 632 nm und IR = 850 nm) und einer Kamera darüber, die senkrecht zur Wasserober- äche . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 3.2. Lightsource and LED control unit . . . . . . . . . . . . . . . . . . . . . . 23 3

Jaehne, Bernd

277

BERLINER AUSBILDUNGSBETRIEBE METALL (eine Auswahl) Fertigung und Montage  

E-Print Network (OSTI)

Gebäudetechnik AG Region Ost Lessingstr. 79-81 13158 Berlin 91772415 http://www.abb.de ABB Kraftwerke Berlin Gmb Kunert Markendorfer Str. 6 13439 Berlin K.A.B. Kraftwerks- und Anlagenbau GmbH (metz. Gleistechnik Gottlieb-Dunkel-Str. 50-52 12099 Berlin 6251041 http://www.thyssenkrupp.de/ KST Kraftwerks- und

Berlin,Technische Universität

278

Baldrian und Katzenminze als stimulierende Pflanzen fr Katzen  

E-Print Network (OSTI)

not but least geht mein Dank auch an all meine Besuchskatzen im Garten an den Töpfen und Pflanzen und speziell Testwesen agierten. Sie zeigen mir täglich, dass es noch weit mehr in meinem kleinen Garten gibt

Zürich, Universität

279

R. Hopfner: Schatzer und Tests, Sommersemester 2012 Ubungsblatt 2  

E-Print Network (OSTI)

Salont¨ur auf und Jacques Beauregard tritt an den Spieltisch. Dann perlt Rick der Schweiss von der Stirne, denn Jacques Beauregard ist nicht nur der beste Pistolensch¨utze weit und breit, sondern auch ein in unvorstellbarer H¨ohe sind f¨ur Jacques Beauregard kein Problem. H¨atte Rick nicht wohlversteckt eine gr

Höpfner, Reinhard

280

Observation of $t$-channel electroweak top quark production  

SciTech Connect

The top quark is the heaviest known fundamental particle, with a mass of 172.0{sub -1.3}{sup +0.9}GeV. This is nearly twice the mass of the second heaviest known particle, the Z boson, and roughly the mass of a gold atom. Because of its unusually large mass, studying the top quark may provide insight into the Higgs mechanism and other beyond the standard model physics. Only two accelerators in the world are powerful enough to produce top quarks. The Tevatron, which first accelerated protons in 1983, has produced almost 400,000 top quarks, roughly half at each of its two detectors: DO and CDF. The LHC is a much newer accelerator which currently has accumulated about 0.5% as much data as the Tevatron. However, when running at full luminosity, the LHC is capable of producing a top quark about once every second and will quickly surpass the Tevatron as the leading producer of top quarks. This analysis uses data from the D0 detector at the Tevatron, which are described in chapter 3. Top quarks are produced most often in pairs of top and anti-top quarks through an interaction of the strong force. This production mode was first observed in 1995 at the Tevatron. However, top quarks can also be produced though an electroweak interaction, which produces just one top quark. This production mode was first observed at the Tevatron in 2008. Single top quark production can occur in different channels. In this analysis, a measurement of the cross section of the t-channel production mode is performed. This measurement uses 5.4 fb{sup -1} of data and uses the technique of boosted decision trees in order to separate signal from background events. The t-channel cross section is measured to be: {sigma}(p{bar p} {yields} tqb + X) = 3.03{sub -0.66}{sup +0.78}pb (0.0.1). Additional cross section measurements were also performed for the s-channel as well as the s + t-channel. The measurement of each one of these three cross sections was repeated three times using different techniques, and all three methods were combined into a 'super-method' which achieves the best performance. The details of these additional measurements are shown in appendix A.

Triplett, Nathan; /Iowa State U.

2011-04-01T23:59:59.000Z

Note: This page contains sample records for the topic "quarks und leptonen" 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

Searching for the fourth family quarks through anomalous decays  

Science Conference Proceedings (OSTI)

The flavor democracy hypothesis predicts the existence of the fourth standard model family. Because of the high masses of the fourth family quarks, their anomalous decays could be dominant if certain criteria are met. This will drastically change the search strategy at hadron colliders. We show that the fourth standard model family down quarks with masses up to 400-450 GeV can be observed (or excluded) via anomalous decays by Tevatron.

Sahin, M.; Sultansoy, S.; Turkoz, S. [TOBB University of Economics and Technology, Physics Division, Ankara (Turkey); TOBB University of Economics and Technology, Physics Division, Ankara, Turkey and Institute of Physics, National Academy of Sciences, Baku (Azerbaijan); Ankara University, Department of Physics, Ankara (Turkey)

2010-09-01T23:59:59.000Z

282

Das Mitteilungsblatt erscheint jeweils am 1. und 3. Mittwoch jeden Monats. Eigentmer, Herausgeber, Vervielfltigung und Vertrieb: Zentrale Dienste der Universitt Innsbruck,  

E-Print Network (OSTI)

Schinner Franz 10 Fakultät für Chemie und Pharmazie Bernkop-Schnürch Andreas 10 Fakultät für Chemie und Pharmazie Bertel Erminald 10 Fakultät für Chemie und Pharmazie Bister Klaus 10 Fakultät für Chemie und Pharmazie Bonn Guenther 10 Fakultät für Chemie und Pharmazie Egermann Herbert 10 Fakultät für Chemie und

Breu, Ruth

283

Improved determination of the width of the top quark  

SciTech Connect

We present an improved determination of the total width of the top quark, {Gamma}{sub t}, using 5.4 fb{sup -1} of integrated luminosity collected by the D0 Collaboration at the Tevatron p{bar p} Collider. The total width {Gamma}{sub t} is extracted from the partial decay width {Gamma}(t {yields} Wb) and the branching fraction {Beta}(t {yields} Wb). {Gamma}(t {yields} Wb) is obtained from the t-channel single top-quark production cross section and {Beta}(t {yields} Wb) is measured in t{bar t} events. For a top mass of 172.5 GeV, the resulting width is {Gamma}{sub t} = 2.00{sub -0.43}{sup +0.47} GeV. This translates to a top-quark lifetime of {tau}{sub t} = (3.29{sub -0.63}{sup +0.90}) x 10{sup -25} s. We also extract an improved direct limit on the Cabibbo-Kobayashi-Maskawa quark-mixing matrix element 0.81 < |V{sub tb}| {le} 1 at 95% C.L. and a limit of |V{sub tb}| < 0.59 for a high-mass fourth-generation bottom quark assuming unitarity of the fourth-generation quark-mixing matrix.

Abazov V. M.; Abbott B.; Acharya B. S.; Adams M.; Adams T.; Alexeev G. D.; Alkhazov G.; Alton A.; Alverson G.; Aoki M.; Askew A.; Asman B.; Atkins S.; Atramentov O.; Augsten K.; Avila C.; BackusMayes J.; Badaud F.; Bagby L.; Baldin B.; Bandurin D. V.; Banerjee S.; Barberis E.; Baringer P.; Barreto J.; Bartlett J. F.; Bassler U.; Bazterra V.; Bean A.; Begalli M.; Belanger-Champagne C.; Bellantoni L.; Beri S. B.; Bernardi G.; Bernhard R.; Bertram I.; Besancon M.; Beuselinck R.; Bezzubov V. A.; Bhat P. C.; Bhatia S.; Bhatnagar V.; Blazey G.; Blessing S.; Bloom K.; Boehnlein A.; Boline D.; Boos E. E.; Borissov G.; Bose T.; Brandt A.; Brandt O.; Brock R.; Brooijmans G.; Bross A.; Brown D.; Brown J.; Bu X. B.; Buehler M.; Buescher V.; Bunichev V.; Burdin S.; Burnett T. H.; Buszello C. P.; Calpas B.; Camacho-Perez E.; Carrasco-Lizarraga M. A.; Casey C. K.; Castilla-Valdez H.; Chakrabarti S.; Chakraborty D.; Chan M.; Chandra A.; Chapon E.; Chen G.; Chevalier-Thery S.; Cho D. K.; Cho S. W.; Choi S.; Choudhary B.; Cihangir S.; Claes D.; Clutter J.; Cooke M.; Cooper W. E.; Corcoran M.; Couderc F.; Cousinou M. -C.; Croc A.; Cutts D.; Das A.; Davies G.; de Jong S. J.; De La Cruz-Burelo E.; Deliot F.; Demina R.; Denisov D.; Denisov S. P.; Desai S.; Deterre C.; DeVaughan K.; Diehl H. T.; Diesburg M.; Ding P. F.; Dominguez A.; Dorland T.; Dubey A.; Dudko L. V.; Duggan D.; Duperrin A.; Dutt S.; Dyshkant A.; Eads M.; Edmunds D.; Ellison J.; Elvira V. D.; Enari Y.; Evans H.; Evdokimov A.; Evdokimov V. N.; Facini G.; Ferbel T.; Fiedler F.; Filthaut F.; Fisher W.; Fisk H. E.; Fortner M.; Fox H.; Fuess S.; Garcia-Bellido A.; Garcia-Guerra G. A.; Gavrilov V.; Gay P.; Geng W.; Gerbaudo D.; Gerber C. E.; Gershtein Y.; Ginther G.; Golovanov G.; Goussiou A.; Graf C. P.; Grannis P. D.; Greder S.; Greenlee H.; Greenwood Z. D.; Gregores E. M.; Grenier G.; Gris Ph.; Grivaz J. -F.; Grohsjean A.; Gruenendahl S.; Gruenewald M. W.; Guillemin T.; Gutierrez G.; Gutierrez P.; Haas A.; Hagopian S.; Haley J.; Han L.; Harder K.; Harel A.; Hauptman J. M.; Hays J.; Head T.; Hebbeker T.; Hedin D.; Hegab H.; Heinson A. P.; Heintz U.; Hensel C.; La Cruz I. Heredia-De; Herner K.; Hesketh G.; Hildreth M. D.; Hirosky R.; Hoang T.; Hobbs J. D.; Hoeneisen B.; Hohlfeld M.; Hubacek Z.; Hynek V.; Iashvili I.; Ilchenko Y.; Illingworth R.; Ito A. S.; Jabeen S.; Jaffre M.; Jamin D.; Jayasinghe A.; Jesik R.; Johns K.; Johnson M.; Jonckheere A.; Jonsson P.; Joshi J.; Jung A. W.; Juste A.; Kaadze K.; Kajfasz E.; Karmanov D.; Kasper P. A.; Katsanos I.; Kehoe R.; Kermiche S.; Khalatyan N.; Khanov A.; Kharchilava A.; Kharzheev Y. N.; Kohli J. M.; Kozelov A. V.; Kraus J.; Kulikov S.; Kumar A.; Kupco A.; Kurca T.; Kuzmin V. A.; Lammers S.; Landsberg G.; Lebrun P.; Lee H. S.; Lee S. W.; Lee W. M.; Lellouch J.; Li H.; Li L.; Li Q. Z.; Lietti S. M.; Lim J. K.; Lincoln D.; Linnemann J.; Lipaev V. V.; Lipton R.; Liu Y.; Lobodenko A.; Lokajicek M.; de Sa R. Lopes; Lubatti H. J.; Luna-Garcia R.; Lyon A. L.; Maciel A. K. A.; Mackin D.; Madar R.; Magana-Villalba R.; Malik S.; Malyshev V. L.; Maravin Y.; Martinez-Ortega J.; McCarthy R.; McGivern C. L.; Meijer M. M.; Melnitchouk A.; Menezes D.; Mercadante P. G.; Merkin M.; et al.

2012-05-04T23:59:59.000Z

284

Revealing dressed-quarks via the proton's charge distribution  

E-Print Network (OSTI)

The proton is arguably the most fundamental of Nature's readily detectable building blocks. It is at the heart of every nucleus and has never been observed to decay. It is nevertheless a composite object, defined by its valence-quark content: u+u+d -- i.e., two up (u) quarks and one down (d) quark; and the manner by which they influence, inter alia, the distribution of charge and magnetisation within this bound-state. Much of novelty has recently been learnt about these distributions; and it now appears possible that the proton's momentum-space charge distribution possesses a zero. Experiments in the coming decade should answer critical questions posed by this and related advances; and we explain how such new information may assist in charting the origin and impact of key emergent phenomena within the strong interaction. Specifically, we show that the possible existence and location of a zero in the proton's electric form factor are a measure of nonperturbative features of the quark-quark interaction in the Standard Model, with particular sensitivity to the running of the dressed-quark mass.

Ian C. Cloet; Craig D. Roberts; Anthony W. Thomas

2013-04-03T23:59:59.000Z

285

Im Botanischen Garten des Instituts fr Biologie und Umweltwissenschaften der Fakultt fr Mathematik und Naturwissenschaften ist zum  

E-Print Network (OSTI)

Im Botanischen Garten des Instituts für Biologie und Umweltwissenschaften der Fakultät für Leiters (E 10 TV-L) unbefristet zu besetzen. Der Botanische Garten umfasst eine Fläche von ca. 5 ha. Zentrale Aufgaben des Gartens sind die Unterstützung bei Forschung und Lehre verschiedener, biologisch

Oldenburg, Carl von Ossietzky Universität

286

16. Heavy-Quark and Soft-Collinear Effective Theory 1 16. Heavy-Quark and Soft-Collinear Effective Theory  

E-Print Network (OSTI)

16. Heavy-Quark and Soft-Collinear Effective Theory 1 16. Heavy-Quark and Soft-Collinear Effective the quantum fluctuations of such heavy particles are "integrated out" from the generating functional integral.lbl.gov) February 16, 2012 14:07 #12;2 16. Heavy-Quark and Soft-Collinear Effective Theory 16.2. Heavy

287

Comment on the paper "Energy Loss of Charm Quarks in the Quark-Gluon Plasma : Collisional vs Radiative"  

E-Print Network (OSTI)

In the article by M. G. Mustafa published in Phys. Rev. C {\\bf 72}, 014905 (2005) the author has estimated the total energy loss of a charm quark and quenching of hadron spectra due to the collisional energy loss of energetic partons in an expanding quark-gluon plasma employing Fokker-Planck equation. We wish to point out through this comment that some of conceptual and numerical results of the said paper are unreliable.

Mishra, M; Patra, B K

2007-01-01T23:59:59.000Z

288

QuarkNet Workshop: Beyond Human Error  

NLE Websites -- All DOE Office Websites (Extended Search)

Human Error Human Error QuarkNet Workshop for High School Science Teachers 8:30 am to 4:00 pm, August 1 -3, 2012 at Fermi National Accelerator Laboratory This was a three-day workshop for high school science teachers. Measurement and error are key ingredients for all science applications. Both align with the Next Generation Science Standards, but many high school students struggle to understand the importance of error analysis and prevention. Over the three days we examined multiple experiments going on at Fermilab and discussed the ways that scientists take measurements and reduce error on these projects. Participants met and worked with scientists from Fermilab and University of Chicago to look at how error analysis takes place at Fermilab and bridged those ideas into high school classes. Teachers discussed lesson plans available at Fermilab and their own methods of teaching error analysis. Additionally, participants heard from high school students who participated in summer research as they presented their findings and linked students' learning back to the teachers' understanding of error recognition and analysis.

289

Measurement of b-quark Jet Shapes at CDF  

SciTech Connect

The main topic of this thesis is the measurement of b-quark jet shapes at CDF. CDF is an experiment located at Fermilab, in the United States, which studies proton-antiproton collisions at a center of mass energy of 1.96TeV. To reach this energy, the particles are accelerated using the Tevatron accelerator which is currently the highest energy collider in operation. The data used for this analysis were taken between February 2002 and September 2004 and represent an integrated luminosity of about 300 pb{sup -1}. This is the first time that b-quark jet shapes have been measured at hadron colliders. The basis of this measurement lies in the possibility of enhancing the b-quark jet content of jet samples by requiring the jets to be identified as having a displaced vertex inside the jet cone. Such jets are called tagged. This enhances the b-quark jet fraction from about 5% before tagging to 20-40% after tagging, depending on the transverse momentum of the jets. I verified that it is possible to apply this secondary vertex tagging algorithm to different cone jet algorithms (MidPoint and JetClu) and different cone sizes (0.4 and 0.7). I found that the performance of the algorithm does not change significantly, as long as the sub-cone inside which tracks are considered for the tagging is kept at the default value of 0.4. Because the b-quark purity of the jets is still relatively low, it is necessary to extract the shapes of b-quark jets in a statistical manner from the jet shapes both before and after tagging. The other parameters that enter into the unfolding equation used to extract the b-quark jet shapes are the b-jet purities, the biases due to the tagging requirement both for b- and nonbjets and the hadron level corrections. The last of these terms corrects the measured b-jet shapes back to the shapes expected at hadron level which makes comparisons with theoretical models and other experimental results possible. This measurement shows that, despite relatively large systematic uncertainties, the measured b-quark jet shapes are significantly different from those expected from the so-called Pythia Tune A Monte Carlo simulation, the most widely used Leading Order Monte Carlo model at CDF. This difference can be mostly attributed to the fact that the fraction of b-quark jets that originate from flavour creation (where a single b-quark is expected inside the same jet cone) over those that originate from gluon splitting (where two b-quarks are expected to be inside the same jet cone) is slightly different in the Pythia Tune A Monte Carlo predictions than in data. This measurement can help in the tuning of the fraction of gluon splitting to flavour creation b-quark jets in the Monte Carlo simulation. This tuning is particularly important for the extrapolation up to LHC energies where many searches will involve b-quark jets. During the first year of my thesis work, I worked on the implementation of a prototype detector control system for the electromagnetic calorimeter which is being built for the CMS experiment at CERN. The prototype which I implemented was used to monitor and control the high voltage, low voltage, cooling and precision temperature monitoring systems during the summer 2003 test-beam. This was one of the first, almost complete, systems implemented and used by an LHC experiment for test-beam monitoring.

Lister, Alison; /Zurich, ETH

2006-03-01T23:59:59.000Z

290

Top quark pair production in proton anti-proton collisions  

Science Conference Proceedings (OSTI)

This thesis presents a measurement of the t{bar t} cross section in the all-jets channel, measured in p{bar p} collisions at a center of mass energy of 1.96 TeV, using data collected with the D0 detector. The dataset used for this analysis has an integrated luminosity equivalent to L = 162.5 {+-} 10.6 pb{sup -1}. A t{bar t} cross section measurement is a test of the Standard Model predictions for heavy quark production, and the first step towards measurements of the mass and other properties of the top quark. The presented measurement of the cross section for the process p{bar p} {yields} t{bar t} uses the decay channel where both top quarks decay to quarks. The top quark first decays to a b quark and a W boson, and then, for this particular channel, the W boson decays hadronically. Hence, events with six energetic quarks are expected, which ideally leads to events with six jets. These so called all-jets events have a significantly larger branching fraction than other t{bar t} decay channels. The large branching fraction in the all-jets channel means that a significant sample of t{bar t} candidates can be extracted, which can subsequently be used for studies of top quark properties, like the top mass. The background, multijet production through Quantum Chromo Dynamics (QCD) has a cross section three to four orders of magnitude larger than expected for t{bar t} production. The analysis presented in this thesis uses the decay vertices of long-lived b-flavored mesons to identify the b jets. With the silicon detector installed at the start of Run 2 of the Tevatron, the D0 experiment is now able to use this method for b identification. The presence of b quarks in the event makes it possible to reduce the background to a few percent of the original sample, while only rejecting around 45% of the t{bar t} content in the sample.

Blekman, Freya; /NIKHEF, Amsterdam

2005-04-01T23:59:59.000Z

291

Non-leptonic decays in an extended chiral quark model  

Science Conference Proceedings (OSTI)

We consider the color suppressed (nonfactorizable) amplitude for the decay mode B{sub d}{sup 0}{yields}{pi}{sup 0}{pi}{sup 0}. We treat the b-quark in the heavy quark limit and the energetic light (u,d,s) quarks within a variant of Large Energy Effective Theory combined with an extension of chiral quark models. Our calculated amplitude for B{sub d}{sup 0}{yields}{pi}{sup 0}{pi}{sup 0} is suppressed by a factor of order {Lambda}{sub QCD}/m{sub b} with respect to the factorized amplitude, as it should according to QCD-factorization. Further, for reasonable values of the (model dependent) gluon condensate and the constituent quark mass, the calculated nonfactorizable amplitude for B{sub d}{sup 0}{yields}{pi}{sup 0}{pi}{sup 0} can easily accomodate the experimental value. Unfortunately, the color suppressed amplitude is very sensitive to the values of these model dependent parameters. Therefore fine-tuning is necessary in order to obtain an amplitude compatible with the experimental result for B{sub d}{sup 0}{yields}{pi}{sup 0}{pi}{sup 0}.

Eeg, J. O. [Dept. of Physics, Univ. of Oslo, P.O. Box 1048 Blindern, N-0316 Oslo (Norway)

2012-10-23T23:59:59.000Z

292

Determination of the width of the top quark  

SciTech Connect

We extract the total width of the top quark, {Lambda}{sub t}, from the partial decay width {Lambda}(t {yields} Wb) measured using the t-channel cross section for single top quark production and from the branching fraction B(t {yields} Wb) measured in t{bar t} events using up to 2.3 fb{sup -1} of integrated luminosity collected by the D0 Collaboration at the Tevatron p{bar p} Collider. The result is {Lambda}{sub t} = 1.99{sub -0.55}{sup +0.69} GeV, which translates to a top-quark lifetime of {tau}{sub t} = (3.3{sub -0.9}{sup +1.3}) x 10{sup -25} s. Assuming a high mass fourth generation b{prime} quark and unitarity of the four-generation quark-mixing matrix, we set the first upper limit on |V{sub tb{prime}}| < 0.63 at 95% C.L.

Abazov, Victor Mukhamedovich; /Dubna, JINR; Abbott, Braden Keim; /Oklahoma U.; Abolins, Maris A.; /Michigan State 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 /Nijmegen U.

2010-09-01T23:59:59.000Z

293

An Improved determination of the width of the top quark  

SciTech Connect

We present an improved determination of the total width of the top quark, {Lambda}{sub t}, using 5.4 fb{sup -1} of integrated luminosity collected by the D0 Collaboration at the Tevatron p{bar p} Collider. The total width {Lambda}{sub t} is extracted from the partial decay width {Lambda}(t {yields} Wb) and the branching fraction {Beta}(t {yields} Wb). {Lambda}(t {yields} Wb) is obtained from the t-channel single top quark production cross section and {Beta}(t {yields} Wb) is measured in t{bar t} events. For a top mass of 172.5 GeV, the resulting width is {Lambda}{sub t} = 2.00{sub -0.43}{sup +0.47} GeV. This translates to a top-quark lifetime of {tau}{sub t} = (3.29{sub -0.63}{sup +0.90}) x 10{sup -25} s. We also extract an improved direct limit on the CKM matrix element 0.81 < |V{sub tb}| {le} 1 at 95% C.L. and a limit of |V{sub tb'}| < 0.59 for a high mass fourth generation bottom quark assuming unitarity of the fourth generation quark mixing matrix.

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.; Aoki, Masato; /Fermilab; Askew, Andrew Warren; /Florida State U. /Stockholm U.

2012-01-01T23:59:59.000Z

294

Measurements of the top quark mass and decay width with the D0 detector  

SciTech Connect

The top quark discovery in 1995 at Fermilab is one of the major proofs of the standard model (SM). Due to its unique place in SM, the top quark is an important particle for testing the theory and probing for new physics. This article presents most recent measurements of top quark properties from the D0 detector. In particular, the measurement of the top quark mass, the top antitop mass difference and the top quark decay width. The discovery of the top quark in 1995 confirmed the existence of a third generation of quarks predicted in the standard model (SM). Being the heaviest elementary particle known, the top quark appears to become an important particle in our understanding of the standard model and physics beyond it. Because of its large mass the top quark has a very short lifetime, much shorter than the hadronization time. The predicted lifetime is only 3.3 {center_dot} 10{sup -25}s. Top quark is the only quark whose properties can be studied in isolation. A Lorentz-invariant local Quantum Field Theory, the standard model is expected to conserve CP. Due to its unique properties, the top quark provides a perfect test of CPT invariance in the standard model. An ability to look at the quark before being hadronized allows to measure directly mass of the top quark and its antiquark. An observation of a mass difference between particle and antiparticle would indicate violation of CPT invariance. Top quark through its radiative loop correction to the W mass constrains the mass of the Higgs boson. A precise measurement of the top quark mass provides useful information to the search of Higgs boson by constraining its region of possible masses. Another interesting aspect is that the top quark's Yukawa coupling to the Higgs boson is very close to unity (0.996 {+-} 0.006). That implies it may play a special role in the electroweak symmetry breaking mechanism.

Ilchenko, Yuriy

2011-11-01T23:59:59.000Z

295

Measurements of the Properties of the Top Quark  

Science Conference Proceedings (OSTI)

We review recent measurements of the properties of the top quark: the decay width of the top quark, of spin correlations between the top and the antitop quarks in t{bar t} production, the W boson helicity in top decays, the strong colour flow in t{bar t} events, and the asymmetry of t{bar t} production due to the strong colour charge. The measurements are performed on data samples of up to 5.4 fb{sup -1} of integrated luminosity acquired by the CDF and D0 collaborations in Run II of the Fermilab Tevatron p{bar p} collider at a centre-of-mass energy of {radical}s = 1.96 TeV.

Brandt, Oleg

2011-08-01T23:59:59.000Z

296

Quark Stars as inner engines for Gamma Ray Bursts?  

E-Print Network (OSTI)

A model for Gamma ray bursts inner engine based on quark stars (speculated to exist in nature) is presented. We describe how and why these objects might constitute new candidates for GRB inner engines. At the heart of the model is the onset of exotic phases of quark matter at the surface of such stars, in particular the 2-flavor color superconductivity. A novel feature of such a phase is the generation of particles which are unstable to photon decay providing a natural mechanism for a fireball generation; an approach which is fundamentally different from models where the fireball is generated during collapse or conversion of neutron star to quark star processes. The model is capable of reproducing crucial features of Gamma ray bursts, such as the episodic activity of the engine (multiple and random shell emission) and the two distinct categories of the bursts (two regimes are isolated in the model with \\sim 2 s and \\sim 81 s burst total duration).

R. Ouyed; F. Sannino

2001-03-01T23:59:59.000Z

297

Electrical conductivity of quark matter at finite T  

E-Print Network (OSTI)

In this talk, I present the recent theoretical results on the electrical conductivity (EC) sigma of quark matter, using the Kubo formula at finite temperature and zero quark density (T>0, mu=0) in the presence of an external strong magnetic field. The dilute instanton-liquid model with the caloron distribution is taken into account. It turns out that sigma=(0.02~0.15)/fm for T=(0~400) MeV with the relaxation time tau=(0.3~0.9) fm. EC is parameterized as sigma/T (0.46,0.77,1.08,1.39)C_EM for tau=(0.3,0.5,0.7,0.9) fm, respectively. These results are well compatible with other theoretical estimations and show almost negligible effects from the magnetic field. The soft photon emission rate from the quark-gluon plasma is discussed as well.

Seung-il Nam

2012-10-30T23:59:59.000Z

298

Strangeness at high temperatures: from hadrons to quarks  

E-Print Network (OSTI)

Appropriate combinations of up to fourth order cumulants of net strangeness fluctuations and their correlations with net baryon number and electric charge fluctuations, obtained from lattice QCD calculations, have been used to probe the strangeness carrying degrees of freedom at high temperatures. For temperatures up to the chiral crossover separate contributions of strange mesons and baryons can be well described by an uncorrelated gas of hadrons. Such a description breaks down in the chiral crossover region, suggesting that the deconfinement of strangeness takes place at the chiral crossover. On the other hand, the strangeness carrying degrees of freedom inside the quark gluon plasma can be described by a weakly interacting gas of quarks only for temperatures larger than twice the chiral crossover temperature. In the intermediate temperature window these observables show considerably richer structures, indicative of the strongly interacting nature of the quark gluon plasma.

A. Bazavov; H. -T. Ding; P. Hegde; O. Kaczmarek; F. Karsch; E. Laermann; Y. Maezawa; Swagato Mukherjee; H. Ohno; P. Petreczky; C. Schmidt; S. Sharma; W. Soeldner; M. Wagner

2013-04-26T23:59:59.000Z

299

Quark mass variation constraints from Big Bang nucleosynthesis  

SciTech Connect

We study the impact on the primordial abundances of light elements created of a variation of the quark masses at the time of Big Bang nucleosynthesis (BBN). In order to navigate through the particle and nuclear physics required to connect quark masses to binding energies and reaction rates in a model-independent way we use lattice QCD data and an hierarchy of effective field theories. We find that the measured {sup 4}He abundances put a bound of {delta}-1% {approx}< m{sub q}/m{sub 1} {approx}< 0.7%. The effect of quark mass variations on the deuterium abundances can be largely compensated by changes of the baryon-to-photon ratio {eta}. Including the bounds on the variation of {eta} coming from WMAP results and some additional assumptions narrows the range of allowed values of {delta}m{sub q}/m{sub q} somewhat.

Bedaque, P; Luu, T; Platter, L

2010-12-13T23:59:59.000Z

300

A Zip-code for Quarks, Leptons and Higgs Bosons  

E-Print Network (OSTI)

The location of matter fields and the pattern of gauge symmetry in extra dimensions are crucial ingredients for string model building. We analyze realistic MSSM models from the heterotic Z6 Mini-Landscape and extract those properties that are vital for their success. We find that Higgs bosons and the top quark are not localized in extra dimensions and live in the full D=10 dimensional space-time. The first two families of quarks and leptons, however, live at specific fixed points in extra dimensional space and exhibit a (discrete) family symmetry. Within a newly constructed Z2XZ4 orbifold framework we further elaborate on these location properties and the appearance of discrete symmetries. A similar geometrical picture emerges. This particular Zip-code for quarks, leptons and Higgs bosons seems to be of more general validity and thus a useful guideline for realistic model building in string theory.

Damian Kaloni Mayorga Pena; Hans Peter Nilles; Paul-Konstantin Oehlmann

2012-09-26T23:59:59.000Z

Note: This page contains sample records for the topic "quarks und leptonen" 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

Nucleation of quark matter in the PQM model  

SciTech Connect

We use Langer's theory to calculate the surface tension of critical bubbles in a first-order quark-hadron phase transition at moderate and high baryon chemical potential, as predicted by the Polyakov-Quark-Meson (PQM) model at the mean-field level. We define an effective 4-dimensional order parameter, which is used to overestimate the surface tension of nucleating bubbles within the thin-wall approximation. We find relatively low values for the surface tension, {Sigma} Less-Than-Or-Equivalent-To 15MeV/fm{sup 2}. This implies that a metastable state, such as a supercooled quark-gluon plasma (QGP), quickly decays even in regions relatively close to the coexistence line of the phase diagram. Possible consequences for cosmology are briefly outlined.

Mintz, Bruno W. [Instituto de Fisica, Universidade Federal do Rio de Janeiro, Caixa Postal 68528, Rio de Janeiro, RJ 21945-970 (Brazil); Stiele, Rainer; Schaffner-Bielich, Juergen [Institut fuer Theoretische Physik, Ruprecht-Karls-Universitaet, Philosophenweg 16, D-69120, Heidelberg, Germany and ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum fuer Schwerionenforschung GmbH, Planckstrasse 1, D-64291 D (Germany); Ramos, Rudnei O. [Departamento de Fisica Teorica, Universidade do Estado do Rio de Janeiro, 20550-013 Rio de Janeiro, RJ (Brazil)

2013-03-25T23:59:59.000Z

302

Measurements of the Top Quark at the Tevatron Collider  

SciTech Connect

The authors present recent preliminary measurements of the top-antitop pair production cross section and determinations of the top quark pole mass, performed using the data collected by the CDF and D0 Collaborations at the Tevatron Collider. In the lepton plus jets final state, with semileptonic B decay, the pair production cross section has now been measured at CDF using {approx} 760 pb{sup -1} of proton-antiproton collisions at a center-of-mass energy of {radical}s = 1.96 TeV. A measurement of the production cross section has also been made with {approx} 1 fb{sup -1} of data in the all-jets final state by the CDF Collaboration. The mass of the top quark has now been measured using {approx} 1 fb{sup -1} of collision data using all decay channels of the top quark pair, yielding the most precise measurements of the top mass to date.

Cerrito, Lucio; /Queen Mary, U. of London

2007-01-01T23:59:59.000Z

303

Krankheiten, Fortpflanzung und Immobilisation der Tiger (Panthera tigris) im Zoologischen Garten Leipzig unter besonderer Bercksichtigung der "Tigerkrankheit".  

E-Print Network (OSTI)

??Veterinrmedizinische Fakultt, Universitt Leipzig, und Zoo Leipzig Die Krankheiten, Fortpflanzung und Immobilisation der Tiger des fr seine Zucht berhmten Leipziger Zoologischen Gartens wurden zusammenfassend ber (more)

Vollrath, Constance

2009-01-01T23:59:59.000Z

304

Presseinformation Presse und Kommunikation Leiterin: Dr. Elisabeth Zuber-Knost  

E-Print Network (OSTI)

Weltgeltung im Forschungsschwerpunkt Energie des Forschungs- zentrums genie?en die Arbeiten zur Programme Erneuerbare Energien und Rationelle Energieumwandlung erhalten durch die Zusammenführung mit den

305

HEAVY BARYONS: A COMBINED LARGE Nc AND HEAVY QUARK EXPANSION FOR ELECTROWEAK CURRENTS  

E-Print Network (OSTI)

The combined large Nc and heavy quark limit for baryons containing a single heavy quark is discussed. The combined large Nc and heavy quark expansion of the heavy quark bilinear operators is obtained. In the combined expansion the corrections proportional to mN/mQ are summed to all orders. In particular, the combined expansion can be used to determine semileptonic form factors of heavy baryons in the combined limit. 1

Boris A. Gelman

2002-01-01T23:59:59.000Z

306

Integral equation for gauge invariant quark Green's function  

E-Print Network (OSTI)

We consider gauge invariant quark two-point Green's functions in which the gluonic phase factor follows a skew-polygonal line. Using a particular representation for the quark propagator in the presence of an external gluon field, functional relations between Green's functions with different numbers of segments of the polygonal lines are established. An integral equation is obtained for the Green's function having a phase factor along a single straight line. The related kernels involve Wilson loops with skew-polygonal contours and with functional derivatives along the sides of the contours.

H. Sazdjian

2008-06-20T23:59:59.000Z

307

Meson properties in a nonlocal SU(3) chiral quark model at finite temperature  

SciTech Connect

Finite temperature meson properties are studied in the context of a nonlocal SU(3) quark model which includes flavor mixing and the coupling of quarks to the Polyakov loop (PL). We analyze the behavior of scalar and pseudoscalar meson masses and mixing angles, as well as quark-meson couplings and pseudoscalar meson decay constants.

Contrera, G. A. [CONICET, Rivadavia 1917, 1033 Buenos Aires (Argentina); Physics Department, Centro Atomico Constituyentes, Buenos Aires (Argentina); Gomez Dumm, D. [CONICET, Rivadavia 1917, 1033 Buenos Aires (Argentina); IFLP, Dpto. de Fisica, Universidad Nacional de La Plata, C.C. 67, (1900) La Plata (Argentina); Scoccola, N. N. [CONICET, Rivadavia 1917, 1033 Buenos Aires (Argentina); Universidad Favaloro, Solis 453, 1078 Buenos Aires (Argentina)

2010-11-12T23:59:59.000Z

308

Top quarks at the Tevatron: Measurements of the top quark production and decay with the D0 experiment  

Science Conference Proceedings (OSTI)

This thesis presents two measurements of the to pquark using 230 pb{sup -1} of data recorded with the D0 detector at the Tevatron accelerator. The first measurement determines the top pair production cross section at {radical}s = 1.96 TeV in proton-antiproton collisions. In the standard model of particle physics the top quark decays almost exclusively into a W boson and a b quark. Candidate events are selected by requiring that at least one jet in the event is tagged with the secondary vertex algorithm.

Strandberg, Jonas; /Stockholm U.

2006-04-01T23:59:59.000Z

309

Glucose Metabolismus und Muskelfaseratrophie in der Frhphase der Critical Illness Myopathie.  

E-Print Network (OSTI)

??Hintergrund: Critical-Illness-Myopathie (CIM) ist eine erworbene Muskelerkrankung mit unbekannter tiologie und ohne wirksame Behandlung. Sie zeichnet sich durch eine schlaffe Lhmung der Skelettmuskulatur und der (more)

Schneider, Joanna Barbara

2014-01-01T23:59:59.000Z

310

Felsenwand vs. Blumental: Fremdwahrnehmung und Selbststilisierung in J.G. Seumes Mein Sommer 1805  

E-Print Network (OSTI)

In: Schillers Werke. Bd. 2.I, hrsg. v. Norbert Oellers u.a.Anne und Theo Harden [Hrsg. ]: Reisen im Diskurs. ModelleAnne und Theo Harden [Hrsg. ]: Reisen im Diskurs. Modelle

Starzinger, Jakob

2005-01-01T23:59:59.000Z

311

QuarkNet/Walta/CROP Cosmic Ray Detectors  

E-Print Network (OSTI)

QuarkNet/Walta/CROP Cosmic Ray Detectors User's Manual Jeff Rylander and Tom Jordan, Fermilab R. J. Project Development Team Fermilab: Sten Hansen, Tom Jordan, Terry Kiper Univeristy of Nebraska: Dan Claes energies. However, it is possi- ble to do high-energy physics in your school without a particle accelerator

California at Santa Cruz, University of

312

An Introduction to the Heavy Quark Effective Theory  

E-Print Network (OSTI)

These lecture notes begin with a brief survey of the physics of heavy quark systems. This discusion motivates the introduction of the Heavy Quark Effective theory (HQET) which captures a great deal of the intuition developed. A derivation of the HQET from QCD is presented as well as an analysis of its special properties. The effective theory can be seen to amount to a one-dimensional field theory in the quark sector. The heavy quark flavour- and spin- symmetry of the effective lagrangian is an offspring of this. Other topics covered include the question of covariance of the theory, the construction of interpolating fields for the heavy hadron states, the application of LSZ reduction theorems to determine the (reduced) number of form factors in flavour changing transitions, a complete verification of Luke's theorem, plus the matching conditions between QCD and the HQET beyond tree level. These are an expanded version of lectures presented during the Trieste 1994 Summer school on High Energy physics.

F. Hussain; G. Thompson

1995-02-07T23:59:59.000Z

313

Precision Top-Quark Mass Measurements at CDF  

Science Conference Proceedings (OSTI)

We present a precision measurement of the top-quark mass using the full sample of Tevatron {radical}s = 1.96 TeV proton-antiproton collisions collected by the CDF II detector, corresponding to an integrated luminosity of 8.7 fb{sup -1}. Using a sample of t{bar t} candidate events decaying into the lepton+jets channel, we obtain distributions of the top-quark masses and the invariant mass of two jets from the W boson decays from data. We then compare these distributions to templates derived from signal and background samples to extract the top-quark mass and the energy scale of the calorimeter jets with in situ calibration. The likelihood fit of the templates from signal and background events to the data yields the single most-precise measurement of the top-quark mass, mtop = 172.85 {+-} 0.71 (stat) {+-} 0.85 (syst) GeV/c{sup 2}.

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

2012-07-01T23:59:59.000Z

314

Excited quark production at a 100 TeV VLHC  

E-Print Network (OSTI)

I look for a dijet resonance produced by an excited quark q* in a simulated sample corresponding to 3 ab^{-1} of pp collisions at $\\sqrt{s} = 100$ TeV. Using a cut and count analysis approach I demonstrate the potential to explore q* masses up to 50 TeV, corresponding to a length scale of around 4 am.

Jacob Anderson

2013-09-03T23:59:59.000Z

315

Excited quark production at a 100 TeV VLHC  

E-Print Network (OSTI)

I look for a dijet resonance produced by an excited quark q* in a simulated sample corresponding to 3 ab^{-1} of pp collisions at $\\sqrt{s} = 100$ TeV. Using a cut and count analysis approach I am able to explore q* masses up to 50 TeV, corresponding to a length scale of around 4 am.

Anderson, Jacob

2013-01-01T23:59:59.000Z

316

J/Psi Production by Charm Quark Coalescence  

E-Print Network (OSTI)

Production of $c\\bar c$ pairs in elementary hadron-hadron collisions is introduced in a simulation of relativistic heavy ion collisions. Coalescence of charmed quarks and antiquarks into various charmonium states is performed and the results are compared to PHENIX J$/\\psi$ Au+Au data. The $\\chi$ and $\\psi$' bound states must be included as well as the ground state J$/\\psi$, given the appreciable feeding from the excited states down to the J$/\\psi$ via gamma decays. Charmonium coalescence is found to take place at relatively late times: generally after $c$($\\bar c$)-medium interactions have ceased. Direct production of charmonia through hadron-hadron interactions, {\\it ie.} without explicit presence of charm quarks, occurring only at early times, is suppressed by collisions with comoving particles and accounts for some $\\sim 5\\%$ of the total J$/\\psi$ production. Coalescence is especially sensitive to the level of open charm production, scaling naively as $n_{c\\bar c}^2$. The J$/\\psi$ transverse momentum distribution is dependent on the charm quark transverse momentum distribution and early charm quark-medium interaction, thus providing a glimpse of the initial collision history.

D. E. Kahana; S. H. Kahana

2010-06-30T23:59:59.000Z

317

A top quark mass measurement using a matrix element method  

Science Conference Proceedings (OSTI)

A measurement of the mass of the top quark is presented, using top-antitop pair (t{bar t}) candidate events for the lepton+jets decay channel. The measurement makes use of Tevatron p{bar p} collision data at centre-of-mass energy {radical}s = 1.96 TeV, collected at the CDF detector. The top quark mass is measured by employing an unbinned maximum likelihood method where the event probability density functions are calculated using signal (t{bar t}) and background (W+jets) matrix elements, as well as a set of parameterised jet-to-parton mapping functions. The likelihood function is maximised with respect to the top quark mass, the fraction of signal events, and a correction to the jet energy scale (JES) of the calorimeter jets. The simultaneous measurement of the JES correction ({Delta}{sub JES}) provides an in situ jet energy calibration based on the known mass of the hadronically decaying W boson. Using 578 lepton+jets candidate events corresponding to 3.2 fb{sup -1} of integrated luminosity, the top quark mass is measured to be m{sub t} = 172.4 {+-} 1.4 (stat+{Delta}{sub JES}) {+-} 1.3 (syst) GeV=c{sup 2}, one of the most precise single measurements to date.

Linacre, Jacob Thomas; /Oxford U.

2010-02-01T23:59:59.000Z

318

How does gluon string split into two quark ones  

Science Conference Proceedings (OSTI)

In this paper, the authors assume that gluon string splits into two quark ones and not instantaneously but via creation of the so-called zip-antizip pairs along the gluon string. This additional stage prolongs hadronization process and gives the novel source of fluctuations that softens hadron z-spectrum and widens the multiplicity distribution.

Gurvich, E.G.; Leptoukh, G.G. (Inst. of Physics of the Georgian Academy of Sciences, Tamarashvili 6, Tbilisi (USSR))

1992-09-28T23:59:59.000Z

319

On the Dynamics of Unstable Quark-Gluon Plasma  

E-Print Network (OSTI)

Since the quark-gluon plasma, which is unstable due to anisotropic momentum distribution, evolves fast in time, plasma's characteristics have to be studied as initial value problems. The chromodynamic fluctuations and the momentum broadening of a fast parton traversing the plasma are discussed here. The two quantities are shown to exponentially grow in time.

Stanislaw Mrowczynski

2009-10-30T23:59:59.000Z

320

HIGGS BOSON PRODUCTION IN ASSOCIATION WITH BOTTOM QUARKS.  

SciTech Connect

In the Standard Model, the coupling of the Higgs boson to b quarks is weak, leading to small cross sections for producing a Higgs boson in association with b quarks. However, Higgs bosons with enhanced couplings to b quarks, such as occur in supersymmetric models for large values of tan {beta}, will be copiously produced at both the Tevatron and the LHC in association with b quarks which will be an important discovery channel. We investigate the connections between the production channels, bg {yields} bh and gg {yields} b{bar b}h, at next-to-leading order (NLO) in perturbative QCD and present results for the case with two high-p{sub T} b jets and with one high-p{sub T} b jet at both the Tevatron and the LHC. Finally, the total cross sections without cuts are compared between gg {yields} b{bar b}h at NLO and b{bar b} {yields} h at NNLO.

DAWSON, S.; CAMPBELL, J.; DITTMAIER, S.; JACKSON, C.; KRAMER, M.; MALTONI, F.; ET AL.

2003-05-26T23:59:59.000Z

Note: This page contains sample records for the topic "quarks und leptonen" 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

Influence of pions on the hadron-quark phase transition  

SciTech Connect

In this work we present the features of the hadron-quark phase transition diagrams in which the pions are included in the system. To construct such diagrams we use two different models in the description of the hadronic and quark sectors. At the quark level, we consider two distinct parametrizations of the Polyakov-Nambu-Jona-Lasinio (PNJL) models. In the hadronic side, we use a well known relativistic mean-field (RMF) nonlinear Walecka model. We show that the effect of the pions on the hadron-quark phase diagrams is to move the critical end point (CEP) of the transitions lines. Such an effect also depends on the value of the critical temperature (T{sub 0}) in the pure gauge sector used to parametrize the PNJL models. Here we treat the phase transitions using two values for T{sub 0}, namely, T{sub 0}= 270 MeV and T{sub 0}= 190 MeV. The last value is used to reproduce lattice QCD data for the transition temperature at zero chemical potential.

Lourenco, O.; Dutra, M.; Frederico, T.; Malheiro, M. [Departamento de Fisica, Instituto Tecnologico de Aeronautica-CTA, 12228-900, Sao Jose dos Campos (Brazil); Delfino, A. [Instituto de Fisica, Universidade Federal Fluminense, Av. Litoranea s/n, 24210-150, Boa Viagem, Niteroi RJ (Brazil)

2013-05-06T23:59:59.000Z

322

Phase transitions in quark matter under strong magnetic fields  

SciTech Connect

In this work we use de SU(2) Nambu-Jona-Lasinio model to study the chiral transition at finite temperature, chemical potential and magnetic field. We show how the magnetic field affects the location of the critical end-point in the phase diagram, the constituent quark masses and the spinodal lines concerning the first order transition.

Garcia, Andre F.; Pinto, Marcus B. [Physics Department, Universidade Federal de Santa Catarina (Brazil)

2013-03-25T23:59:59.000Z

323

Unlike Particle Correlations and the Strange Quark Matter Distillation Process  

E-Print Network (OSTI)

We present a new technique for observing the strange quark matter distillation process based on unlike particle correlations. A simulation is presented based on the scenario of a two-phase thermodynamical evolution model. on leave from University of Nantes, U.M.R. Subatech

D. Ardouin; Sven Soff; C. Spieles; S. A. Bass; H. Stcker; D. Gourio; S. Schramm; C. Greiner; R. Lednicky; V. L. Lyuboshitz; J. -p. Coffin; C. Kuhn

2002-01-01T23:59:59.000Z

324

Mein Auslandssemester in England Nachdem die ganzen Formalitten erledigt waren, und ich dachte immer die Deutsche  

E-Print Network (OSTI)

unternommen. Von Afternoontea im Vermont über Museumsbesuche und Strandausflüge war alles dabei. Apropos

Greifswald, Ernst-Moritz-Arndt-Universität

325

Heavy-quark free energy at finite temperature with 2+1 flavors of improved Wilson quarks in fixed scale approach  

E-Print Network (OSTI)

The free energy between a static quark and an antiquark is studied by using the color-singlet Polyakov-line correlation at finite temperature. We perform simulations on $32^3 \\times 12$, 10, 8, 6, 4 lattices in the high temperature phase with the RG-improved gluon action and 2+1 flavors of the clover-improved Wilson quark action. Since the simulations are based on the fixed scale approach that the temperature can be varied without changing the spatial volume and renormalization factor, it is possible to investigate temperature dependence of the heavy-quark free energy without any adjustment of the overall constant. We find that, the heavy-quark free energies at short distance converge to the heavy-quark potential evaluated from the Wilson-loop operator at zero temperature, in accordance with the expected insensitivity of short distance physics to the temperature. At long distance, the heavy-quark free energies approach to twice the single-quark free energies, implying that the interaction between heavy quarks is screened. The Debye screening mass obtained from the long range behavior of the heavy-quark free energy is compared with results of the thermal perturbation theory and those of $N_f=2$ and $N_f=0$ lattice simulations.

Y. Maezawa; S. Aoki; S. Ejiri; T. Hatsuda; K. Kanaya; H. Ohno; T. Umeda

2009-11-02T23:59:59.000Z

326

Uncovering the single top: observation of electroweak top quark production  

Science Conference Proceedings (OSTI)

The top quark is generally produced in quark and anti-quark pairs. However, the Standard Model also predicts the production of only one top quark which is mediated by the electroweak interaction, known as 'Single Top'. Single Top quark production is important because it provides a unique and direct way to measure the CKM matrix element V{sub tb}, and can be used to explore physics possibilities beyond the Standard Model predictions. This dissertation presents the results of the observation of Single Top using 2.3 fb{sup -1} of Data collected with the D0 detector at the Fermilab Tevatron collider. The analysis includes the Single Top muon+jets and electron+jets final states and employs Boosted Decision Tress as a method to separate the signal from the background. The resulting Single Top cross section measurement is: (1) {sigma}(p{bar p} {yields} tb + X, tqb + X) = 3.74{sub -0.74}{sup +0.95} pb, where the errors include both statistical and systematic uncertainties. The probability to measure a cross section at this value or higher in the absence of signal is p = 1.9 x 10{sup -6}. This corresponds to a standard deviation Gaussian equivalence of 4.6. When combining this result with two other analysis methods, the resulting cross section measurement is: (2) {sigma}(p{bar p} {yields} tb + X, tqb + X) = 3.94 {+-} 0.88 pb, and the corresponding measurement significance is 5.0 standard deviations.

Benitez, Jorge Armando; /Michigan State U.

2009-08-01T23:59:59.000Z

327

Questions and Answers - What kinds of quarks are protons and neutrons made  

NLE Websites -- All DOE Office Websites (Extended Search)

How many quarks are inprotons and neutrons? How many quarks are in<br>protons and neutrons? Previous Question (How many quarks are in protons and neutrons?) Questions and Answers Main Index Next Question (What is the charge of an up quark and of down quark?) What is the charge of an up quarkand of down quark? What kinds of quarks are protons and neutrons made of? What was the old name for the Top and Bottom quark? Protons are made of two Up and one Down quark. The neutron is made of two Down and one Up quark. The Up quarks have a 2/3 positive charge and the Down has a 1/3 negative charge. Fractional charges are a pretty funny concept, but remember we (humans) made up the unit of charge that a proton has, so its very possible that there could be a smaller division of charge. If you add those charges you will see that sum is positive one for the

328

Early thermalization of quark-gluon matter initially created in high-energy nucleus-nucleus collisions  

E-Print Network (OSTI)

Elastic parton-parton-parton scattering is briefly reviewed and is included in transport equations of quark-gluon matter. We solve the transport equations and get thermal states from initially produced quark-gluon matter. Both gluon matter and quark matter take early thermalization, but gloun matter has a shorter thermalization time than quark matter.

Xu, Xiao-Ming

2013-01-01T23:59:59.000Z

329

Nonperturbative enhancement of heavy quark-pair production in a strong SU(2) color field  

Science Conference Proceedings (OSTI)

Nonperturbative charm and bottom quark-pair production is investigated in the early stage of heavy-ion collisions. The time-dependent study is based on a kinetic description of fermion-pair production in strong non-Abelian fields. We introduce a time-dependent chromo-electric external field with a pulselike time evolution to simulate the overlap of two colliding heavy ions. The calculations is performed in a SU(2) color model with finite current quark masses. Yields of heavy quark pairs are compared to the ones of light and strange quark pairs. We show that the small inverse duration time of the field pulse determines the efficiency of the quark-pair production. The expected suppression for heavy quark production, as follows from the Schwinger formula for a constant field, is not seen, but rather an enhanced heavy quark production appears at ultrarelativistic energies.

Levai, Peter; Skokov, Vladimir [KFKI RMKI Research Institute for Particle and Nuclear Physics, P.O. Box 49, Budapest 1525 (Hungary); Gesellschaft fuer Schwerionenforschung mbH, Planckstr. 1, D-64291 Darmstadt (Germany)

2010-10-01T23:59:59.000Z

330

Hadron structure in a simple model of quark/nuclear matter  

SciTech Connect

We study a simple model for one-dimensional hadron matter with many of the essential features needed for examining the transition from nuclear to quark matter and the limitations of models based upon hadron rather than quark degrees of freedom. The dynamics are generated entirely by the quark confining force and exchange symmetry. Using Monte Carlo techniques, the ground-state energy, single-quark momentum distribution, and quark correlation function are calculated for uniform matter as a function of density. The quark confinement scale in the medium increases substantially with increasing density. This change is evident in the correlation function and momentum distribution, in qualitative agreement with the changes observed in deep-inelastic lepton scattering. Nevertheless, the ground-state energy is smooth throughout the transition to quark matter and is described remarkably well by an effective hadron theory based on a phenomenological hadron-hadron potential.

Horowitz, C.J.; Moniz, E.J.; Negele, J.W.

1985-04-01T23:59:59.000Z

331

Nonzero Mean Squared Momentum of Quarks in the Non-Perturbative QCD Vacuum  

E-Print Network (OSTI)

The non-local vacuum condensates of QCD describe the distributions of quarks and gluons in the non-perturbative QCD vacuum. Physically, this means that vacuum quarks and gluons have nonzero mean-squared momentum, called virtuality. In this paper we study the quark virtuality which is given by the ratio of the local quark-gluon mixed vacuum condensate to the quark local vacuum condensate. The two vacuum condensates are obtained by solving Dyson-Schwinger Equations of a fully dressed quark propagator with an effective gluon propagator. Using our calculated condensates, we obtain the virtuality of quarks in the QCD vacuum state. Our numerical predictions differ from the other theoretical model calculations such as QCD sum rules, Lattice QCD and instanton models.

Zhou, Li-Juan; Ma, Wei-xing

2009-01-01T23:59:59.000Z

332

Equation of state in hybrid stars and the stability window of quark matter  

E-Print Network (OSTI)

Properties of hybrid stars with a mixed phase composed of asymmetric nuclear matter and strange quark matter are studied. The quark phase is investigated by the quark quasiparticle model with a self-consistent thermodynamic and statistical treatment. We present the stability windows of the strange quark matter with respect to the interaction coupling constant versus the bag constant. We find that the appearance of the quark-hadron mixed phases is associated with the meta-stable or unstable regions of the pure quark matter parameters. The mass-radius relation of the hybrid star is dominated by the equation of state of quark matter rather than nuclear matter. Due to the appearance of mixed phase, the mass of hybrid star is reduced to 1.64 M$_{\\odot}$ with radius 10.6 km by comparison with neutron star.

Xin-Jian Wen

2013-03-09T23:59:59.000Z

333

Studienplan fr das Fach Chemie und Molekulare Wissenschaften vom 1. September 2008  

E-Print Network (OSTI)

Studienplan für das Fach Chemie und Molekulare Wissenschaften vom 1. September 2008 (revidierte-naturwissenschaftlichen Fakultät vom 14. April 2005 (RSL Phil.-nat., RSL) den folgenden Studienplan für das Fach Chemie und Universität Bern immatrikulierten Studierenden mit Major Chemie und Molekulare Wissenschaften (Bachelor

Mühlemann, Oliver

334

Fachbereiche Physik und Biologie/Chemie Synthesis and Characterisation of Surfaces and  

E-Print Network (OSTI)

Fachbereiche Physik und Biologie/Chemie Synthesis and Characterisation of Surfaces and Interfaces Initiative zur Gr¨undung einer interdisziplin¨aren Graduiertenschule unter Einbeziehung der Physik, Chemie Forschungsschwerpunkte der Materialwissenschaften in den Osnabr¨ucker F¨achern Physik, Chemie und Biologie an und

Osnabrück, Universität

335

Klienten und Server mit TCL Axel-Tobias Schreiner, Universitt Osnabrck  

E-Print Network (OSTI)

Klienten und Server mit TCL Axel-Tobias Schreiner, Universität Osnabrück Im letzten Heft hat Dieter Glau? die Tool Command Language TCL vorgestellt und gezeigt, wie leicht man damit X vielen Erweiterungen, die auf TCL aufbaut und ebenfalls im Netz frei verfügbar ist. Mit tcl-dp kann man

Schreiner, Axel-Tobias

336

Seite 1E-Book-Workshop fur MPG-Bibliothekare E-Books produzieren und publizieren  

E-Print Network (OSTI)

Seite 1E-Book-Workshop fur MPG-Bibliothekare E-Books produzieren und publizieren Bruno Wenk Hochschule für Technik und Wirtschaft HTW Chur Leipzig, 24. Oktober 2012 #12;Seite 2E-Book-Workshop fur MPG-Bibliothekare Ziel Mit kostenlosen Programmen ein E-Book im Format EPUB (2.01) realisieren und im Web publizieren

337

GEORG-AUGUST-UNIVERSITT GTTINGEN Institut fr Forstliche Biometrie und Informatik  

E-Print Network (OSTI)

Allgemeine Angaben 3 2 Zusammenfassung 5 3 Einführung 6 4 Arbeits- und Ergebnisbericht 7 4.1 Ausgangsfragen Blattleitfähigkeiten und Transpirationsraten vorgesehen. #12;- 7 - 4 Arbeits- und Ergebnisbericht 4.1 Ausgangsfragen- chungsjahren wissenschaftliche Hilfskräfte zum Einsatz. #12;- 12 - Für die Blattstiele wurde ein abgewandelter

Kurth, Winfried

338

Searches for new quarks and leptons in Z boson decays  

SciTech Connect

Searches for the decay of Z bosons into pairs of new quarks and leptons in a data sample including 455 hadronic Z decays are presented. The Z bosons were produced in electon-positron annihilations at the SLAC Linear Collider operating in the center-of-mass energy range from 89.2 to 93.0 GeV. The Standard Model provides no prediction for fermion masses and does not exclude new generations of fermions. The existence and masses of these new particles may provide valuable information to help understand the pattern of fermion masses, and physics beyond the Standard Model. Specific searches for top quarks and sequential fourth generation charge--1/3(b{prime}) quarks are made considering a variety of possible standard and non-standard decay modes. In addition, searches for sequential fourth generation massive neutrinos {nu}{sub 4} and their charged lepton partners L{sup {minus}} are pursued. The {nu}{sub 4} may be stable or decay through mixing to the lighter generations. The data sample is examined for new particle topologies of events with high-momentum isolated tracks, high-energy isolated photons, spherical event shapes, and detached vertices. No evidence is observed for the production of new quarks and leptons. 95% confidence lower mass limits of 40.7 GeV/c{sup 2} for the top quark and 42.0 GeV/c{sup 2} for the b{prime}-quark mass are obtained regardless of the branching fractions to the considered decay modes. A significant range of mixing matrix elements of {nu}{sub 4} to other generation neutrinos for a {nu}{sub 4} mass from 1 GeV/c{sup 2} to 43 GeV/c{sup 2} is excluded at 95% confidence level. Measurements of the upper limit of the invisible width of the Z exclude additional values of the {nu}{sub 4} mass and mixing matrix elements, and also permit the exclusion of a region in the L{sup {minus}} mass versus {nu}{sub 4} mass plane.

Van Kooten, R.J.

1990-06-01T23:59:59.000Z

339

Heavy-Quark Free Energy, Debye Mass, and Spatial String Tension at Finite Temperature in Two Flavor Lattice QCD with Wilson Quark Action  

E-Print Network (OSTI)

We study Polyakov loop correlations and spatial Wilson loop at finite Temperature in two-flavor QCD simulations with the RG-improved gluon action and the clover-improved Wilson quark action on a $ 16^3 \\times 4$ lattice. From the line of constant physics at $m_{\\rm PS}/m_{\\rm V}=0.65$ and 0.80, we extract the heavy-quark free energies, the effective running coupling $g_{\\rm eff}(T)$ and the Debye screening mass $m_D(T)$ for various color channels of heavy quark--quark and quark--anti-quark pairs above the critical temperature. The free energies are well approximated by the screened Coulomb form with the appropriate Casimir factors at high temperature. The magnitude and the temperature dependence of the Debye mass are compared to those of the next-to-leading order thermal perturbation theory and to a phenomenological formula in terms of $g_{\\rm eff}(T)$. We make a comparison between our results with the Wilson quark action and the previous results with the staggered quark action. The spatial string tension is also studied in the high temperature phase and is compared to the next-to-next-leading order prediction in an effective theory with dimensional reduction.

WHOT-QCD Collaboration; :; Y. Maezawa; N. Ukita; S. Aoki; S. Ejiri; T. Hatsuda; N. Ishii; K. Kanaya

2007-02-02T23:59:59.000Z

340

16. Heavy-Quark and Soft-Collinear Effective Theory 1 16. Heavy-Quark and Soft-Collinear Effective Theory  

E-Print Network (OSTI)

16. Heavy-Quark and Soft-Collinear Effective Theory 1 16. Heavy-Quark and Soft-Collinear Effective the quantum fluctuations of such heavy particles are "integrated out" from the generating functional integral. Beringer et al.(PDG), PR D86, 010001 (2012) (http://pdg.lbl.gov) June 18, 2012 16:19 #12;2 16. Heavy

Note: This page contains sample records for the topic "quarks und leptonen" 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.


341

Microsoft Word - QuarkNet Friday Flyer.docx  

NLE Websites -- All DOE Office Websites (Extended Search)

Flyer, March 15, 2013 SPECIAL EDITION Flyer, March 15, 2013 SPECIAL EDITION QuarkNet Workshops Since 1999, QuarkNet has introduced teachers to inquiry-based investigations using particle physics data. Select workshops from this menu for your center programs. Contacts can answer your questions and schedule a workshop. Teaching and Learning Workshop (2-3 days) - Contact Tom: jordant@fnal.gov This workshop introduces teachers to inquiry-based resources that incorporate particle physics content. We tailor this workshop to the needs and interests of the center and provide teachers with investigations that can be used in a high school classroom. The following workshops prepare teachers to facilitate data analysis for students, from scaffolding to investigation and reporting using different datasets.

342

Measurements of the top quark mass at the Tevatron  

Science Conference Proceedings (OSTI)

The mass of the top quark (m{sub top}) is a fundamental parameter of the standard model (SM). Currently, its most precise measurements are performed by the CDF and D0 collaborations at the Fermilab Tevatron p{bar p} collider at a centre-of-mass energy of {radical}s = 1.96 TeV. We review the most recent of those measurements, performed on data samples of up to 8.7 fb{sup -1} of integrated luminosity. The Tevatron combination using up to 5.8 fb{sup -1} of data results in a preliminary world average top quark mass of m{sub top} = 173.2 {+-} 0.9 GeV. This corresponds to a relative precision of about 0.54%. We conclude with an outlook of anticipated precision the final measurement of m{sub top} at the Tevatron.

Brandt, Oleg; /Gottingen U., II. Phys. Inst.

2012-04-01T23:59:59.000Z

343

Exploration of hyperfine interaction between constituent quarks via eta productions  

E-Print Network (OSTI)

In this work, the different exchange freedom, one gluon, one pion or Goldstone boson, in constituent quark model is investigated, which is responsible to the hyperfine interaction between constituent quarks, via the combined analysis of the eta production processes, $\\pi^{-}p\\rightarrow\\eta n$ and $\\gamma p\\rightarrow\\eta p$. With the Goldstone-boson exchange, as well as the one-gluon or one-pion exchange, both the spectrum and observables, such as, the differential cross section and polarized beam asymmetry, are fitted to the suggested values of Particle Data Group and the experimental data. The first two types of exchange freedoms give acceptable description of the spectrum and observables while the one pion exchange can not describe the observables and spectrum simultaneously, so can be excluded. The experimental data for the two processes considered here strongly support the mixing angles for two lowest S11 sates and D13 states as about -30 and 6 degree respectively.

Jun He; S. G. Yuan; H. S. Xu

2011-05-09T23:59:59.000Z

344

Angular correlations in top quark decays in standard model extensions  

SciTech Connect

The CMS Collaboration at the CERN LHC has searched for the t-channel single top quark production using the spin correlation of the t-channel. The signal extraction and cross section measurement rely on the angular distribution of the charged lepton in the top quark decays, the angle between the charged lepton momentum and top spin in the top rest frame. The behavior of the angular distribution is a distinct slope for the t-channel single top (signal) while it is flat for the backgrounds. In this Brief Report, we investigate the contributions which this spin correlation may receive from a two-Higgs doublet model, a top-color assisted technicolor (TC2) and the noncommutative extension of the standard model.

Batebi, S. [Science and Research Branch, Islamic Azad University (IAU), Tehran (Iran, Islamic Republic of); Etesami, S. M. [School of Particles and Accelerators, Institute for Research in Fundamental Sciences (IPM), P.O. Box 19395-5531, Tehran (Iran, Islamic Republic of); Physics Department, Isfahan University of Technology (IUT), P.O. Box 11365-9161, Isfahan (Iran, Islamic Republic of); Mohammadi-Najafabadi, M. [Physics Department, Isfahan University of Technology (IUT), P.O. Box 11365-9161, Isfahan (Iran, Islamic Republic of)

2011-03-01T23:59:59.000Z

345

Determining Top Quark Couplings at the LHC: Snowmass White Paper  

E-Print Network (OSTI)

Top quarks are a prime system for hunting for new physics. Nonetheless, two decades on from their discovery few of their couplings have been measured to high precision. We present an overview of current determinations and the expected sensitivities with 300 fb-1 and 3000 fb-1 of 14 TeV LHC data. In addition to direct limits on the top quark's renormalizable couplings to Standard Model bosons, we also explore what bounds can be set on the coefficients of higher-dimension operators, taking particular four-fermion operators that do not interfere with QCD as a test case. Every coupling we consider will benefit greatly from a dedicated study at the future LHC. Some measurements, like the irrelevant operators, are systematics-limited and will saturate in the near-term. Others, like the important ttbar+Higgs coupling, involve rare processes and thus demand as much data as possible.

Jahred Adelman; Matthew Baumgart; Aran Garcia-Bellido; Andrey Loginov

2013-08-24T23:59:59.000Z

346

Color symmetrical superconductivity in a schematic nuclear quark model  

E-Print Network (OSTI)

In this note, a novel BCS-type formalism is constructed in the framework of a schematic QCD inspired quark model, having in mind the description of color symmetrical superconducting states. The physical properties of the BCS vacuum (average numbers of quarks of different colors) remain unchanged under an arbitrary color rotation. In the usual approach to color superconductivity, the pairing correlations affect only the quasi-particle states of two colors, the single particle states of the third color remaining unaffected by the pairing correlations. In the theory of color symmetrical superconductivity here proposed, the pairing correlations affect symmetrically the quasi-particle states of the three colors and vanishing net color-charge is automatically insured. It is found that the groundstate energy of the color symmetrical sector of the Bonn model is well approximated by the average energy of the color symmetrical superconducting state proposed here.

Henrik Bohr; Joo da Providncia

2009-09-14T23:59:59.000Z

347

Forward-backward asymmetry in top quark-antiquark production  

SciTech Connect

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 data set corresponding to an integrated luminosity of 5.4 fb{sup -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, V.M.; Abbott, B.; Acharya, B. S.; Adams, M.; Adams, T.; Alexeev, G. D.; Alkhazov, G.; Alton, A.; Alverson, G.; Alves, G. A.; Aoki, M.; Arov, M.; Askew, A.; Asman, B.; Atramentov, O.; Avila, C.; BackusMayes, J.; Badaud, F.; Bagby, L.; Baldin, B.; Bandurin, D. V.; Banerjee, S.; Barberis, E.; Baringer, P.; Barreto, J.; Bartlett, J. F.; Bassler, U.; Bazterra, V.; Beale, S.; Bean, A.; Begalli, M.; Begel, M.; Belanger-Champagne, C.; Bellantoni, L.; Beri, S. B.; Bernardi, G.; Bernhard, R.; Bertram, I.; Besancon, M.; Beuselinck, R.; Bezzubov, V. A.; Bhat, P. C.; Bhatnagar, V.; Blazey, G.; Blessing, S.; Bloom, K.; Boehnlein, A.; Boline, D.; Boos, E. E.; Borissov, G.; Bose, T.; Brandt, A.; Brandt, O.; Brock, R.; Brooijmans, G.; Bross, A.; Brown, D.; Brown, J.; Bu, X. B.; Buehler, M.; Buescher, V.; Bunichev, V.; Burdin, S.; Burnett, T. H.; Buszello, C. P.; Calpas, B.; Camacho-Perez, E.; Carrasco-Lizarraga, M. A.; Casey, B. C. K.; Castilla-Valdez, H.; Chakrabarti, S.; Chakraborty, D.; Chan, K. M.; Chandra, A.; Chen, G.; Chevalier-Thery, S.; Cho, D. K.; Cho, S. W.; Choi, S.; Choudhary, B.; Cihangir, S.; Claes, D.; Clutter, J.; Cooke, M.; Cooper, W. E.; Corcoran, M.; Couderc, F.; Cousinou, M. -C.; Croc, A.; Cutts, D.; Das, A.; Davies, G.; De, K.; de Jong, S. J.; De La Cruz-Burelo, E.; Deliot, F.; Demarteau, M.; Demina, R.; Denisov, D.; Denisov, S. P.; Desai, S.; Deterre, C.; DeVaughan, K.; Diehl, H. T.; Diesburg, M.; Ding, P. F.; Dominguez, A.; Dorland, T.; Dubey, A.; Dudko, L. V.; Duggan, D.; Duperrin, A.; Dutt, S.; Dyshkant, A.; Eads, M.; Edmunds, D.; Ellison, J.; Elvira, V. D.; Enari, Y.; Evans, H.; Evdokimov, A.; Evdokimov, V. N.; Facini, G.; Ferbel, T.; Fiedler, F.; Filthaut, F.; Fisher, W.; Fisk, H. E.; Fortner, M.; Fox, H.; Fuess, S.; Garcia-Bellido, A.; Gavrilov, V.; Gay, P.; Geng, W.; Gerbaudo, D.; Gerber, C. E.; Gershtein, Y.; Ginther, G.; Golovanov, G.; Goussiou, A.; Grannis, P. D.; Greder, S.; Greenlee, H.; Greenwood, Z. D.; Gregores, E. M.; Grenier, G.; Gris, Ph; Grivaz, J. -F.; Grohsjean, A.; Gruenendahl, S.; Gruenewald, M. W.; Guillemin, T.; Guo, F.; Gutierrez, G.; Gutierrez, P.; Haas, A.; Hagopian, S.; Haley, J.; Han, L.; Harder, K.; Harel, A.; Hauptman, J. M.; Hays, J.; Head, T.; Hebbeker, T.; Hedin, D.; Hegab, H.; Heinson, A. P.; Heintz, U.; Hensel, C.; Heredia-De La Cruz, I.; Herner, K.; Hesketh, G.; Hildreth, M. D.; Hirosky, R.; Hoang, T.; Hobbs, J. D.; Hoeneisen, B.; Hohlfeld, M.; Hubacek, Z.; Huske, N.; Hynek, V.; Iashvili, I.; Ilchenko, Y.; Illingworth, R.; Ito, A. S.; Jabeen, S.; Jaffre, M.; Jamin, D.; Jayasinghe, A.; Jesik, R.; Johns, K.; Johnson, M.; Johnston, D.; Jonckheere, A.; Jonsson, P.; Joshi, J.; Jung, A. W.; Juste, A.; Kaadze, K.; Kajfasz, E.; Karmanov, D.; Kasper, P. A.; Katsanos, I.; Kehoe, R.; Kermiche, S.; Khalatyan, N.; Khanov, A.; Kharchilava, A.; Kharzheev, Y. N.; Kirby, M. H.; Kohli, J. M.; Kozelov, A. V.; Kraus, J.; Kulikov, S.; Kumar, A.; Kupco, A.; Kurca, T.; Kuzmin, V. A.; Kvita, J.; Lammers, S.; Landsberg, G.; Lebrun, P.; Lee, H. S.; Lee, S. W.; Lee, W. M.; Lellouch, J.; Li, L.; Li, Q. Z.; Lietti, S. M.; Lim, J. K.; Lincoln, D.; Linnemann, J.; Lipaev, V. V.; Lipton, R.; Liu, Y.; Liu, Z.; Lobodenko, A.; Lokajicek, M.; de Sa, R. Lopes; Lubatti, H. J.; Luna-Garcia, R.; Lyon, A. L.; Maciel, A. K. A.; Mackin, D.; Madar, R.; Magana-Villalba, R.; Malik, S.; Malyshev, V. L.; Maravin, Y.; Martinez-Ortega, J.; McCarthy, R.; McGivern, C. L.; Meijer, M. M.; Melnitchouk, A.; Menezes, D.; Mercadante, P. G.; Merkin, M.; Meyer, A.; Meyer, J.; Miconi, F.; Mondal, N. K.; Muanza, G. S.; Mulhearn, M.; Nagy, E.; Naimuddin, M.; Narain, M.; Nayyar, R.; Neal, H. A.; Negret, J. P.; Neustroev, P.; Novaes, S. F.; Nunnemann, T.; Obrant, G.; Orbaker, D.; Orduna, J.; Osman, N.; Osta, J.; et. al.

2011-12-12T23:59:59.000Z

348

Classical strongly coupled quark-gluon plasma. VII. Energy loss  

Science Conference Proceedings (OSTI)

We use linear response analysis and the fluctuation-dissipation theorem to derive the energy loss of a heavy quark in the SU(2) classical Coulomb plasma in terms of the l=1 monopole and nonstatic structure factor. The result is valid for all Coulomb couplings {Gamma}=V/K, the ratio of the mean potential to kinetic energy. We use the Liouville equation in the collisionless limit to assess the SU(2) nonstatic structure factor. We find the energy loss to be strongly dependent on {Gamma}. In the liquid phase with {Gamma}{approx_equal}4, the energy loss is mostly metallic and soundless with neither a Cerenkov nor a Mach cone. Our analytical results compare favorably with the SU(2) molecular dynamics simulations at large momentum and for heavy quark masses.

Cho, Sungtae; Zahed, Ismail [Department of Physics and Astronomy, State University of New York, Stony Brook, New York 11794 (United States)

2010-12-15T23:59:59.000Z

349

Deutsche Rotor und Turm Service GmbH Co KG DRTS | Open Energy Information  

Open Energy Info (EERE)

Rotor und Turm Service GmbH Co KG DRTS Rotor und Turm Service GmbH Co KG DRTS Jump to: navigation, search Name Deutsche Rotor und Turm Service GmbH & Co KG (DRTS) Place Bremen, Germany Zip 28239 Sector Wind energy Product Service company for wind turbine blades and towers. References Deutsche Rotor und Turm Service GmbH & Co KG (DRTS)[1] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. Deutsche Rotor und Turm Service GmbH & Co KG (DRTS) is a company located in Bremen, Germany . References ↑ "Deutsche Rotor und Turm Service GmbH & Co KG (DRTS)" Retrieved from "http://en.openei.org/w/index.php?title=Deutsche_Rotor_und_Turm_Service_GmbH_Co_KG_DRTS&oldid=344202" Categories:

350

Higgs Boson Resummation via Bottom-Quark Fusion  

E-Print Network (OSTI)

The region of small transverse momentum in q-qbar- and gg-initiated processes must be studied in the framework of resummation to account for the large, logarithmically-enhanced contributions to physical observables. In this letter, we study resummed differential cross-sections for Higgs production via bottom-quark fusion. We find that the differential distribution peaks at approximately 15 GeV, a number of great experimental importance to measuring this production channel.

B. Field

2004-07-21T23:59:59.000Z

351

Single top quark production cross section at the Tevatron  

E-Print Network (OSTI)

The latest results on the measurements of electroweak top-quark production at the Tevatron are presented with the full RunII dataset. The CDF and D0 Collaborations have performed measurements of the s, t, and s+t channels in both l+jets and MET+jets final states. Evidence for the production of the s channel is presented for the first time.

Aran Garcia-Bellido; for the CDF; D0 Collaborations

2013-10-12T23:59:59.000Z

352

Quark flavor mixing, CP violation, and all that  

SciTech Connect

We review the present state of knowledge of the mixing of quark flavors under weak interactions and the associated explanation of CP violation inherent in the single nontrivial phase present in the three-generation mixing matrix. In this context we present the phenomenological basis for the increasing possibility that large CP violation asymmetries can be experimentally observed in the B meson system. 39 refs., 11 figs.,

Gilman, F.J.

1988-04-01T23:59:59.000Z

353

Scaling quark gluon plasma by HBT interferometry with lepton pairs  

E-Print Network (OSTI)

We study the intensity interferometry with lepton pairs for nuclear collisions at RHIC and LHC energies. It is argued that the invariant mass dependence of HBT radii extracted from the correlation functions of dilepton pairs can be used as an efficient tool to scale the size and life time of the quark gluon plasma expected to be formed in nuclear collisions at RHIC and LHC. Quantitatively different magnitudes of HBT radii are obtained at RHIC and LHC indicating stronger radial flow at LHC.

Payal Mohanty; Jan-e Alam

2012-02-10T23:59:59.000Z

354

Top quark pair production cross section at the Tevatron  

SciTech Connect

Top quark pair production cross section has been measured at the Tevatron by CDF and D0 collaborations using different channels and methods, in order to test standard model predictions, and to search for new physics hints affecting the t{bar t} production mechanism or decay. Measurements are carried out with an integrated luminosity of 1.0 to 2.0 fb{sup -1}, and are found to be consistent with standard model expectations.

Cortiana, Giorgio; /INFN, Padua /Padua U.

2008-04-01T23:59:59.000Z

355

Top Quark Production Cross Section at the Tevatron  

SciTech Connect

An overview of the preliminary results of the top quark pair production cross section measurements at a center-of-mass energy of 1.96 TeV carried out by the CDF and D0 collaborations is presented. The data samples used for the analyses are collected in the current Tevatron run and correspond to an integrated luminosity from 360 pb{sup -1} up to 760 pb{sup -1}.

Shabalina, E.; /Chicago U.

2006-05-01T23:59:59.000Z

356

Top Quark Anomalous Couplings at the International Linear Collider  

SciTech Connect

We present a study of the experimental determination of the forward-backward asymmetry in the process e{sup +}e{sup -} {yields} t{bar t} and in the subsequent t {yields} Wb decay, studied in the context of the International Linear Collider. This process probes the elementary couplings of the top quark to the photon, the Z and the W bosons at a level of precision that is difficult to achieve at hadron colliders. Measurement of the forward-backward asymmetry requires excellent b quark identification and determination of the quark charge. The study reported here is performed in the most challenging all-hadronic channel e{sup +}e{sup -} {yields} b{bar b}q{bar q}q{bar q}. It includes realistic details of the experimental environment, a full Monte Carlo simulation of the detector, based on the Silicon Detector concept, and realistic event reconstruction. The forward-backward asymmetries are determined to a precision of approximately 1% for each of two choices of beam polarization. We analyze the implications for the determination of the t{bar t}Z and Wt{bar b} couplings.

Devetak, Erik; Nomerotski, Andrei; /Oxford U.; Peskin, Michael; /SLAC

2011-08-15T23:59:59.000Z

357

The Higgs Boson Might Not Couple To B Quarks.  

E-Print Network (OSTI)

We discuss an alternative version of the electroweak standard model, in which only the heavy t quark, not the light fermions, couples to the Higgs boson with a strength given by the standard model. The Higgs particle decays dominantly into two gluons jets. The branching ratio for the 2? decay is about 3.5%. The Higgs particle would be a narrow object (width about 60 KeV), and its mass might be consistent with the value given by typical estimates of radiative effects measured by the LEP experiments. to appear in Physics Letters B.As far as the mass generation within the framework of the standard electroweak model is concerned, one must differentiate between the mass generation for the electroweak bosons W, Z, the mass generation for the heavy t quark, and the generation of mass for the leptons and the five remaining, relatively light quarks. While there exists no freedom in the choice of the interaction strengths of the weak bosons with the scalar field, which is dictated

Xavier Calmet; Harald Fritzsch

2008-01-01T23:59:59.000Z

358

Numerical simulation of the hydrodynamical combustion to strange quark matter  

Science Conference Proceedings (OSTI)

We present results from a numerical solution to the burning of neutron matter inside a cold neutron star into stable u,d,s quark matter. Our method solves hydrodynamical flow equations in one dimension with neutrino emission from weak equilibrating reactions, and strange quark diffusion across the burning front. We also include entropy change from heat released in forming the stable quark phase. Our numerical results suggest burning front laminar speeds of 0.002-0.04 times the speed of light, much faster than previous estimates derived using only a reactive-diffusive description. Analytic solutions to hydrodynamical jump conditions with a temperature-dependent equation of state agree very well with our numerical findings for fluid velocities. The most important effect of neutrino cooling is that the conversion front stalls at lower density (below {approx_equal}2 times saturation density). In a two-dimensional setting, such rapid speeds and neutrino cooling may allow for a flame wrinkle instability to develop, possibly leading to detonation.

Niebergal, Brian; Ouyed, Rachid [Department of Physics and Astronomy, University of Calgary, 2500 University Drive NW, Calgary, Alberta, T2N 1N4 (Canada); Jaikumar, Prashanth [Department of Physics and Astronomy, California State University Long Beach, 1250 Bellflower Blvd., Long Beach, California 90840 (United States); Institute of Mathematical Sciences, C.I.T. Campus, Chennai, TN 600113 (India)

2010-12-15T23:59:59.000Z

359

The Fluid Nature of Quark-Gluon Plasma  

E-Print Network (OSTI)

Collisions of heavy nuclei at very high energies offer the exciting possibility of experimentally exploring the phase transformation from hadronic to partonic degrees of freedom which is predicted to occur at several times normal nuclear density and/or for temperatures in excess of $\\sim 170$ MeV. Such a state, often referred to as a quark-gluon plasma, is thought to have been the dominant form of matter in the universe in the first few microseconds after the Big Bang. Data from the first five years of heavy ion collisions of Brookhaven National Laboratory's Relativistic Heavy Ion Collider (RHIC) clearly demonstrate that these very high temperatures and densities have been achieved. While there are strong suggestions of the role of quark degrees of freedom in determining the final-state distributions of the produced matter, there is also compelling evidence that the matter does {\\em not} behave as a quasi-ideal state of free quarks and gluons. Rather, its behavior is that of a dense fluid with very low kinematic viscosity exhibiting strong hydrodynamic flow and nearly complete absorption of high momentum probes. The current status of the RHIC experimental studies is presented, with a special emphasis on the fluid properties of the created matter, which may in fact be the most perfect fluid ever studied in the laboratory.

W. A. Zajc

2008-02-25T23:59:59.000Z

360

Cooking Up Hot Quark Soup | U.S. DOE Office of Science (SC)  

NLE Websites -- All DOE Office Websites (Extended Search)

Cooking Up Hot Quark Soup Cooking Up Hot Quark Soup Stories of Discovery & Innovation Cooking Up Hot Quark Soup Enlarge Photo Image courtesy of Brookhaven National Laboratory These images contrast the degree of interaction and collective motion, or "flow," among quarks in the predicted gaseous quark-gluon plasma state (Figure on left, see mpeg animation ) vs. the liquid state that has been observed in gold-gold collisions at RHIC (Figure on right, see mpeg animation ). The green "force lines" and collective motion (visible on the animated version only) show the much higher degree of interaction and flow among the quarks in what is now being described as a nearly "perfect" liquid. Enlarge Photo Photo courtesy of Brookhaven National Laboratory Brookhaven National Laboratory's Relativistic

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361

Flavor Asymmetry of the Nucleon Sea and the Five-Quark Components of the Nucleons  

Science Conference Proceedings (OSTI)

The existence of the five-quark Fock states for the intrinsic charm quark in the nucleons was suggested some time ago, but conclusive evidence is still lacking. We generalize the previous theoretical approach to the light-quark sector and study possible experimental signatures for such five-quark states. In particular, we compare the d-u and u+d-s-s data with the calculations based on the five-quark Fock states. The qualitative agreement between the data and the calculations is interpreted as evidence for the existence of the intrinsic light-quark sea in the nucleons. The probabilities for the |uuduu> and |uuddd> Fock states are also extracted.

Chang, Wen-Chen [Institute of Physics, Academia Sinica, Taipei 11529, Taiwan (China); Peng, Jen-Chieh [Institute of Physics, Academia Sinica, Taipei 11529, Taiwan (China); Department of Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801 (United States)

2011-06-24T23:59:59.000Z

362

Ginzburg-Landau equations for superconducting quark matter in neutron stars  

E-Print Network (OSTI)

We investigate magnetic properties of color superconducting quark matter within a Ginzburg-Landau approach. The simultaneous coupling of the quark fields to gluonic and electromagnetic gauge fields leads to rotated electromagnetism with a massive (Higgsed) and a massless photon-gluon field. We derive the Ginzburg-Landau equations for superconducting quark matter taking into account the rotated electromagnetism in the general case when the rotation angle is an arbitrary function of the coordinates. We solve these equations for an isolated vortex in superconducting quark matter. We obtain a solution for the magnetic and gluomagnetic fields and expressions for the calculation of the penetration depth and the quantized magnetic flux in quark matter. For this case we have demonstrated that the occurence of electric and color Meissner currents is a consequence of the color superconducting state of quark matter.

D. Blaschke; D. Sedrakian

2000-06-19T23:59:59.000Z

363

Energy loss and thermalization of heavy quarks in a strongly-coupled plasma  

E-Print Network (OSTI)

Using the AdS/CFT correspondence, we compute the medium-induced energy loss of a decelerating heavy quark moving through a strongly-coupled supersymmetric Yang Mills plasma. In the regime where the deceleration is small, a perturbative calculation is possible and we obtain the first two corrections to the energy-loss rate of a heavy quark with constant velocity. The thermalization of the heavy quark is also discussed.

Marquet, C; Xiao, B -W

2009-01-01T23:59:59.000Z

364

Search of anomalous $Wtb$ couplins in single top quark prodution at D0  

SciTech Connect

The large mass of the top quark, close to the electroweak symmetry-breaking scale, makes it a good candidate for probing physics beyond the Standard Model, including possible anomalous couplings. D0 has made measurements of single top quark production using 5.4 fb{sup -1} of integrated luminosity. We examine the data to study the Lorentz structure of the Wtb coupling. We find that the data prefer the left-handed vector coupling and set upper limits on the anomalous couplings. In 2009, the electroweak single top quark production was observed by the D0 and CDF collaborations. Electroweak production of top quarks at the Tevatron proceeds mainly via the decay of a time-like virtual W boson accompanied by a bottom quark in the s-channel (tb = t{bar b} + {bar t}b), or via the exchange of a space-like virtual W boson between a light quark and a bottom quark in the t-channel (tqb = tq{bar b} + {bar t}qb, where q refers to the light quark). For a top quark mass of 172.5 GeV, The Standard Model (SM) prediction of single top production rate at next-to-leading order with soft-gluon contributions at next-to-next-to-leading order are 1.04 {+-} 0.04 pb (s-channel) and 2.26 {+-} 0.12 pb (t-channel). The large mass of the top quark implies that it has large couplings to the electroweak symmetry breaking sector of the SM and may have non-standard interactions with the weak gauge bosons. Single top quark production provides a unique probe to study the interactions of the top quark with the W boson.

Joshi, Jyoti; Beri, Suman; /Panjab U.

2011-12-01T23:59:59.000Z

365

Quark-mass dependence of three-flavor QCD at zero and imaginary chemical potential  

E-Print Network (OSTI)

We draw the three-flavor phase diagram as a function of light and strange quark masses for both zero and imaginary quark-number chemical potential, using the Polyakov-loop extended Nambu--Jona-Lasinio model with an effective four-quark vertex depending on the Polyakov loop. The model prediction is consistent with 2+1 flavor lattice QCD prediction at zero chemical potential and with degenerate three-flavor lattice QCD prediction at imaginary chemical potential.

Sasaki, Takahiro; Kouno, Hiroaki; Yahiro, Masanobu

2011-01-01T23:59:59.000Z

366

Search for pair production of the scalar top quark in the electron-muon final state  

E-Print Network (OSTI)

We report the result of a search for the pair production of the lightest supersymmetric partner of the top quark ($\\tilde{t}_1$) in $p\\bar{p}$ collisions at a center-of-mass energy of 1.96 TeV at the Fermilab Tevatron collider corresponding to an integrated luminosity of 5.4 fb$^{-1}$. The scalar top quarks are assumed to decay into a $b$ quark, a charged lepton, and a scalar neutrino ($\\tilde{\

V. M. Abazov; B. Abbott; M. Abolins; B. S. Acharya; M. Adams; T. Adams; G. D. Alexeev; G. Alkhazov; A. Altona; G. Alverson; G. A. Alves; L. S. Ancu; M. Aoki; Y. Arnoud; M. Arov; A. Askew; B. sman; O. Atramentov; C. Avila; J. BackusMayes; F. Badaud; L. Bagby; B. Baldin; D. V. Bandurin; S. Banerjee; E. Barberis; P. Baringer; J. Barreto; J. F. Bartlett; U. Bassler; V. Bazterra; S. Beale; A. Bean; M. Begalli; M. Begel; C. Belanger-Champagne; L. Bellantoni; S. B. Beri; G. Bernardi; R. Bernhard; I. Bertram; M. Besanon; R. Beuselinck; V. A. Bezzubov; P. C. Bhat; V. Bhatnagar; G. Blazey; S. Blessing; K. Bloom; A. Boehnlein; D. Boline; T. A. Bolton; E. E. Boos; G. Borissov; T. Bose; A. Brandt; O. Brandt; R. Brock; G. Brooijmans; A. Bross; D. Brown; J. Brown; X. B. Bu; D. Buchholz; M. Buehler; V. Buescher; V. Bunichev; S. Burdinb; T. H. Burnett; C. P. Buszello; B. Calpas; E. Camacho-Prez; M. A. Carrasco-Lizarraga; B. C. K. Casey; H. Castilla-Valdez; S. Chakrabarti; D. Chakraborty; K. M. Chan; A. Chandra; G. Chen; S. Chevalier-Thry; D. K. Cho; S. W. Cho; S. Choi; B. Choudhary; T. Christoudias; S. Cihangir; D. Claes; J. Clutter; M. Cooke; W. E. Cooper; M. Corcoran; F. Couderc; M. -C. Cousinou; A. Croc; D. Cutts; M. ?wiok; A. Das; G. Davies; K. De; S. J. de Jong; E. De La Cruz-Burelo; F. Dliot; M. Demarteau; 47 R. Demina; D. Denisov; S. P. Denisov; S. Desai; K. DeVaughan; H. T. Diehl; M. Diesburg; A. Dominguez; T. Dorland; A. Dubey; L. V. Dudko; D. Duggan; A. Duperrin; S. Dutt; A. Dyshkant; M. Eads; D. Edmunds; J. Ellison; V. D. Elvira; Y. Enari; S. Eno; H. Evans; A. Evdokimov; V. N. Evdokimov; G. Facini; T. Ferbel; F. Fiedler; F. Filthaut; W. Fisher; H. E. Fisk; M. Fortner; H. Fox; S. Fuess; T. Gadfort; A. Garcia-Bellido; V. Gavrilov; P. Gay; W. Geist; W. Geng; D. Gerbaudo; C. E. Gerber; Y. Gershtein; G. Ginther; G. Golovanov; A. Goussiou; P. D. Grannis; S. Greder; H. Greenlee; Z. D. Greenwood; E. M. Gregores; G. Grenier; Ph. Gris; J. -F. Grivaz; A. Grohsjean; S. Grnendahl; M. W. Grnewald; F. Guo; J. Guo; G. Gutierrez; P. Gutierrez; A. Haasc; S. Hagopian; J. Haley; L. Han; K. Harder; A. Harel; J. M. Hauptman; J. Hays; T. Head; T. Hebbeker; D. Hedin; H. Hegab; A. P. Heinson; U. Heintz; C. Hensel; I. Heredia-De La Cruz; K. Herner; G. Hesketh; M. D. Hildreth; R. Hirosky; T. Hoang; J. D. Hobbs; B. Hoeneisen; M. Hohlfeld; S. Hossain; Z. Hubacek; N. Huske; V. Hynek; I. Iashvili; R. Illingworth; A. S. Ito; S. Jabeen; M. Jaffr; S. Jain; D. Jamin; R. Jesik; K. Johns; M. Johnson; D. Johnston; A. Jonckheere; P. Jonsson; J. Joshi; A. Justed; K. Kaadze; E. Kajfasz; D. Karmanov; P. A. Kasper; I. Katsanos; R. Kehoe; S. Kermiche; N. Khalatyan; A. Khanov; A. Kharchilava; Y. N. Kharzheev; D. Khatidze; M. H. Kirby; J. M. Kohli; A. V. Kozelov; J. Kraus; A. Kumar; A. Kupco; T. Kur?a; V. A. Kuzmin; J. Kvita; S. Lammers; G. Landsberg; P. Lebrun; H. S. Lee; S. W. Lee; W. M. Lee; J. Lellouch; L. Li; Q. Z. Li; S. M. Lietti; J. K. Lim; D. Lincoln; J. Linnemann; V. V. Lipaev; R. Lipton; Y. Liu; Z. Liu; A. Lobodenko; M. Lokajicek; P. Love; H. J. Lubatti; R. Luna-Garciae; A. L. Lyon; A. K. A. Maciel; D. Mackin; R. Madar; R. Magaa-Villalba; S. Malik; V. L. Malyshev; Y. Maravin; J. Martnez-Ortega; R. McCarthy; C. L. McGivern; M. M. Meijer; A. Melnitchouk; D. Menezes; P. G. Mercadante; M. Merkin; A. Meyer; J. Meyer; N. K. Mondal; G. S. Muanza; M. Mulhearn; E. Nagy; M. Naimuddin; M. Narain; R. Nayyar; H. A. Neal; J. P. Negret; P. Neustroev; S. F. Novaes; T. Nunnemann; G. Obrant; J. Orduna; N. Osman; J. Osta; G. J. Otero y Garzn; M. Owen; M. Padilla; M. Pangilinan; N. Parashar; V. Parihar; S. K. Park; J. Parsons; R. Partridgec; N. Parua; A. Patwa; B. Penning; M. Perfilov; K. Peters; Y. Peters; G. Petrillo; P. Ptroff; R. Piegaia; J. Piper; M. -A. Pleier; P. L. M. Podesta-Lermaf; V. M. Podstavkov; M. -E. Pol; P. Polozov; A. V. Popov; M. Prewitt; D. Price; S. Protopopescu; J. Qian; A. Quadt; B. Quinn; M. S. Rangel; K. Ranjan; P. N. Ratoff; I. Razumov; P. Renkel; P. Rich; M. Rijssenbeek; I. Ripp-Baudot; F. Rizatdinova; M. Rominsky; C. Royon; P. Rubinov; R. Ruchti; G. Safronov; G. Sajot; A. Snchez-Hernndez; M. P. Sanders; B. Sanghi; A. S. Santos; G. Savage; L. Sawyer; T. Scanlon; R. D. Schamberger; Y. Scheglov; H. Schellman; T. Schliephake; S. Schlobohm; C. Schwanenberger; R. Schwienhorst; J. Sekaric; H. Severini; E. Shabalina; V. Shary; A. A. Shchukin; R. K. Shivpuri; V. Simak; V. Sirotenko; P. Skubic; P. Slattery; D. Smirnov; K. J. Smith; G. R. Snow; J. Snow; S. Snyder; S. Sldner-Rembold; L. Sonnenschein; A. Sopczak; M. Sosebee; K. Soustruznik; B. Spurlock; J. Stark; V. Stolin; D. A. Stoyanova; E. Strauss; M. Strauss; D. Strom; L. Stutte; P. Svoisky; M. Takahashi; A. Tanasijczuk; W. Taylor; M. Titov; V. V. Tokmenin; D. Tsybychev; B. Tuchming; C. Tully; P. M. Tuts; L. Uvarov

2010-09-29T23:59:59.000Z

367

Sensitivity to the Single Production of Vector-Like Quarks at an Upgraded Large Hadron Collider  

E-Print Network (OSTI)

In this note we consider the sensitivity of the Large Hadron Collider (LHC) to the single production of new heavy vector-like quarks. We consider a model with large mixing with the standard model top quark with electroweak production of single heavy top quarks. We consider center of mass energies of 14, 33, and 100 TeV with various pileup scenarios and present the expected sensitivity and exclusion limits.

Tim Andeen; Clare Bernard; Kevin Black; Taylor Childres; Lidia Dell'Asta; Natascia Vignaroli

2013-09-07T23:59:59.000Z

368

Systematic Study of Charm Quark Energy Loss Using Parton Cascade Model  

E-Print Network (OSTI)

In this paper we use a Parton Cascade Model to study the evolution of charm quarks propagating through a thermal brick of QCD matter. We determine the energy loss and the transport coefficient 'qhat' for charm quarks. The calculations are done for constant temperature of 350 MeV and the results are compared to analytical calculations of heavy quark energy loss in order to validate the applicability of using a Parton Cascade Model for the study of heavy quark dynamics in hot and dense QCD matter.

Mohammed Younus; Christopher E. Coleman-Smith; Steffen A. Bass; Dinesh K. Srivastava

2013-09-05T23:59:59.000Z

369

The Particle Adventure | How do we interpret our data? | A quark...  

NLE Websites -- All DOE Office Websites (Extended Search)

A quarkgluon event In these pictures e- and e+ beams, perpendicular to the screen, met and annihilated. The resulting quarks and antiquarks combined to produce mesons and baryons,...

370

Chiral transition and deconfinement transition in QCD with the highly improved staggered quark (HISQ) action  

Science Conference Proceedings (OSTI)

We report preliminary results on the chiral and deconfinement aspects of the QCD transition at finite temperature using the Highly Improved Staggered Quark (HISQ) action on lattices with temporal extent of N{sub {tau}} = 6 and 8. The chiral aspects of the transition are studied in terms of quark condensates and the disconnected chiral susceptibility. We study the deconfinement transition in terms of the strange quark number susceptibility and the renormalized Polyakov loop. We made continuum estimates for some quantities and find reasonably good agreement between our results and the recent continuum extrapolated results obtained with the stout staggered quark action.

Petreczky P.; Bazavov, A.

2011-10-11T23:59:59.000Z

371

Improving the Top Quark Forward-Backward Asymmetry Measurement at the LHC  

Science Conference Proceedings (OSTI)

At the LHC, top quark pairs are dominantly produced from gluons, making it difficult to measure the top quark forward-backward asymmetry. To improve the asymmetry measurement, we study variables that can distinguish between top quarks produced from quarks and those from gluons: the invariant mass of the top pair, the rapidity of the top-antitop system in the lab frame, the rapidity of the top quark in the top-antitop rest frame, the top quark polarization and the top-antitop spin correlation. We combine all the variables in a likelihood discriminant method to separate quark-initiated events from gluon-initiated events. We apply our method on models including G-prime's and W-prime's motivated by the recent observation of a large top quark forward-backward asymmetry at the Tevatron. We have found that the significance of the asymmetry measurement can be improved by 10% to 30%. At the same time, the central values of the asymmetry increase by 40% to 100%. We have also analytically derived the best spin quantization axes for studying top quark polarization as well as spin-correlation for the new physics models.

Bai, Yang; /SLAC; Han, Zhenyu; /Harvard U., Phys. Dept.

2011-08-15T23:59:59.000Z

372

Search for pair production of the scalar top quark in muon+tau final states  

E-Print Network (OSTI)

We present a search for the pair production of scalar top quarks ($\\tilde{t}_{1}$), the lightest supersymmetric partners of the top quarks, in $p\\bar{p}$ collisions at a center-of-mass energy of 1.96 TeV, using data corresponding to an integrated luminosity of {7.3 $fb^{-1}$} collected with the \\dzero experiment at the Fermilab Tevatron Collider. Each scalar top quark is assumed to decay into a $b$ quark, a charged lepton, and a scalar neutrino ($\\tilde{\

D0 Collaboration; V. M. Abazov; B. Abbott; B. S. Acharya; M. Adams; T. Adams; G. D. Alexeev; G. Alkhazov; A. Alton; G. Alverson; M. Aoki; A. Askew; B. Asman; S. Atkins; O. Atramentov; K. Augsten; C. Avila; J. BackusMayes; F. Badaud; L. Bagby; B. Baldin; D. V. Bandurin; S. Banerjee; E. Barberis; P. Baringer; J. Barreto; J. F. Bartlett; U. Bassler; V. Bazterra; A. Bean; M. Begalli; C. Belanger-Champagne; L. Bellantoni; S. B. Beri; G. Bernardi; R. Bernhard; I. Bertram; M. Besancon; R. Beuselinck; V. A. Bezzubov; P. C. Bhat; S. Bhatia; V. Bhatnagar; G. Blazey; S. Blessing; K. Bloom; A. Boehnlein; D. Boline; E. E. Boos; G. Borissov; T. Bose; A. Brandt; O. Brandt; R. Brock; G. Brooijmans; A. Bross; D. Brown; J. Brown; X. B. Bu; M. Buehler; V. Buescher; V. Bunichev; S. Burdin; T. H. Burnett; C. P. Buszello; B. Calpas; E. Camacho-Perez; M. A. Carrasco-Lizarraga; B. C. K. Casey; H. Castilla-Valdez; S. Chakrabarti; D. Chakraborty; K. M. Chan; A. Chandra; E. Chapon; G. Chen; S. Chevalier-Thery; D. K. Cho; S. W. Cho; S. Choi; B. Choudhary; S. Cihangir; D. Claes; J. Clutter; M. Cooke; W. E. Cooper; M. Corcoran; F. Couderc; M. -C. Cousinou; A. Croc; D. Cutts; A. Das; G. Davies; S. J. de Jong; E. De La Cruz-Burelo; F. Deliot; R. Demina; D. Denisov; S. P. Denisov; S. Desai; C. Deterre; K. DeVaughan; H. T. Diehl; M. Diesburg; P. F. Ding; A. Dominguez; T. Dorland; A. Dubey; L. V. Dudko; D. Duggan; A. Duperrin; S. Dutt; A. Dyshkant; M. Eads; D. Edmunds; J. Ellison; V. D. Elvira; Y. Enari; H. Evans; A. Evdokimov; V. N. Evdokimov; G. Facini; T. Ferbel; F. Fiedler; F. Filthaut; W. Fisher; H. E. Fisk; M. Fortner; H. Fox; S. Fuess; A. Garcia-Bellido; G. A. Garcia-Guerra; V. Gavrilov; P. Gay; W. Geng; D. Gerbaudo; C. E. Gerber; Y. Gershtein; G. Ginther; G. Golovanov; A. Goussiou; P. D. Grannis; S. Greder; H. Greenlee; Z. D. Greenwood; E. M. Gregores; G. Grenier; Ph. Gris; J. -F. Grivaz; A. Grohsjean; S. Grunendahl; M. W. Grunewald; T. Guillemin; G. Gutierrez; P. Gutierrez; A. Haas; S. Hagopian; J. Haley; L. Han; K. Harder; A. Harel; J. M. Hauptman; J. Hays; T. Head; T. Hebbeker; D. Hedin; H. Hegab; A. P. Heinson; U. Heintz; C. Hensel; I. Heredia-De La Cruz; K. Herner; G. Hesketh; M. D. Hildreth; R. Hirosky; T. Hoang; J. D. Hobbs; B. Hoeneisen; M. Hohlfeld; Z. Hubacek; V. Hynek; I. Iashvili; Y. Ilchenko; R. Illingworth; A. S. Ito; S. Jabeen; M. Jaffre; D. Jamin; A. Jayasinghe; R. Jesik; K. Johns; M. Johnson; A. Jonckheere; P. Jonsson; J. Joshi; A. W. Jung; A. Juste; K. Kaadze; E. Kajfasz; D. Karmanov; P. A. Kasper; I. Katsanos; R. Kehoe; S. Kermiche; N. Khalatyan; A. Khanov; A. Kharchilava; Y. N. Kharzheev; J. M. Kohli; A. V. Kozelov; J. Kraus; S. Kulikov; A. Kumar; A. Kupco; T. Kurca; V. A. Kuzmin; S. Lammers; G. Landsberg; P. Lebrun; H. S. Lee; S. W. Lee; W. M. Lee; J. Lellouch; H. Li; L. Li; Q. Z. Li; S. M. Lietti; J. K. Lim; D. Lincoln; J. Linnemann; V. V. Lipaev; R. Lipton; Y. Liu; A. Lobodenko; M. Lokajicek; R. Lopes de Sa; H. J. Lubatti; R. Luna-Garcia; A. L. Lyon; A. K. A. Maciel; D. Mackin; R. Madar; R. Magana-Villalba; S. Malik; V. L. Malyshev; Y. Maravin; J. Martinez-Ortega; R. McCarthy; C. L. McGivern; M. M. Meijer; A. Melnitchouk; D. Menezes; P. G. Mercadante; M. Merkin; A. Meyer; J. Meyer; F. Miconi; N. K. Mondal; G. S. Muanza; M. Mulhearn; E. Nagy; M. Naimuddin; M. Narain; R. Nayyar; H. A. Neal; J. P. Negret; P. Neustroev; S. F. Novaes; T. Nunnemann; G. Obrant; J. Orduna; N. Osman; J. Osta; G. J. Otero y Garzon; M. Padilla; A. Pal; N. Parashar; V. Parihar; S. K. Park; R. Partridge; N. Parua; A. Patwa; B. Penning; M. Perfilov; Y. Peters; K. Petridis; G. Petrillo; P. Petroff; R. Piegaia; M. -A. Pleier; P. L. M. Podesta-Lerma; V. M. Podstavkov; P. Polozov; A. V. Popov; M. Prewitt; D. Price; N. Prokopenko; J. Qian; A. Quadt; B. Quinn; M. S. Rangel; K. Ranjan; P. N. Ratoff; I. Razumov; P. Renkel; M. Rijssenbeek; I. Ripp-Baudot; F. Rizatdinova; M. Rominsky; A. Ross; C. Royon; P. Rubinov; R. Ruchti; G. Safronov; G. Sajot; P. Salcido; A. Sanchez-Hernandez; M. P. Sanders; B. Sanghi; A. S. Santos; G. Savage; L. Sawyer; T. Scanlon; R. D. Schamberger; Y. Scheglov; H. Schellman; T. Schliephake; S. Schlobohm; C. Schwanenberger; R. Schwienhorst; J. Sekaric; H. Severini; E. Shabalina; V. Shary; A. A. Shchukin; R. K. Shivpuri; V. Simak; V. Sirotenko; P. Skubic; P. Slattery; D. Smirnov; K. J. Smith; G. R. Snow; J. Snow; S. Snyder; S. Soldner-Rembold; L. Sonnenschein; K. Soustruznik; J. Stark; V. Stolin; D. A. Stoyanova; M. Strauss; D. Strom; L. Stutte; L. Suter; P. Svoisky; M. Takahashi; A. Tanasijczuk; M. Titov; V. V. Tokmenin; Y. -T. Tsai; K. Tschann-Grimm; D. Tsybychev; B. Tuchming; C. Tully; L. Uvarov; S. Uvarov; S. Uzunyan; R. Van Kooten; W. M. van Leeuwen; N. Varelas; E. W. Varnes; I. A. Vasilyev; P. Verdier; L. S. Vertogradov; M. Verzocchi; M. Vesterinen; D. Vilanova; P. Vokac

2012-02-09T23:59:59.000Z

373

Shock waves from heavy-quark mesons in AdS/CFT  

E-Print Network (OSTI)

We calculate the far-field stress-energy tensor of a quark gluon plasma due to a heavy-quark meson moving through it, using a semi-classical description in string theory of the meson as a string hanging into anti-de Sitter space. We find that these mesons create a shock wave but no diffusion wake, in contrast to single heavy quarks described via a trailing string, where the diffusion wake is strong. If thermal QCD responds similarly to heavy quarks and heavy quarkonia, the presence or suppression of the diffusion wake constitutes a prediction which can in principle be checked in heavy-ion collisions.

Steven S. Gubser; Silviu S. Pufu; Amos Yarom

2007-11-09T23:59:59.000Z

374

Bachelor Chemie und Molekulare Wissenschaften Stundenplan 1. Semester Herbstsemester 2012  

E-Print Network (OSTI)

Bachelor Chemie und Molekulare Wissenschaften Stundenplan 1. Semester ­ Herbstsemester 2012 Die Mittwoch Donnerstag Freitag 08.15-09.00 Mathematik I Prof. T. Wihler Chemie UG 113 4 ECTS Mathematik I Prof. T. Wihler Chemie UG 113 Praktikum Allg. Chemie Dr. R. Weber 09.15-10.00 Allgemeine Chemie I Prof. J

Mühlemann, Oliver

375

Professur fr Soziologie und Pdagogik (Stand Januar 2010)  

E-Print Network (OSTI)

Entwicklungen in Europa und Südosteuropa, in: Sterbling, Anton (Hrsg.): Zivilgesellschaftliche Entwicklungen, in: Balla, Bálint/Sterbling, Anton (Hrsg.): Globalisierung, Europäisierung, Regionalisierung ­ unter Sozialismus? Das multiethnische Banat als Fallbeispiel, in: Balla, Bálint/Sterbling, Anton (Hrsg

Seyfarth, Andre

376

MHH Forschungsbericht 2004 7 Abteilung Funktionelle und Angewandte Anatomie  

E-Print Network (OSTI)

. In: Michel MC, Hrsg. Neuropeptide Y and related peptides, Vol. 162 Handbook of Experimental Pharmaco, Bedoui S. Formation, storage, release and degradation of NPY, PYY and PP. In: Michel MC, Hrsg;23-44. Nave H, Pabst R. Anatomie und Physiolo- gie. In: Meyer HJ, Buhr HJ, Wilke H, Hrsg. Management des

Manstein, Dietmar J.

377

MHH Forschungsbericht 2004 343 Abteilung Strahlentherapie und Spezielle Onkologie  

E-Print Network (OSTI)

: Vulva und Urethra. In: M Bamberg, M Molls, H Sack (Hrsg.): Radioonkologie. Band 2: Klinik. W Molls, H Sack (Hrsg.): Radio- onkologie. Band 2: Klinik. W. Zuckschwerdt Verlag, München Wien New York Krukemeyer, W Wagner (Hrsg.): Strahlenmedizin ­ Ein Leitfaden für den Praktiker. Walter de Gruyter, Berlin

Manstein, Dietmar J.

378

ehrungen und preise Preistrgerinnen & Preistrger der TU Berlin  

E-Print Network (OSTI)

, stifter: deutsche post dhL n ERC Advanced Grant Prof. Dr. Volker Mehrmann, institut für Mathematik 2011 n Wissenschaftsmedaille Prof. Dr. Drs. h.c. Helmut Schwarz, institut für Chemie, präsident der Chemie und Biochemie der Tschechischen Akademie der Wissen- schaften n Gottfried Wilhelm Leibniz

Wichmann, Felix

379

Tumorinvasion und Metastasierung3 Biologie hmatologischer Neoplasien3  

E-Print Network (OSTI)

Prof. Dr. Dr. L.F. Tietze, Abteilung Organische Chemie, Universität Göttingen Prof. Dr. E. Grabbe. Tumorvirologie, Universität Hamburg Prof. C. Wagener, Dr. Andrea Horst, Institut für Klinische Chemie, UKE/11 Deutsche Krebshilfe, PTN und ALK vermittelte Invasivität von Tumorzellen in Interaktion mit Stromazellen

Gollisch, Tim

380

Ein fruchtbarer Dialog Gymnasien und HocHscHulen  

E-Print Network (OSTI)

-Mail: info@next-energy.de Internet: www.next-energy.de #12;13 Erneuerbare Energien Forschungsprofile aus Weser-Ems #12;Transfer Weser-Ems 14 #12;15 Erneuerbare Energien FuE-Bereich Energie OFFIS - Institut für, Erneuerbare Energien #12;37 Erneuerbare Energien Energie- und Halbleiterforschung Carl von Ossietzky

Note: This page contains sample records for the topic "quarks und leptonen" 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.
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to obtain the most current and comprehensive results.


381

Technische Universitt Berlin Fachgebiet Elektronische Mess-und Diagnosetechnik  

E-Print Network (OSTI)

und 245 S-Bahn: Bahnhof Zoologischer Garten, Linien S3, S5, S7, S75, S9 Bahnhof Tiergarten, Linien S3 durchqueren. Mit der Bahn · Bis zum Bahnhof Zoologischer Garten fahren, von dort entweder die U-Bahn Linie 2 (Richtung Westkreuz) umsteigen. Zoologischer Garten wieder aussteigen. Von dort entweder die U- Bahn Linie 2

Wichmann, Felix

382

Quark-antiquark composite systems:the Bethe--Salpeter equation in the spectral-integration technique in the case of the different quark masses  

E-Print Network (OSTI)

The Bethe--Salpeter equations for the quark-antiquark composite systems with different quark masses, such as $q\\bar s$ (with $q=u$,$d$), $q\\bar Q$ and $s \\bar Q$ (with $Q=c$,$b$), are written in terms of spectral integrals. For the mesons characterized by the mass $M$, spin $J$ and radial quantum number $n$, the equations are presented for the $(n,M^2)$-trajectories with fixed $J$. In the spectral-integral technique one can use the energy-dependent forces and get beyond instantaneous approximation. The mixing between states with different quark spin $S$ and angular momentum $L$ are also discussed.

A. V. Anisovich; V. V. Anisovich; V. N. Markov; M. A. Matveev; A. V. Sarantsev

2004-01-28T23:59:59.000Z

383

Das Mitteilungsblatt erscheint jeweils am 1. und 3. Mittwoch jeden Monats. Eigentmer, Herausgeber, Vervielfltigung und Vertrieb: Zentrale Dienste der Universitt Innsbruck,  

E-Print Network (OSTI)

bis 16 für die Studien: D ?bersetzen und Dolmetschen (Deutsch, Englisch, Französisch, Italienisch für die Studien: D Deutsche Philologie BA Germanistik MA Germanistik D Sprachwissenschaft Dr für Chemie und Pharmazie Univ.-Prof. Mag. Dr. Hermann Stuppner (V: Univ.-Prof. Mag. Dr. Andreas

Breu, Ruth

384

Electric polarizability of the neutron in dynamical quark ensembles  

E-Print Network (OSTI)

The background field method for measuring the electric polarizability of the neutron is adapted to the dynamical quark case, resulting in the calculation of (certain space-time integrals over) three- and four-point functions. Particular care is taken to disentangle polarizability effects from the effects of subjecting the neutron to a constant background gauge field; such a field is not a pure gauge on a finite lattice and engenders a mass shift of its own. At a pion mass of m_pi = 759 MeV, a small, slightly negative electric polarizability is found for the neutron.

Michael Engelhardt

2007-10-09T23:59:59.000Z

385

J/psi Production in Quark-Gluon Plasma  

E-Print Network (OSTI)

We study J/psi production at RHIC and LHC energies with both initial production and regeneration. We solve the coupled set of transport equation for the J/psi distribution in phase space and the hydrodynamic equation for evolution of quark-gluon plasma. At RHIC, continuous regeneration is crucial for the J/psi momentum distribution while the elliptic flow is still dominated by initial production. At LHC energy, almost all the initially created J\\psis are dissociated in the medium and regeneration dominates the J/psi properties.

Li Yan; Pengfei Zhuang; Nu Xu

2006-08-03T23:59:59.000Z

386

Color Diffusion and Conductivity in a Quark-Gluon Plasma  

E-Print Network (OSTI)

Color diffusion is shown to be an important dissipative property of quark-gluon plasmas that rapidly damps collective color modes. We derive the characteristic color relaxation time scale, $t_c\\approx (3\\alpha_s T \\log(m_E/m_M ))^{-1}$, showing its sensitivity to the ratio of the static color electric and magnetic screening masses. This leads to a surprisingly small color conductivity, $\\sigma_c\\approx 2 T/\\log(m_E/m_M)$, which in fact vanishes in the semi-classical (1-loop) limit.

Alexei V. Selikhov; Miklos Gyulassy

1993-07-07T23:59:59.000Z

387

Gamma-Ray Bursts from Primordial Quark Objects in Space  

E-Print Network (OSTI)

We investigate the possibility that gamma-ray bursts originate in a concentric spherical shell with a given average redshift and find that this is indeed compatible with the data from the third BATSE (3B) catalog. It is also shown that there is enough freedom in the choice of unknown burst properties to allow even for extremely large distances to the majority of bursts. Therefore, we speculate about an early, and very energetic, origin of bursts, and suggest that they come from phase transitions in massive objects of pure quark matter, left over from the Big Bang.

B. Anoushirvani; D. Enstrm; S. Fredriksson; J. Hansson; P. kvist; A. Nicolaidis; S. Ekelin

1997-11-28T23:59:59.000Z

388

Top quark production at the Tevatron at NNLO.  

E-Print Network (OSTI)

of Nuclear Physics of the Office of High Energy and Nuclear Physics of the U.S. Department of Energy under Contract No. DE-AC-03-76SF00098. References [1] N. Kidonakis and R. Vogt, hep-ph/0308222. [2] N. Kidonakis, hep-ph/0303186. [3] N. Kidonakis and G... , UK bNuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA and Physics Department, University of California at Davis, Davis, CA 95616, USA Abstract We present results for top quark production at the Tevatron including...

Kidonakis, Nikolaos; Vogt, Ramona

389

Quark-gluon plasma in an external magnetic field  

E-Print Network (OSTI)

Using numerical simulations of lattice QCD we calculate the effect of an external magnetic field on the equation of state of the quark-gluon plasma. The results are obtained using a Taylor expansion of the pressure with respect to the magnetic field for the first time. The coefficients of the expansion are computed to second order in the magnetic field. Our setup for the external magnetic field avoids complications arising from toroidal boundary conditions, making a Taylor series expansion straightforward. This study is exploratory and is meant to serve as a proof of principle.

L. Levkova; C. DeTar

2013-09-04T23:59:59.000Z

390

Self-consistent quasiparticle model for quark-gluon plasma  

E-Print Network (OSTI)

Here we present a self-consistent quasi-particle model for quark-gluon plasma and apply it to explain the non-ideal behaviour seen in lattice simulations. The basic idea, borrowed from electrodynamic plasma, is that the gluons acquire mass as it propagates through plasma due to collective effects and is approximately equal to the plasma frequency. The statistical mechanics and thermodynamics of such a system is studied by treating it as an ideal gas of massive gluons. Since mass or plasma frequency depends on density, which itself is a thermodynamic quantity, the whole problem need to be solved self-consistently.

Vishnu M. Bannur

2006-09-19T23:59:59.000Z

391

Charged Higgs production with a top quark at the LHC.  

E-Print Network (OSTI)

ar X iv :h ep -p h/ 04 06 17 9v 1 1 6 Ju n 20 04 Cavendish-HEP-04/17 Charged Higgs production with a top quark at the LHC1 Nikolaos Kidonakis Cavendish Laboratory, University of Cambridge Madingley Road, Cambridge CB3 0HE, UK E-mail: kidonaki... @hep.phy.cam.ac.uk Abstract I discuss charged Higgs production via the process bg ? tH? at the LHC. I show that the cross section is dominated by soft-gluon corrections and I provide results for its dependence on the charged Higgs mass and on the scale, including higher...

Kidonakis, Nikolaos

392

Heavy-quark production at large rapidities at hadron colliders.  

E-Print Network (OSTI)

to those partonic subprocesses that feature a gluon exchange in the t-channel; this happens for gg ? QQg and qg ? QQq, and it is peculiar to the NLO computations of quark pair production, as opposed to Born-level predictions, in which only fermions... -energy limit is QQ+1 jet production. In this case the partonic subprocesses gg ? QQg and qg ? QQq, which feature a gluon exchange in the t-channel, are O(?3S) at the Born level. This can also be considered as a reformulation of the standard Mueller...

Andersen, Jeppe R; Del Duca, Vittoria; Frixione, Stefano; Maltoni, Fabio; Stirling, W James

393

NLO QCD CORRECTIONS TO HADRONIC HIGGS PRODUCTION WITH HEAVY QUARKS.  

SciTech Connect

The production of a Higgs boson in association with a pair of t{bar t} or b{bar b} quarks plays a very important role at both the Tevatron and the Large Hadron Collider. The theoretical prediction of the corresponding cross sections has been improved by including the complete next-to-leading order QCD corrections. After a brief description of the most relevant technical aspects of the calculation, we review the results obtained for both the Tevatron and the Large Hadron Collider.

DAWSON,S.; JACKSON,C.; ORR,L.; REINA,L.; WACHEROTH,D.

2003-07-02T23:59:59.000Z

394

QuarkNet Reports | U.S. DOE Office of Science (SC)  

Office of Science (SC) Website

QuarkNet Reports QuarkNet Reports High Energy Physics Advisory Panel (HEPAP) HEPAP Home Meetings Members .pdf file (20KB) Charges/Reports Charter .pdf file (44KB) HEP Committees of Visitors HEP Home Charges/Reports QuarkNet Reports Print Text Size: A A A RSS Feeds FeedbackShare Page DOE/NSF Status Review of QuarkNet .pdf file (54KB) (May 2006) DOE/NSF Status Review of QuarkNet (May 2005) - no report available DOE/NSF Status Review of QuarkNet .pdf file (67KB) (March 2004) DOE/NSF Status Review of the QuarkNet Project, .pdf file (46KB) (February 2003) DOE/NSF Status Review of QuarkNet Project .pdf file (74KB) (December 2001) Last modified: 3/18/2013 10:33:55 AM Share Page Share with Facebook Facebook External link Share with Twitter Twitter External link Share with Google Bookkmarks Google Bookmarks External link

395

The Nuclear-Matter Response in the Quark String-flip Model  

E-Print Network (OSTI)

Nuclear matter is modeled directly in terms of its constituent quarks. A many-body string-flip potential is used that confines quarks within hadrons, enables the hadrons to separate without generating van der Waals forces, and is symmetric in all quark coordinates. We present variational Monte Carlo results for the ground-state properties of large, three-dimensional systems. A phase transition from nuclear to quark matter is observed which is characterized by a dramatic rearrangement of strings. We report on exact calculations of the dynamic response of many-quark systems in one spatial dimension. At low density and small momentum transfers the response is substantially larger than that of a free Fermi gas of quarks; this suggests that there is a coherent response from all the quarks inside the hadron. This coherence, however, is incomplete, as the response is suppressed relative to that of a free Fermi gas of nucleons due to the internal quark substructure of the hadron.

Jorge Piekarewicz

1996-09-16T23:59:59.000Z

396

Charged pion polarizability in the nonlocal quark model of Nambu-Jona-Lasinio type  

E-Print Network (OSTI)

The polarizability of a charged pion is estimated in the framework of the nonlocal chiral quark model of the Nambu--Jona-Lasinio type. Nonlocality is described by quark form factors of the Gaussian type. It is shown that the polarizability in this model is very sensitive to the form of nonlocality and choice of the model parameters.

A. E. Radzhabov; M. K. Volkov

2004-03-12T23:59:59.000Z

397

Impact of Four-Quark Condensates on In-Medium Effects of Hadrons 1  

E-Print Network (OSTI)

Abstract. Spectral properties of hadrons in nuclear matter are treated in the framework of QCD sum rules. The influence of the ambient strongly interacting medium is encoded in various condensates. Especially, the structure of different four-quark condensates and their density dependencies in light quark systems are exemplified for the ? meson and the nucleon.

R. Thomas; T. Hilger; S. Zschocke; B. Kmpfer

2006-01-01T23:59:59.000Z

398

Precision measurements of the top quark mass and width with the D0 detector  

Science Conference Proceedings (OSTI)

Since the discovery of the top quark in 1995 at the Fermliab Tevatron Collider, top quark properties have been measured with ever higher precision. In this article, recent measurements of the top quark mass and its width using up to 3.6 fb{sup -1} of D0 data are summarized. Different techniques and final states have been examined and no deviations within these measurements have been observed. In addition to the direct measurements, a measurement of the top quark mass from its production cross section and a measurement of the top-antitop quark mass difference are discussed. With a mass of 173.3 {+-} 1.1 GeV, the top quark is the heaviest of all known fundamental particles. Due to the high mass, its Yukawa coupling is close to unity suggesting that it may play a special role in electroweak symmetry breaking. Precise measurements of both, the W boson and the top quark mass, constrain the mass of the yet unobserved Higgs boson and allow to restrict certain extensions of the Standard Model. At the Tevatron collider with a center-of-mass energy of 1.96 TeV, 85% of the top quark pairs are produced in quark-antiquark annihilation; 15% originate from gluon fusion. Top quarks are predicted to decay almost exclusively to a W boson and a bottom quark. According to the number of hadronic W decays, top events are classified into all-jets, lepton+jets and dilepton events. The lepton+jets channel is characterized by four jets, one isolated, energetic charged lepton and missing transverse energy. With 30%, the branching fraction of the lepton+jets channel is about seven times larger than the one of the dilepton channel whereas the signal to background ratio is about three times smaller. The main background in this final state comes from W +jets events. Instrumental background arises from events in which a jet is misidentified as an electron and events with heavy hadrons that decay into leptons which pass the isolation requirements. The topology of the dilepton channel is described by two jets, two isolated, energetic charged leptons and significant missing transverse energy from the undetected neutrinos. The main background are Z + jets and diboson events (WW/WZ/ZZ+jets) as well as instrumental background as characterized above. At the D0 experiment, different techniques are used to measure the top quark mass. They are summarized in the following sections together with the first measurement of the top anti-top quark mass difference and the first precise determination of the top quark width.

Grohsjean, Alexander; /IRFU, SPP, Saclay

2010-01-01T23:59:59.000Z

399

Top-quark asymmetry and the search for a light hadronic resonance in association with a single top quark  

Science Conference Proceedings (OSTI)

The exchange of a light t-channel flavor-changing gauge boson, V', with mass {approx}m{sub top} remains a leading explanation for the anomalous forward-backward asymmetry in top-quark production at the Tevatron. Unlike other ideas, including heavier t-channel mediators, the light V' model is not easily seen in the m{sub tt} distribution. We advocate a more promising strategy. While current analyses at hadron colliders may not be sensitive, we propose searching for a jj resonance in association with single top that may allow discovery in existing data. Deviations in the lepton charge asymmetry in this sample should also be present.

Jung, Sunghoon; Pierce, Aaron [Michigan Center for Theoretical Physics, Department of Physics, University of Michigan, Ann Arbor, Michigan 48109 (United States); Wells, James D. [Michigan Center for Theoretical Physics, Department of Physics, University of Michigan, Ann Arbor, Michigan 48109 (United States); CERN Theoretical Physics (PH-TH), CH-1211 Geneva 23 (Switzerland)

2011-11-01T23:59:59.000Z

400

WA_1995_039_USABC_Waiver_of_Domestic_and_Foreign_Rights_Unde...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

ofDomesticandForeignRightsUnde.pdf More Documents & Publications WA1993032FORDMOTORCOMPANYWaiverofDomesticandForeig.pdf WA97038FORDMOTORCOMPANYWaiverofDomes...

Note: This page contains sample records for the topic "quarks und leptonen" from the National Library of EnergyBeta (NLEBeta).
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to obtain the most current and comprehensive results.


401

Fats and Oils Handbook (Nahrungsfette und le)Chapter 11 Acknowledgements  

Science Conference Proceedings (OSTI)

Fats and Oils Handbook (Nahrungsfette und le) Chapter 11 Acknowledgements eChapters Press Downloadable pdf of Chapter 11 Acknowledgements from the book ...

402

Fats and Oils Handbook (Nahrungsfette und le)Chapter 12 Bibliography  

Science Conference Proceedings (OSTI)

Fats and Oils Handbook (Nahrungsfette und le) Chapter 12 Bibliography eChapters Press Downloadable pdf of Chapter 12 Bibliography from the book

403

Modelle und Methoden fr die Bestandsauslegung in Heijunka-nivellierten Supply Chains.  

E-Print Network (OSTI)

??In dieser Arbeit werden analytische Bestandsmodelle fr die Heijunka-Nivellierung unter Bercksichtigung schwankender Nachfrage- und Produktionsprozesse entwickelt. Dies ist in der Praxis von grerer Bedeutung, als (more)

Veit, Martin B.

2010-01-01T23:59:59.000Z

404

Ein Verfahren zur graphentheoretischen Dekomposition und algebraischen Reduktion von komplexen Energiesystemmodellen.  

E-Print Network (OSTI)

??Aufgrund der Endlichkeit fossiler Rohstoffe und den momentanen CO2-Minderungszielen ist ein grundlegender Wandel in der Energiewirtschaft zu erwarten. Zur Untersttzung der notwendigen langfristigen, strategischen Energieplanung (more)

Stuible, Achim

2002-01-01T23:59:59.000Z

405

Modellgesttzte Bedarfs- und Wirtschaftlichkeitsanalyse von Energiespeichern zur Integration erneuerbarer Energien in Deutschland.  

E-Print Network (OSTI)

??Der bergang zu einem klimafreundlichen Energiesystem ist eines der zentralen Ziele deutscher und europischer Energiepolitik. Der Ausbau erneuerbarer Energien ist eine wichtige Voraussetzung fr das (more)

Genoese, Fabio

2013-01-01T23:59:59.000Z

406

Ein Beitrag zur Verbesserung und Erweiterung der Lidar-Signalverarbeitung fr Fahrzeuge.  

E-Print Network (OSTI)

??Laserscanner werden in Fahrzeugen zur Umfelderfassung eingesetzt. Die vorliegende Arbeit untersucht, wie aus den Messungen des Laserscanners der Abstand und die Bewegung anderer Fahrzeuge bestimmt (more)

Kapp, Andreas

2007-01-01T23:59:59.000Z

407

QCD THERMODYNAMICS WITH NF=2+1 NEAR THE CONTINUUM LIMIT AT REALISTIC QUARK MASSES.  

Science Conference Proceedings (OSTI)

We report on our study of QCD thermodynamics with 2 + 1 flavors of dynamical quarks. In this proceeding we present several thermodynamic quantities and our recent calculation of the critical temperature. In order to investigate the thermodynamic properties of QCD near the continuum limit we adopt improved staggered (p4) quarks coupled with tree-level Symanzik improved glue on N{sub t} = 4 and 6 lattices. The simulations are performed with a physical value of the strange quark mass and light quark masses which are in the range of m{sub q}/m{sub s} = 0.05 - 0.4. The lightest quark mass corresponds to a pion mass of about 150 MeV.

UMEDA, T.

2006-07-23T23:59:59.000Z

408

A handbook of vector-like quarks: mixing and single production  

E-Print Network (OSTI)

We obtain constraints on the mixing of vector-like quarks coupling predominantly to the third generation. We consider all (seven) possible types of vector-like quarks, individually. The constraints are derived from oblique corrections and Z -> b bbar measurements at LEP and SLC. We investigate the implications of these constraints on LHC phenomenology, concerning the decays of the heavy quarks and their single production. We also explore indirect effects of heavy quark mixing in top and bottom couplings. The most remarkable of these effects is the possibility of explaining the anomalous forward-backward asymmetry in Z -> b bbar at LEP, with a hypercharge -5/6 doublet. We also study the impact of the new quarks on single Higgs production at the LHC and Higgs decay.

J. A. Aguilar-Saavedra; R. Benbrik; S. Heinemeyer; M. Perez-Victoria

2013-06-03T23:59:59.000Z

409

A handbook of vector-like quarks: mixing and single production  

E-Print Network (OSTI)

We obtain constraints on the mixing of vector-like quarks coupling predominantly to the third generation. We consider all (seven) relevant types of vector-like quarks, individually. The constraints are derived from oblique corrections and Z -> b bbar measurements at LEP and SLC. We investigate the implications of these constraints on LHC phenomenology, concerning the decays of the heavy quarks and their single production. We also explore indirect effects of heavy quark mixing in top and bottom couplings. A remarkable effect is the possibility of explaining the anomalous forward-backward asymmetry in Z -> b bbar at LEP, with a hypercharge -5/6 doublet. We also study the impact of the new quarks on single Higgs production at the LHC and Higgs decay.

J. A. Aguilar-Saavedra; R. Benbrik; S. Heinemeyer; M. Perez-Victoria

2013-06-03T23:59:59.000Z

410

Searches for flavor-changing neutral currents and single top quarks at D0  

SciTech Connect

I present brief descriptions of two top quark analyses performed using D0 data from p{bar p} collisions at {radical}s = 1.96 TeV: the search for flavor-changing neutral-current couplings (FCNC) of the top quark with a charm or an up quark with the exchange of a gluon, and the search for the standard model production of single top quarks. The search for FCNC couplings of a gluon to the top quark is the first such analysis at hadron colliders. I describe the application of the Bayesian approach for comparing our physics models to the observed data in both analyses and, in one of them, to separate small signals from large backgrounds.

Jain, Supriya; /Oklahoma U.

2008-05-01T23:59:59.000Z

411

Four-quark condensates and chiral symmetry restoration in a resonance gas model  

E-Print Network (OSTI)

As an alternative to the two-quark condensate we propose a specific four-quark condensate as an order parameter of chiral symmetry restoration. We show that this four-quark condensate is closer connected to observable quantities. Within a resonance gas model we calculate the in-medium changes of two- and four-quark condensate as functions of temperature and baryo-chemical potential. In this way we estimate the line of chiral symmetry restoration in the temperature-potential plane and also as a function of energy and baryon density. It turns out that the line determined from the vanishing of the four-quark condensate is extremely constant as a function of the energy density.

Stefan Leupold

2006-04-06T23:59:59.000Z

412

Inconsistencies of Neutrino and Quark Conjectures and their Negative Environmental Implications  

E-Print Network (OSTI)

By using a language as accessible to a broad audience as possible, in this note we present evidence suggesting scientific caution prior to final claims that neutrinos and quarks are actual physical particles existing in our spacetime. We review historical and recent evidence dismissing the existence of neutrinos and quarks as physical particles, and outline recent theories representing experimental data without their existence. We also identify the negative implications for environmental issues of the neutrino and quark conjectures since they imply the suppression of due scientific process on new clean energies predicted by new structure models of hadrons with massive physical constituents produced free in spontaneous or stimulated decays. The note ends with the need of continuing theoretical and experimental research on neutrino and quark conjectures, but complemented, for evident scientific democracy, accountability and societal needs, with theoretical and experimental studies on alternative theories without the neutrino and quark conjectures and their prediction of new clean energies.

Ruggero Maria Santilli

2006-03-30T23:59:59.000Z

413

The Polarised Valence Quark Distribution from semi-inclusive DIS  

E-Print Network (OSTI)

The semi-inclusive difference asymmetry A^{h+ - h-} for hadrons of opposite charge has been measured by the COMPASS experiment at CERN. The data were collected in the years 2002-2004 using a 160 GeV polarised muon beam scattered off a large polarised 6-LiD target and cover the range 0.006 < x < 0.7 and 1 < Q^2 < 100 (GeV/c)^2. In leading order QCD (LO) the asymmetry A_d^{h+ - h-} measures the valence quark polarisation and provides an evaluation of the first moment of Delta u_v + Delta d_v which is found to be equal to 0.40 +- 0.07 (stat.) +- 0.05 (syst.) over the measured range of x at Q^2 = 10 (GeV/c)^2. When combined with the first moment of g_1^d previously measured on the same data, this result favours a non-symmetric polarisation of light quarks Delta u-bar = -Delta d-bar at a confidence level of two standard deviations, in contrast to the often assumed symmetric scenario Delta u-bar = Delta d-bar = Delta s-bar = Delta s.

Alekseev, M; Alexandrov, Yu; Alexeev, G D; Amoroso, A; Arbuzov, A; Badelek, B; Balestra, F; Ball, J; Barth, J; Baum, G; Bedfer, Y; Bernet, C; Bertini, R; Bettinelli, M; Birsa, R; Bisplinghoff, J; Bordalo, P; Bradamante, Franco; Bravar, A; Bressan, A; Brona, G; Burtin, E; Bussa, M P; Chapiro, A; Chiosso, M; Cicuttin, A; Colantoni, M; Costa, S; Crespo, M L; Dalla Torre, S; Dafni, T; Das, S; Das-Gupta, S S; De Masi, R; Dedek, N; Denisov, O Yu; Dhara, L; Daz, V; Dinkelbach, A M; Donskov, S V; Dorofeev, V A; Doshita, N; Duic, V; Dnnweber, W; Eversheim, P D; Eyrich, W; Fabro, M; Faessler, M; Falaleev, V; Ferrero, A; Ferrero, L; Finger, M; Fischer, H; Franco, C; Franz, J; Friedrich, J M; Frolov, V; Garfagnini, R; Gautheron, F; Gavrichtchouk, O P; Gazda, R; Gerassimov, S; Geyer, R; Giorgi, M; Gobbo, B; Grtz, S; Gorin, A M; Grabmuller, S; Grajek, O A; Grasso, A; Grube, B; Gushterski, R; Guskov, A; Haas, F; Hannappel, J; Von Harrach, D; Hasegawa, T; Heckmann, J; Hedicke, S; Heinsius, F H; Hermann, R; Hess, C; Hinterberger, F; Von Hodenberg, M; Horikawa, N; Horikawa, S; D'Hose, N; Ilgner, C; Ioukaev, A I; Ishimoto, S; Ivanov, O; Ivanshin, Yu; Iwata, T; Jahn, R; Janata, A; Jasinski, P; Joosten, R; Jouravlev, N I; Kabuss, E; Kang, D; Ketzer, B; Khaustov, G V; Khokhlov, Yu A; Kisselev, Yu; Klein, F; Klimaszewski, K; Koblitz, S; Koivuniemi, J H; Kolosov, V N; Komissarov, E V; Kondo, K; Knigsmann, K C; Konorov, I; Konstantinov, V F; Korentchenko, A S; Korzenev, A; Kotzinian, A M; Koutchinski, N A; Kuznetsov, O; Kral, A; Kravchuk, N P; Kroumchtein, Z V; Khn, R; Kunne, Fabienne; Kurek, K; Ladygin, M E; Lamanna, M; Le Goff, J M; Lednev, A A; Lehmann, A; Lichtenstadt, J; Liska, T; Ludwig, I; Maggiora, A; Maggiora, M; Magnon, A; Mallot, G K; Mann, A; Marchand, C; Marroncle, J; Martin, A; Marzec, J; Massmann, F; Matsuda, T; Maksimov, A N; Meyer, W; Mielech, A; Mikhailov, Yu V; Moinester, M A; Mutter, A; Nagaytsev, A; Nagel, T; Nahle, O; Nassalski, J; Neliba, S; Nerling, F; Neubert, S; Neyret, D P; Nikolaenko, V I; Nikolaev, K; Olshevskii, A G; Ostrick, M; Padee, A; Pagano, P; Panebianco, S; Panknin, R; Panzieri, D; Paul, S; Pawlukiewicz-Kaminska, B; Peshekhonov, D V; Peshekhonov, V D; Piragino, G; Platchkov, S; Pochodzalla, J; Polak, J; Polyakov, V A; Pretz, J; Procureur, S; Quintans, C; Rajotte, J F; Ramos, S; Rapatsky, V; Reicherz, G; Richter, A; Reggiani, D; Robinet, F; Rocco, E; Rondio, E; Rozhdestvensky, A M; Ryabchikov, D I; Samoylenko, V D; Sandacz, A; Santos, H; Sapozhnikov, M G; Sarkar, S; Savin, I A; Schiavon, Paolo; Schill, C; Schmitt, L; Schonmeier, P; Schroder, W; Shevchenko, O Yu; Siebert, H W; Silva, L; Sinha, L; Sissakian, A N; Slunecka, M; Smirnov, G I; Sosio, S; Sozzi, F; Srnka, A; Stinzing, F; Stolarski, M; Sugonyaev, V P; Sulc, M; Sulej, R; Tchalishev, V V; Tessaro, S; Tessarotto, F; Teufel, A; Tkatchev, L G; Venugopal, G; Virius, M; Vlassov, N V; Vossen, A; Webb, R; Weise, E; Weitzel, Q; Windmolders, R; Wirth, S; Wislicki, W; Zaremba, K; Zavertyaev, M; Zemlyanichkina, E; Zhao, J; Ziegler, R; Zvyagin, A

2008-01-01T23:59:59.000Z

414

QCD sum rule determination of the charm-quark mass  

Science Conference Proceedings (OSTI)

QCD sum rules involving mixed inverse moment integration kernels are used in order to determine the running charm-quark mass in the MS scheme. Both the high and the low energy expansion of the vector current correlator are involved in this determination. The optimal integration kernel turns out to be of the form p(s)=1-(s{sub 0}/s){sup 2}, where s{sub 0} is the onset of perturbative QCD. This kernel enhances the contribution of the well known narrow resonances, and reduces the impact of the data in the range s{approx_equal}20-25 GeV{sup 2}. This feature leads to a substantial reduction in the sensitivity of the results to changes in s{sub 0}, as well as to a much reduced impact of the experimental uncertainties in the higher resonance region. The value obtained for the charm-quark mass in the MS scheme at a scale of 3 GeV is m{sub c}(3 GeV)=987{+-}9 MeV, where the error includes all sources of uncertainties added in quadrature.

Bodenstein, S. [Centre for Theoretical and Mathematical Physics, University of Cape Town, Rondebosch 7700 (South Africa); Bordes, J.; Penarrocha, J. [Departamento de Fisica Teorica, Universitat de Valencia, and Instituto de Fisica Corpuscular, Centro Mixto Universitat de Valencia-CSIC (Spain); Dominguez, C. A. [Centre for Theoretical and Mathematical Physics, University of Cape Town, Rondebosch 7700 (South Africa); Department of Physics, Stellenbosch University, Stellenbosch 7600 (South Africa); Schilcher, K. [Institut fuer Physik, Johannes Gutenberg-Universitaet Staudingerweg 7, D-55099 Mainz (Germany)

2011-04-01T23:59:59.000Z

415

Evidence for single top quark production using Bayesian neural networks  

SciTech Connect

We present results of a search for single top quark production in p{bar p} collisions using a dataset of approximately 1 fb{sup -1} collected with the D0 detector. This analysis considers the muon+jets and electron+jets final states and makes use of Bayesian neural networks to separate the expected signals from backgrounds. The observed excess is associated with a p-value of 0.081%, assuming the background-only hypothesis, which corresponds to an excess over background of 3.2 standard deviations for a Gaussian density. The p-value computed using the SM signal cross section of 2.9 pb is 1.6%, corresponding to an expected significance of 2.2 standard deviations. Assuming the observed excess is due to single top production, we measure a single top quark production cross section of {sigma}(p{bar p} {yields} tb + X, tqb + X) = 4.4 {+-} 1.5 pb.

Kau, Daekwang; /Florida State U.

2007-08-01T23:59:59.000Z

416

Heavy-quark probes of the quark-gluon plasma and interpretation of recent data taken at the BNL Relativistic Heavy Ion Collider  

E-Print Network (OSTI)

Thermalization and collective flow of charm (c) and bottom (b) quarks in ultrarelativistic heavy-ion collisions are evaluated based on elastic parton rescattering in an expanding quark-gluon plasma (QGP). We show that resonant interactions in a strongly interacting QGP (sQGP), as well as parton coalescence, can play an essential role in the interpretation of recent data from the BNL Relativistic Heavy-Ion Collider (RHIC), and thus illuminate the nature of the sQGP and its hadronization. Our main assumption, motivated by recent findings in lattice quantum chromodynamics, is the existence of D- and B-meson states in the sQGP, providing resonant cross sections for heavy quarks. Pertinent drag and diffusion coefficients are implemented into a relativistic Langevin simulation to compute transverse-momentum spectra and azimuthal asymmetries (v(2)) of b- and c-quarks in Au-Au collisions at RHIC. After hadronization into D- and B-mesons using quark coalescence and fragmentation, associated electron-decay spectra and v(2) are compared to recent RHIC data. Our results suggest a reevaluation of radiative and elastic quark energy-loss mechanisms in the sQGP.

van Hees, H.; Greco, V.; Rapp, Ralf.

2006-01-01T23:59:59.000Z

417

Mensen und Cafeterias der Universitt Bern Ist Ihr (Wissens)durst noch nicht gestillt? Gnnen Sie sich eine kulinarische Pause!  

E-Print Network (OSTI)

Mensen und Cafeterias der Universität Bern Ist Ihr (Wissens)durst noch nicht gestillt? Gönnen Sie Unitobler Gesellschaftsstr. 2 Chemie Vetsuisse Uni Engehalde Hunger, Durst? Pause? Auftanken? Sehen und

Richner, Heinz

418

Hhere Effizienz im Umgang mit Ressourcen bei gleichzeitiger Produktivittssteigerung ABB ist in der Schweiz auf diesem Weg mit weltweit fhrenden energiesparenden Lsungen dabei. Erfahren Sie mehr ber ABB und ihre Energie-und Automatisierungs-Technologien  

E-Print Network (OSTI)

;#12;#12;#12;#12;#12;#12;#12;#12;#12;#12;AGROLA setzt auf Erneuerbare Energie AGROLA folgt dem Weg der Sie mehr über ABB und ihre Energie- und Automatisierungs-Technologien unter www.abb.ch © 2007 ABB #12 Erneuer- baren Energie aus Biomasse mit ?berzeugung und so ist die Einführung der beiden neuen

419

Density-Dependent Relations among Properties of Hadronic Matter and Applications to Hadron-Quark Stars  

SciTech Connect

Density-dependent relations among the saturation properties of symmetric nuclear matter and hyperonic matter, and properties of hadron-(strange) quark stars are shown by applying the conserving nonlinear {sigma}-{omega}-{rho} hadronic mean-field theory. Nonlinear interactions are renormalized self-consistently as effective coupling constants, effective masses, and sources of equations of motion by maintaining thermodynamic consistency to the mean-field approximation. Effective masses and coupling constants at the saturation point of symmetric nuclear matter simultaneously determine the binding energy and saturation properties of hyperonic matter. The coupling constants expected from the hadronic mean-field model and SU(6) quark model for the vector coupling constants are compared by calculating masses of hadron-quark neutron stars. The nonlinear {sigma}-{omega}-{rho} mean-field approximation with vacuum fluctuation corrections and strange quark matter defined by the MIT-bag model were employed to examine properties of hadron-(strange) quark stars. We found that hadron-(strange) quark stars become more stable at high densities compared to pure hadronic and strange quark stars.

Uechi, Hiroshi [Department of Distributions and Communication Sciences, Osaka Gakuin University, Osaka (Japan); Uechi, Schun T. [Research Center for Nuclear Physics (RCNP), Osaka University, Osaka (Japan)

2011-05-06T23:59:59.000Z

420

Burning of an hadronic star into a quark or a hybrid star  

E-Print Network (OSTI)

We study the hydrodynamical transition from an hadronic star into a quark or a hybrid star. We discuss the possible mode of burning, using a fully relativistic formalism and realistic Equations of State in which hyperons can be present. We take into account the possibility that quarks form a diquark condensate. We also discuss the formation of a mixed phase of hadrons and quarks, and we indicate which region of the star can rapidly convert in various possible scenarios. An estimate of the final temperature of the system is provided. We find that the conversion process always corresponds to a deflagration and never to a detonation. Hydrodynamical instabilities can develop on the front. We estimate the increase in the conversion's velocity due to the formation of wrinkles and we find that, although the increase is significant, it is not sufficient to transform the deflagration into a detonation in essentially all realistic scenarios. Concerning convection, it does not always develop. In particular the system does not develop convection if hyperons are not present in the initial phase and if the newly formed quark phase is made of ungapped (or weakly gapped) quarks. At the contrary, the process of conversion from ungapped quark matter to gapped quarks always allows the formation of a convective layer. Finally, we discuss possible astrophysical implications of our results.

Alessandro Drago; Andrea Lavagno; Irene Parenti

2005-12-30T23:59:59.000Z

Note: This page contains sample records for the topic "quarks und leptonen" 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

Quark-Hadron Duality and Nucleon Valence Structure \  

DOE Green Energy (OSTI)

A newly-obtained data sample of inclusive electron-nucleon scattering from deuterium and hydrogen targets at Jefferson Lab has been analyzed for precision tests of quark-hadron duality. In all cases, duality appears to be a non-trivial dynamic property of the nucleon structure function. Assuming duality, the proton magnetic form factor is extracted from the inelastic data alone, and found to be in good agreement with the world's data. Higher twist contributions are found to be small on average, even down to Q^2 ~ 0 5 GeV^2.The investigation yields a scaling curve from duality arguments which resembles deep-inelastic neutrino-nucleus scattering data, indicating a potential sensitivity to valence and valence-like structure.

Keppel, Cynthia

1999-01-01T23:59:59.000Z

422

Strange quarks in the nucleon sea: Results from HAPPEX II  

DOE Green Energy (OSTI)

The HAPPEX Collaboration measured parity-violating electron scattering from 4He(e, e) and H(e, e) in 2004 and 2005 for Q2 ? 0.11 GeV2. Results for the strange-quark contributions to the electromagnetic form factors of the nucleon from the 2004 data will be reviewed. Preliminary results from the 2005 data, which have significantly greater statistical precision, are GsE = 0.004 0.014stat 0.013syst for Q2 = 0.0772 GeV2 from the helium data and GsE + 0.088 GsM = 0.004 0.011stat 0.005syst 0.004FF for Q2 = 0.1089 GeV2 from the hydrogen data.

K.A. Aniol; HAPPEX Collaboration

2007-03-01T23:59:59.000Z

423

Looking into the matter of light-quark hadrons  

E-Print Network (OSTI)

In tackling QCD, a constructive feedback between theory and extant and forthcoming experiments is necessary in order to place constraints on the infrared behaviour of QCD's \\beta-function, a key nonperturbative quantity in hadron physics. The Dyson-Schwinger equations provide a tool with which to work toward this goal. They connect confinement with dynamical chiral symmetry breaking, both with the observable properties of hadrons, and hence provide a means of elucidating the material content of real-world QCD. This contribution illustrates these points via comments on: in-hadron condensates; dressed-quark anomalous chromo- and electro-magnetic moments; the spectra of mesons and baryons, and the critical role played by hadron-hadron interactions in producing these spectra.

Craig D. Roberts

2011-09-28T23:59:59.000Z

424

Kinematics of Top Quark Final States: A Snowmass White Paper  

E-Print Network (OSTI)

This is the summary report of the Top Quark Kinematics working group prepared for Snowmass 2013. We survey the current state of theoretical predictions for top pair differential distributions, in both boosted and un-boosted regimes, and present an overview of uncertainties and prospects for top spin correlations. We study the prospects for measuring the inclusive SM top pair production asymmetry AFC at LHC 14 as a function of systematic error, and show that some improvement over current systematic uncertainties, as customarily handled, is required for observing a SM-size asymmetry. Cuts on top pair invariant mass and rapidity do not substantially alter this conclusion. We summarize the conclusions of contributed studies on alternate LHC measurements of the ttbar production asymmetry, in ttbar+jet final states and in forward top production at LHCb, both of which show good prospects for observing SM-size asymmetries in 50 fb-1 of data at LHC14.

Andreas Jung; Markus Schulze; Jessie Shelton

2013-09-11T23:59:59.000Z

425

Search for stable Strange Quark Matter in lunar soil  

E-Print Network (OSTI)

We report results from a search for strangelets (small chunks of Strange Quark Matter) in lunar soil using the Yale WNSL accelerator as a mass spectrometer. We have searched over a range in mass from A=42 to A=70 amu for nuclear charges 5, 6, 8, 9, and 11. No strangelets were found in the experiment. For strangelets with nuclear charge 8, a concentration in lunar soil higher than $10^{-16}$ is excluded at the 95% confidence level. The implied limit on the strangelet flux in cosmic rays is the most sensitive to date for the covered range and is relevant to both recent theoretical flux predictions and a strangelet candidate event found by the AMS-01 experiment.

Ke Han; Jeffrey Ashenfelter; Alexei Chikanian; William Emmet; Evan Finch; Andreas Heinz; Jes Madsen; Richard Majka; Benjamin Monreal; Jack Sandweiss

2009-03-29T23:59:59.000Z

426

Search for stable Strange Quark Matter in lunar soil  

E-Print Network (OSTI)

We report results from a search for strangelets (small chunks of Strange Quark Matter) in lunar soil using the Yale WNSL accelerator as a mass spectrometer. We have searched over a range in mass from A=42 to A=70 amu for nuclear charges 5, 6, 8, 9, and 11. No strangelets were found in the experiment. For strangelets with nuclear charge 8, a concentration in lunar soil higher than $10^{-16}$ is excluded at the 95% confidence level. The implied limit on the strangelet flux in cosmic rays is the most sensitive to date for the covered range and is relevant to both recent theoretical flux predictions and a strangelet candidate event found by the AMS-01 experiment.

Han, Ke; Chikanian, Alexei; Emmet, William; Finch, Evan; Heinz, Andreas; Madsen, Jes; Majka, Richard; Monreal, Benjamin; Sandweiss, Jack

2009-01-01T23:59:59.000Z

427

M.Sc.Info-Veranstaltung, 21. Juni 2011 M.Sc. Chemie und Molecular Science  

E-Print Network (OSTI)

M.Sc.Info-Veranstaltung, 21. Juni 2011 M.Sc. Chemie und Molecular Science an der FAU Erlangen-Nürnberg Rainer Fink - Studiendekan Chemie / Mol.Sci. - #12;M.Sc.Info-Veranstaltung, 21. Juni 2011 Grundzüge der Masterstudiengänge Chemie und Molecular Science Qualifikation zu den Masterstudiengängen Modulwahl (Chemie

Stummer, Wolfgang

428

Naturwissenschaftlich-Technische Fakultt III Chemie, Pharmazie, Bio-und Werkstoffwissenschaften  

E-Print Network (OSTI)

Naturwissenschaftlich-Technische Fakultät III Chemie, Pharmazie, Bio- und Werkstoffwissenschaften Spannende Chemie-Vorträge für saarländische Schulen Die Saarbrücker Chemie-Professoren möchten den Chemieunterricht an saarländischen Schulen durch Schulbesuche und Vorträge zu allgemeinen Themen der Chemie

Mayberry, Marty

429

Aktuelle Trends in der dezentralen KWK Technologie Integration -Das kalifornische Frdermodell und  

E-Print Network (OSTI)

Kraftwerk von Alliance Power und FuelCell Energy zu kaufen. Die gesamten Projektkosten werden mit rund 5. In ?sterreich entsprechen die 0,1kg NOX/MWhel einem höheren Wert, aufgrund der höheren Güte der Kraftwerke und

430

Modul: 2 Modultitel: Grundlagen der Prvention und Gesundheitsfrderung Modulverantwortlicher: Prof. Dr. Ulla Walter  

E-Print Network (OSTI)

gesundheitliche Aufklärung (BZgA) (Hrsg) (2011). Leitbegriffe der Gesundheitsförderung und Prävention. Glossar zu Konzepten, Strategien und Methoden. Verlag für Gesundheitsförderung: Gamburg. Schwartz FW et al. (Hrsg University Press: Oxford. Walter U, Robra BP, Schwartz FW (2012). Prävention. In: Schwartz FW et al. (Hrsg

Manstein, Dietmar J.

431

Namen und Nachrichten MHHInfo April/Mai 2007 Privatdozent Dr. med.  

E-Print Network (OSTI)

Christiane Lieske, Angestellte in der Abteilung Klinische Chemie der MHH, Frau Margarete Marta Sellnik Einrichtungen der MHH ein an deutsche Verhältnisse und Traditionen angepasstes Departmentsystem vor: eine-Abteilung Klinische Chemie, in den Ruhestand. 1940 in Oberhausen geboren, studierte er ab 1960 Medizin in Bonn und

Manstein, Dietmar J.

432

1. Gas als inkompressibles Medium Schtzen Sie den Druck im Staupunkt und die Dichtende-  

E-Print Network (OSTI)

h 1. Gas als inkompressibles Medium Schätzen Sie den Druck im Staupunkt und die Dichteände- rung im ist. Unter welchen Bedingungen kann man ein Gas als ein inkompressibles Medium betrachten? 2 Kontaktgebietes, die Druckverteilung im Kontaktgebiet und die Eindrucktiefe als Funktion der Normalkraft zu bestim

Berlin,Technische Universität

433

Integration von dynamischer Verkehrssimulation und Wirkungsanalyse fr die Entwicklung ressourcenschonender Verkehrsmanagement-Strategien  

E-Print Network (OSTI)

Um zu verhindern, dass die Nutzung von Telematik zu unerwnschten negativen Effekten fhrt, mssen Verkehrsmanagement-Strategien jenseits der blichen nutzeroptimalen Lsungen entwickelt werden. Mit diesem Ziel werden in dieser Arbeit dynamische Verkehrssimulationsmodelle und verfeinerte Prognose- und Auswertungsmodelle gekoppelt, mit denen Strategien hinsichtlich ihrer Umweltwirkungen und wirtschaftlichen Effizienz bewertet werden knnen. Hierfr stehen dynamische, mikroskopische Verkehrsmodelle zur Verfgung, die im Rahmen des "stadtinfokln"-Projektes zu Prognoseinstrumenten weiter entwickelt werden. Als Ergebnis der Integration dieser Modelle mit Modellen zur strategischen Prognose und Bewertung von Verkehrswirkungen lassen sich erste Bandbreiten fr die Wirksamkeit und Effizienz einzelner Verkehrsmanagement-Manahmen abschtzen. Gleichzeitig wird die Notwendigkeit zur Verfeinerung der Umweltmodelle deutlich, um den dynamischen Aspekten des Verkehrsablaufes Rechnung zu tragen. Daher werden Modelle zur Emissionsprognose im Straenverkehr weiterentwickelt und mit vorhandenen Simulationsmodellen (PELOPS) abgestimmt, welche die Fahrdynamik der Fahrzeuge bercksichtigen. Auf Basis der Ergebnisse werden erste Szenarien fr Management-Strategien gezielt so entwickelt, dass vorgegebene Umwelt- und Sicherheitsziele erreicht und Wirtschaftlichkeitskriterien maximiert werden. Mittelfristig ist das Ziel, intelligente Entscheidungsuntersttzungssysteme aufzubauen, die Verkehrsmanagern bei aus gemessenen Verkehrsdaten rekonstruierten realen Verkehrssituationen effiziente, ressourcensparende Lsungen von Verkehrsproblemen offerieren.

A. Ghnemann; N. Eissfeldt; A. Benmimoun; D. Neunzig; P. Wagner

2001-01-01T23:59:59.000Z

434

Windenergieeinspeisung und Kraftwerksbetrieb VGB PowerTech 6/2009 35  

E-Print Network (OSTI)

auf Themen aus den Bereichen Offshore-Windenergie sowie Speicher und Netzintegration konzentrieren unterstützt Offshore-Windstudium Die Offshore-Windenergie bil- det das Kernstück beim Umbau der und Bre- men, nun mit dem berufsbegleitenden, international ausgerichteten Studium Offshore-Windenergie

Weber, Harald

435

Biomasse mit Satellit und PROMET Vista 2011 Tagung Energiemeteorologie, Bremerhaven, 6.4.2011  

E-Print Network (OSTI)

Biomasse mit Satellit und PROMET © Vista 2011 Tagung Energiemeteorologie, Bremerhaven, 6.4.2011 Dr PROMET #12;Biomasse mit Satellit und PROMET © Vista 2011 Motivation · Für die Biogasproduktion ist eine Vorhersagen zu erhalten. · Die Fernerkundung mit Satelliten kann die oberirdische, grüne Biomasse räumlich

Heinemann, Detlev

436

Endbericht zum Projekt: Entwicklung statistischer und geometrischer Verfahren zur Charakterisierung von  

E-Print Network (OSTI)

Arbeits­ und Ergebnisbericht 1999 ­ 2000 ­ 2001 (vom gedruckten Exemplar abweichende Formatierung) #12;#12;ARBEITS­ UND ERGEBNISBERICHT 1999­2000­2001 SFB 393 An die Deutsche Forschungsgemeinschaft SM #12;#12;INHALTSVERZEICHNIS 1 Allgemeiner Teil/Zusammenfassung 5 1.1 Wissenschaftliche Entwicklung

Kurth, Winfried

437

The neutron electric dipole form factor in the perturbative chiral quark model  

E-Print Network (OSTI)

We calculate the electric dipole form factor of the neutron in a perturbative chiral quark model, parameterizing CP-violation of generic origin by means of effective electric dipole moments of the constituent quarks and their CP-violating couplings to the chiral fields. We discuss the relation of these effective parameters to more fundamental ones such as the intrinsic electric and chromoelectric dipole moments of quarks and the Weinberg parameter. From the existing experimental upper limits on the neutron EDM we derive constraints on these CP-violating parameters.

Claudio Dib; Amand Faessler; Thomas Gutsche; Sergey Kovalenko; Jan Kuckei; Valery E. Lyubovitskij; Kem Pumsa-ard

2006-01-18T23:59:59.000Z

438

Matching the quark model to the 1/N{sub c} expansion  

Science Conference Proceedings (OSTI)

We compute the coefficients of the effective mass operator of the 1/N{sub c} expansion for negative parity L = 1 excited baryons using the Isgur-Karl model in order to compare the general approach, where the coefficients are obtained by fitting to data, with a specific constituent quark model calculation. We discuss the physics behind the fitted coefficients for the scalar part of the most general two-body quark-quark interaction. We find that both pion exchange and gluon exchange lead to the dominance of the same operator at the level of the effective mass operator, which is also observed from data.

Pirjol, Dan [National Institute for Physics and Nuclear Engineering, Department of Particle Physics, 077125 Bucharest (Romania); Schat, Carlos [Department of Physics and Astronomy, Ohio University, Athens, Ohio 45701 (United States) and Departamento de Fisica, FCEyN, Universidad de Buenos Aires, Ciudad Universitaria, Pab.1, (1428) Buenos Aires (Argentina)

2011-10-24T23:59:59.000Z

439

Jet-Tagged Back-Scattering Photons For Quark Gluon Plasma Tomography  

E-Print Network (OSTI)

Direct photons are important probes for quark gluon plasma created in high energy nuclear collisions. Various sources of direct photons in nuclear collisions are known, each of them endowed with characteristic information about the production process. However, it has been challenging to separate direct photon sources through measurements of single inclusive photon spectra and photon azimuthal asymmetry. Here we explore a method to identify photons created from the back-scattering of high momentum quarks off quark gluon plasma. We show that the correlation of back-scattering photons with a trigger jet leads to a signal that should be measurable at RHIC and LHC.

Rainer J. Fries; Somnath De; Dinesh K. Srivastava

2012-11-05T23:59:59.000Z

440

Unconventional fermions: The Price of Quark-Lepton Unification at TeV Scales  

E-Print Network (OSTI)

The early petite unification (PUT) of quarks and leptons at TeV scales with sin^2 theta_W(M^2_Z) used as a constraint, necessitates the introduction of extra quarks and leptons with unconventional electric charges (up to 4/3 for the quarks and 2 for the leptons). This talk, in honor of Paul Frampton's 60th birthday, will be devoted to the motivation and construction of models of early unification and to their implications, including the issues of rare decays and unconventional fermions.

P. Q. Hung

2004-06-23T23:59:59.000Z

Note: This page contains sample records for the topic "quarks und leptonen" 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

Stability window and mass-radius relation for magnetized strange quark stars  

E-Print Network (OSTI)

The stability of magnetized strange quark matter (MSQM) is investigated within the phenomenological MIT bag model, taking into account the variation of the relevant input parameters, namely, the strange quark mass, baryon density, magnetic field and bag parameter. We obtain that the energy per baryon decreases as the magnetic field increases, and its minimum value at vanishing pressure is lower than the value found for SQM. This implies that MSQM is more stable than non-magnetized SQM. Furthermore, the stability window of MSQM is found to be wider than the corresponding one of SQM. The mass-radius relation for magnetized strange quark stars is also derived in this framework.

R. Gonzalez Felipe; A. Perez Martinez

2008-12-01T23:59:59.000Z

442

Heavy Quark Physics in Nf = 2 QCD ? CP-PACS Collaboration:  

E-Print Network (OSTI)

We present a preliminary analysis of the heavy-heavy spectrum and heavy-light decay constants in full QCD, using a tadpole-improved SW quark action and an RG-improved gauge action on a 16 3 32 lattice with four sea quark masses corresponding to m?/m? ? 0.8, 0.75, 0.7, 0.6 and a ?1 ? 1.3 GeV. We focus particularly on the effect of sea quarks on these observables. 1.

unknown authors

1998-01-01T23:59:59.000Z

443

Search for heavy vector-like quarks coupling to light quarks in proton-proton collisions at root s=7 TeV with the ATLAS detector  

Science Conference Proceedings (OSTI)

This Letter presents a search for singly produced vector-like quarks, Q, coupling to light quarks, q. The search is sensitive to both charged current (CC) and neutral current (NC) processes, pp {yields} Qq {yields} Wqq{prime} and pp {yields} Qq {yields} Zqq{prime} with a leptonic decay of the vector gauge boson. In 1.04 fb{sup -1} of data taken in 2011 by the ATLAS experiment at a center-of-mass energy {radical}s = 7 TeV, no evidence of such heavy vector-like quarks is observed above the expected Standard Model background. Limits on the heavy vector-like quark production cross section times branching ratio as a function of mass m{sub Q} are obtained. For a coupling {kappa}{sub qQ} = v/m{sub Q}, where v is the Higgs vacuum expectation value, 95% C.L. lower limits on the mass of a vector-like quark are set at 900 GeV and 760 GeV from CC and NC processes, respectively.

Aad G.; Abbott, B.; Abdallah, J.; Khalek, S. Abdel; Abdelalim, A. A.; Abdesselam, A.; Abdinov, O.; Abi, B.; Abolins, M.; AbouZeid, O. S. s; Abramowicz, H.; Abreu, H.; Acerbi, E.; Acharya, B. S.; Adamczyk, L.; Adams, D. L.; Addy, T. N.; Adelman, J.; et al.

2012-05-30T23:59:59.000Z

444

Higgs boson decay into heavy quarks and heavy leptons: higher order corrections  

E-Print Network (OSTI)

Theoretical predictions for the decay width of Standard Model Higgs boson into bottom quarks and tau-leptons, in the case when M_HHiggs boson into bb and tau+tau- are discussed.

Kim, Victor T

2010-01-01T23:59:59.000Z

445

Search for neutral Higgs bosons in events with multiple bottom quarks at the Tevatron  

E-Print Network (OSTI)

The combination of searches performed by the CDF and D0 collaborations at the Fermilab Tevatron Collider for neutral Higgs bosons produced in association with b quarks is reported. The data, corresponding to 2.6??fb[superscript ...

Gomez-Ceballos, Guillelmo

446

On the origin of families of quarks and leptons - predictions for four families  

E-Print Network (OSTI)

The approach unifying all the internal degrees of freedom--proposed by one of us--is offering a new way of understanding families of quarks and leptons: A part of the starting Lagrange density in d(=1+13), which includes two kinds of spin connection fields--the gauge fields of two types of Clifford algebra objects--transforms the right handed quarks and leptons into the left handed ones manifesting in d=1+3 the Yukawa couplings of the Standard model. We study the influence of the way of breaking symmetries on the Yukawa couplings and estimate properties of the fourth family--the quark masses and the mixing matrix, investigating the possibility that the fourth family of quarks and leptons appears at low enough energies to be observable with the new generation of accelerators.

G. Bregar; M. Breskvar; D. Lukman; N. S. Mankoc Borstnik

2007-08-21T23:59:59.000Z

447

Impact of Strange Quark Matter Nuggets on Pycnonuclear Reaction Rates in the Crusts of Neutron Stars  

E-Print Network (OSTI)

This paper presents an investigation into the pycnonuclear reaction rates in dense crustal matter of neutron stars contaminated with strange quark matter nuggets. The presence of such nuggets in the crustal matter of neutron stars would be a natural consequence if Witten's strange quark matter hypothesis is correct. The methodology presented in this paper is a recreation of a recent representation of nuclear force interactions embedded within pycnonuclear reaction processes. The study then extends the methodology to incorporate distinctive theoretical characteristics of strange quark matter nuggets, like their low charge-per-baryon ratio, and then assesses their effects on the pycnonuclear reaction rates. Particular emphasis is put on the impact of color superconductivity on the reaction rates. Depending on whether or not quark nuggets are in this novel state of matter, their electric charge properties vary drastically which turns out to have a dramatic effect on the pycnonuclear reaction rates. Future nuclea...

Golf, Barbara; Weber, Fridolin

2009-01-01T23:59:59.000Z

448

Composition and stability of hybrid stars with hyperons and quark color-superconductivity  

E-Print Network (OSTI)

The recent measurement of 1.97 solar mass pulsar places a stringent lower bound on the maximum mass of compact stars and thus challenges the existence of any agents which soften the equation of state of ultra-dense matter. We address the question whether hyperons and/or quark matter can be accommodated in massive compact stars by constructing an equation of state based on a combination of phenomenological relativistic hyper-nuclear density functional and an effective model of QCD (the Nambu-Jona-Lasinio model). Stable configurations are obtained with M < 1.97M_{\\sun} featuring hyper-nuclear and quark matter in color superconducting state if the equation of state of nuclear matter is stiff above the saturation density, the transition to quark matter takes place at a few times the nuclear saturation density, and the repulsive vector interactions in quark matter are substantial.

Bonanno, Luca

2011-01-01T23:59:59.000Z

449

Constraining a fourth generation of quarks: non-perturbative Higgs boson mass bounds  

E-Print Network (OSTI)

We present a non-perturbative determination of the upper and lower Higgs boson mass bounds with a heavy fourth generation of quarks from numerical lattice computations in a chirally symmetric Higgs-Yukawa model. We find that the upper bound only moderately rises with the quark mass while the lower bound increases significantly, providing additional constraints on the existence of a straight-forward fourth quark generation. We examine the stability of the lower bound under the addition of a higher dimensional operator to the scalar field potential using perturbation theory, demonstrating that it is not significantly altered for small values of the coupling of this operator. For a Higgs boson mass of $\\sim125\\mathrm{GeV}$ we find that the maximum value of the fourth generation quark mass is $\\sim300\\mathrm{GeV}$, which is already in conflict with bounds from direct searches.

John Bulava; Karl Jansen; Attila Nagy

2013-01-15T23:59:59.000Z

450

BNL-71205-2003-CP THE TOP QUARK, QCD, AND NEW PHYSICS S  

NLE Websites -- All DOE Office Websites (Extended Search)

top quark mass are discussed in detail. The associated production of a tE pair and a Higgs boson in either e+e- or hadronic collisions is presented at next-to-leading-order QCD and...

451

Radiation of a circulating quark in strongly coupled N = 4 super Yang-Mills theory  

E-Print Network (OSTI)

The energy density and angular distribution of power radiated by a quark undergoing circular motion in strongly coupled N? = ?4 supersymmetric Yang?Mills (SYM) theory is computed using gauge?gravity duality. The results ...

Athanasiou, Christiana

452

Helicity probabilities for heavy quark fragmentation into heavy-light excited mesons  

E-Print Network (OSTI)

After a brief review on how heavy quark symmetry constraints the helicity fragmentation probabilities for a heavy quark hadronizes into heavy-light hadrons, we present a heavy quark fragmentation model to extract the value for the Falk-Peskin probability $w_{3/2}$ describing the fragmentation of a heavy quark into a heavy-light meson whose light degrees of freedom have angular momentum ${3 \\over 2}$. We point out that this probability depends on the longitudinal momentum fraction $z$ of the meson and on its transverse momentum $p_\\bot$ relative to the jet axis. In this model, the light degrees of freedom prefer to have their angular momentum aligned transverse to, rather than along, the jet axis. Implications for the production of excited heavy mesons, like $D^{**}$ and $B^{**}$, are briefly discussed.

Tzu Chiang Yuan

1995-03-08T23:59:59.000Z

453

Yukawaon Model with Anomaly Free Set of Quarks and Leptons in a U(3) Family Symmetry  

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. So far, yukawaons $Y_f$ have been assigned to ${\\bf 6}$ or ${\\bf 6}^*$ of U(3) family symmetry, so that quarks and leptons were not anomaly free in U(3). In this paper, yukawaons are assigned to ${\\bf 8}+{\\bf 1}$ of U(3), so that quarks and leptons are anomaly free. Since VEV relations among yukawaons are also considerably changed, parameter fitting of the model is renewed. After fixing our free parameters by observed mass ratios, we have only two and one remaining free parameters for quark and lepton mixings, respectively. We obtain successful predictions for the quark and lepton mixing parameters including magnitudes of $CP$ violation. The effective Majorana neutrino mass is also predicted.

Yoshio Koide; Hiroyuki Nishiura

2013-08-09T23:59:59.000Z

454

Simulation of measuring bottom quark flow in heavy ion collisions using the CMS detector  

E-Print Network (OSTI)

In this thesis, I carried out a simulation study to characterize the measurement of bottom quark flow in relativistic Pb+Pb collisions using the Compact Muon Solenoid experiment. The Hydjet event generator is used to produce ...

Franke, Arthur James

2007-01-01T23:59:59.000Z

455

Baryons and baryonic matter in the large Nc and heavy quark limits  

E-Print Network (OSTI)

This paper explores properties of baryons and finite density baryonic matter in an artificial world in which N[subscript c], the number of colors, is large and the quarks of all species are degenerate and much larger than ...

Cohen, Thomas D.

456

Parton distribution function for quarks in an s-channel approach  

E-Print Network (OSTI)

We use an s-channel picture of hard hadronic collisions to investigate the parton distribution function for quarks at small momentum fraction x, which corresponds to very high energy scattering. We study the renormalized quark distribution at one loop in this approach. In the high-energy picture, the quark distribution function is expressed in terms of a Wilson-line correlator that represents the cross section for a color dipole to scatter from the proton. We model this Wilson-line correlator in a saturation model. We relate this representation of the quark distribution function to the corresponding representation of the structure function F_T(x,Q^2) for deeply inelastic scattering.

F. Hautmann; D. E. Soper

2007-02-07T23:59:59.000Z

457

Phase diagram of dense quark matter in QCD-like theories  

Science Conference Proceedings (OSTI)

I report the results of a series of works on the phase diagram of theories with a different number of colors and/or quarks in a different representation than in QCD. Similarities as well as differences as compared to the real world are pointed out, focusing in particular on the interplay of confinement and chiral symmetry breaking. It will be argued that recent lattice data may provide us with a clue to understand deconfinement in cold dense quark matter.

Brauner, Tomas [Faculty of Physics, University of Bielefeld, D-33501 Bielefeld (Germany); Department of Theoretical Physics, Nuclear Physics Institute ASCR, CZ-25068 Rez (Czech Republic)

2011-05-23T23:59:59.000Z

458

Non-perturbative effects for the Quark-Gluon Plasma equation of state  

Science Conference Proceedings (OSTI)

The non-perturbative effects for the Quark-Gluon Plasma (QGP) equation of state (EoS) are considered. The modifications of the bag model EoS are constructed to satisfy the main qualitative features observed for the QGP EoS in the lattice QCD calculations. A quantitative comparison with the lattice results is done for the SU(3) gluon plasma and for the QGP with dynamical quarks. Our analysis advocates a negative value of the bag constant B.

Begun, V. V., E-mail: viktor.begun@gmail.com; Gorenstein, M. I., E-mail: goren@bitp.kiev.ua; Mogilevsky, O. A. [Bogolyubov Institute for Theoretical Physics (Ukraine)

2012-07-15T23:59:59.000Z

459

Quark helicity flip generalized parton distributions from two-flavor lattice QCD  

E-Print Network (OSTI)

We present an initiatory study of quark helicity flip generalized parton distributions (GPDs) in n_f=2 lattice QCD, based on clover-improved Wilson fermions for a large number of coupling constants and pion masses. Quark helicity flip GPDs yield essential information on the transverse spin structure of the nucleon. In this work, we show first results on their lowest moments and dipole masses and study the corresponding chiral and continuum extrapolations.

M. Gockeler; Ph. Hagler; R. Horsley; D. Pleiter; P. E. L. Rakow; A. Schafer; G. Schierholz; J. M. Zanotti

2005-07-01T23:59:59.000Z

460

Probing gluon nuclear PDF with direct photon production in association with a heavy quark  

E-Print Network (OSTI)

We investigate a possible use of direct photon production in association with a heavy quark in $pA$ collisions at the large hadron collider to constrain the nuclear gluon parton distribution function. This process is sensitive to both, the nuclear heavy quark and gluon parton distribution functions and is a very promising candidate to help determine the gluon nuclear PDF which is still largely untested.

K. Kovarik; T. Stavreva

2011-07-15T23:59:59.000Z

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461

Challenges to quantum chromodynamics: Anomalous spin, heavy quark, and nuclear phenomena  

SciTech Connect

The general structure of QCD meshes remarkably well with the facts of the hadronic world, especially quark-based spectroscopy, current algebra, the approximate point-like structure of large momentum transfer inclusive reactions, and the logarithmic violation of scale invariance in deep inelastic lepton-hadron reactions. QCD has been successful in predicting the features of electron-positron and photon-photon annihilation into hadrons, including the magnitude and scaling of the cross sections, the shape of the photon structure function, the production of hadronic jets with patterns conforming to elementary quark and gluon subprocesses. The experimental measurements appear to be consistent with basic postulates of QCD, that the charge and weak currents within hadrons are carried by fractionally-charged quarks, and that the strength of the interactions between the quarks, and gluons becomes weak at short distances, consistent with asymptotic freedom. Nevertheless in some cases, the predictions of QCD appear to be in dramatic conflict with experiment. The anomalies suggest that the proton itself as a much more complex object than suggested by simple non-relativistic quark models. Recent analyses of the proton distribution amplitude using QCD sum rules points to highly-nontrival proton structure. Solutions to QCD in one-space and one-time dimension suggest that the momentum distributions of non-valence quarks in the hadrons have a non-trival oscillatory structure. The data seems also to be suggesting that the intrinsic'' bound state structure of the proton has a non- negligible strange and charm quark content, in addition to the extrinsic'' sources of heavy quarks created in the collision itself. 144 refs., 46 figs., 2 tabs.

Brodsky, S.J.

1989-11-01T23:59:59.000Z

462

An estimate of heavy quark momentum diffusion coefficient in gluon plasma  

E-Print Network (OSTI)

We calculate the momentum diffusion coefficient for heavy quarks in SU(3) gluon plasma at temperatures 1-2 times the deconfinement temperature. The momentum diffusion coefficient is extracted from a Monte Carlo calculation of the correlation function of color electric fields, in the leading order of expansion in heavy quark mass. Systematics of the calculation are examined, and compared with perturbtion theory and other estimates.

Debasish Banerjee; Saumen Datta; Rajiv V. Gavai; Pushan Majumdar

2012-11-11T23:59:59.000Z

463

Progress in Understanding the Nuclear Equation of State at the Quark Level  

SciTech Connect

At the present time there is a lively debate within the nuclear community concerning the relevance of quark degrees of freedom in understanding nuclear structure. We outline the key issues and review the impressive progress made recently within the framework of the quark-meson coupling model. In particular, we explain in quite general terms how the modification of the internal structure of hadrons in-medium leads naturally to three- and four-body forces, or equivalently, to density dependent effective interactions.

A.W. Thomas; P.A.M. Guichon

2007-01-03T23:59:59.000Z

464

Exotic mesons from quantum chromodynamics with improved gluon and quark actions on the anisotropic lattice  

E-Print Network (OSTI)

Hybrid (exotic) mesons, which are important predictions of quantum chromodynamics (QCD), are states of quarks and anti-quarks bound by excited gluons. First principle lattice study of such states would help us understand the role of ``dynamical'' color in low energy QCD and provide valuable information for experimental search for these new particles. In this paper, we apply both improved gluon and quark actions to the hybrid mesons, which might be more efficient than the previous works in reducing lattice spacing error and finite volume effect. Quenched simulations were done at $\\beta=2.6$ and on a $\\xi=3$ anisotropic $12^3 \\times 36$ lattice using our PC cluster. We obtain $2013 \\pm 26 \\pm 71$ MeV for the mass of the $1^{-+}$ hybrid meson ${\\bar q}qg$ in the light quark sector, and $4369 \\pm 37 \\pm 99$Mev in the charm quark sector; the mass splitting between the $1^{-+}$ hybrid meson ${\\bar c}c g$ in the charm quark sector and the spin averaged S-wave charmonium mass is estimated to be $1302 \\pm 37 \\pm 99$ M...

Mei, Z H; Mei, Zhong-Hao; Luo, Xiang-Qian

2003-01-01T23:59:59.000Z

465

A Direct Measurement of the Total Decay Width of the Top Quark  

E-Print Network (OSTI)

We present a measurement of the total decay width of the top quark using events with top-antitop-quark pair candidates reconstructed in the final state with one charged lepton and four or more hadronic jets. We use the full Tevatron Run II data set of $\\sqrt{s} = 1.96$ TeV proton-antiproton collisions recorded by the CDF II detector. The top-quark mass and the mass of the hadronically-decaying $W$ boson are reconstructed for each event and compared with distributions derived from simulated signal and background samples to extract the top-quark width (\\gmt) and the energy scale of the calorimeter jets with {\\it in-situ} calibration. For a top-quark mass $\\mtop = \\gevcc{172.5}$, we find $1.10<\\gmt<\\gev{4.05}$ at 68% confidence level, which is in agreement with the standard-model expectation of \\gev{1.3} and is the most precise direct measurement of the top-quark width to date.

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

2013-08-19T23:59:59.000Z

466

Effects of color superconductivity on the nucleation of quark matter in neutron stars  

E-Print Network (OSTI)

We study the nucleation of quark matter drops at the center of cold deleptonized neutron stars. This is relevant in the determination of the critical mass $M_{cr}$ of hadronic stars above which it is possible a transition to a quark star (strange or hybrid). We investigate the dependence of $M_{cr}$ upon the parameters of the quark model (the Bag constant $B$, the pairing gap $\\Delta$, and the surface tension $\\sigma$ of the quark-hadron interphase) and for different parametrization of the hadronic equations of state. The dependence of $M_{cr}$ on $B$, $\\Delta$ and $\\sigma$ is mild if the parameters of the quark model correspond to hybrid stars, and strong if they correspond to strange stars. For a large part of the parameter space corresponding to hybrid stars, the critical mass is very close (but smaller than) the maximum mass of hadronic stars, and therefore compatible with a "mixed" population of compact stars (pure hadronic up to the critical mass and hybrid above the critical mass). For very large $B$ the critical mass is never smaller than the maximum mass of hadronic stars, implying that quark stars cannot form through the here studied mechanism. The energy released in the conversion is $3 \\times 10^{52}$ erg - $4 \\times 10^{53}$ erg, i.e. sufficient to power a gamma ray burst.

I. Bombaci; G. Lugones; I. Vidana

2006-03-23T23:59:59.000Z

467

Thera als Angelpunkt der aegyptischen und isrealitischen Chronologien  

E-Print Network (OSTI)

The Exodus was causally connected to the eruption of Thera. The time of this geological event is determined by C14 dating as 1627-1600 BC. The chaos that followed this catastrophe led to upheavals which distorted the chronologies. Taking periods of foreign domination into account leads to an agreement between the chronologies of Egypt and Israel. ----- Der Exodus wurde durch den Ausbruch von Thera ermoeglicht, welcher als geologisches Ereignis durch C14 Datierungen auf die Zeit 1627-1600 BC festgelegt ist. Das durch die Katastrophe bewirkte Chaos fuerte zu Umwaelzungen, welche die Chronologien verzerrten. Die Beruecksichtigung der Zeiten der Fremdherrschaft fuehrt zu einer Uebereinstimmung der aegyptischen und israelischen Chronologien.

W. Woelfli

2009-09-07T23:59:59.000Z

468

Quarks, Electrons, and Atoms in Closely Related Universes  

E-Print Network (OSTI)

In a model where a multiverse wavefunction explores a multitude of vacua with different symmetries and parameters, properties of universes closely related to ours can be understood by examining the consequences of small departures of physical parameters from their observed values. The masses of the light fermions that make up the stable matter of which we are made-- the up and down quarks, and the electron-- have values in a narrow window that both allows a variety of nuclei other than protons to exist, and at the same time allows atoms with stable shells of electrons that are not devoured by their nuclei. These fundamental parameters of the Standard Model are good candidates for quantities whose values are determined through selection effects within a multiverse, since a living world of molecules needs stable nuclei other than just protons and neutrons. If the fermion masses are fixed by brane condensation or compactification of extra dimensions, there may be observable fossils of the branching event, such as a gravitational wave background.

Craig J. Hogan

2004-07-05T23:59:59.000Z

469

Non-linear waves in a Quark Gluon Plasma  

E-Print Network (OSTI)

Recent measurements at RHIC suggest that a nearly perfect fluid of quarks and gluons is produced in AA collisions. Moreover the passage of supersonic partons through this medium seems to produce waves. These waves might pile up and form Mach cones, which would manifest themselves in the so called away-side jets, forming a broad structure in the angular distribution of the particles recoiling against a trigger jet of moderate energy. In most of the theoretical descriptions of these phenomena, the hydrodynamic equations are linearized for simplicity. We propose an alternative explanation for the observed broadening of the away-side peak. It is based on hydrodynamics but it is a consequence of the non-linearities of the equations, which instead of simple waves may lead to localized waves or even solitons. We investigate in detail the consequences of including the non-linear terms. We use a simple equation of state for the QGP and expand the hydrodynamic equations around equilibrium configurations. The resulting differential equations describe the propagation of perturbations in the energy density. We solve them numerically and find that localized perturbations can propagate for long distances in the plasma. Under certain conditions our solutions mimick the propagation of Korteweg - de Vries solitons.

D. A. Fogaa; L. G. Ferreira Filho; F. S. Navarra

2009-08-28T23:59:59.000Z

470

Heavy quark production in the black hole evaporation at LHC  

SciTech Connect

The understanding of Quantum Chromodynamics (QCD) and Quantum Gravity are currently two of the main open questions in Physics. In order to understand these problems some authors proposed the existence of extra dimensions in the Nature. These extra dimensions would be compacted and not visible on the macroscopic world, but the effects would be manifest in ultrarelativistic colision process. In particular, black holes (BH) could be produced in proton-proton colisions in the Large Hadron Collider (LHC) and in future colliders. The BH is an object characterized by its mass and temperature wich also characterizes the evaporation process. All kind of particle should be produced in this process. Our goal in this contribution is to study the BH production in proton - proton collisions at LHC and its evaporation rate in heavy quarks. We present our estimate considering two scenarios (with and without trapped energy corrections) and compare our predictions with those obtained using perturbative QCD. Our results demonstrate that in both scenarios the charm and bottom production in the BH evaporation are smaller than the QCD prediction at LHC. In contrast, the top production is similar or larger than the QCD prediction, if the trapped energy corrections are disregarded.

Thiel, M.; Goncalves, V. P.; Sauter, W. K. [Instituto de Fisica e Matematica, Universidade Federal de Pelotas (Brazil)

2013-03-25T23:59:59.000Z

471

HAPPEX: Strange Quarks in the Proton and He4  

DOE Green Energy (OSTI)

HAPPEX results from our 2005 run for the parity-violating asymmetry A{sub PV} in elastic scattering of 3 GeV electrons off hydrogen and {sup 4}He targets at ({theta}{sub lab}) {approx} 6.0{sup o} are presented. The {sup 4}He result is A{sub PV} = (+6.40 {+-} 0.23 (stat) {+-} 0.12 (syst)) x 10{sup -6}. The hydrogen result is A{sub PV} = (-1.58 {+-} 0.12 (stat) {+-} 0.04 (syst)) x 10{sup -6}. The asymmetry for hydrogen is a linear combination of G{sub E}{sup s} and G{sub M}{sup s}, the strange quark contributions to the electric and magnetic form factors of the nucleon, respectively, and that for {sup 4}He is a function of G{sub E}{sup s} alone. The measurements imply G{sub E}{sup s} + 0.09 G{sub M}{sup s} = 0.007 {+-} 0.011 {+-} 0.006 at = 0.109 GeV{sup 2} and G{sub E}{sup s} = 0.002 {+-} 0.014 {+-} 0.007 at = 0.077GeV{sup 2}.

Robert Michaels

2006-10-02T23:59:59.000Z

472

Observation of Electroweak Single Top-Quark Production with the CDF II Experiment  

SciTech Connect

The standard model of elementary particle physics (SM) predicts, besides the top-quark pair production via the strong interaction, also the electroweak production of single top-quarks [19]. Up to now, the Fermilab Tevatron proton-antiproton-collider is the only place to produce and study top quarks emerging from hadron-hadron-collisions. Top quarks were directly observed in 1995 during the Tevatron Run I at a center-of-mass energy of {radical}s = 1.8 TeV simultaneously by the CDF and D0 Collaborations via the strong production of top-quark pairs. Run II of the Tevatron data taking period started 2001 at {radical}s = 1.96 TeV after a five year upgrade of the Tevatron accelerator complex and of both experiments. One main component of its physics program is the determination of the properties of the top quark including its electroweak production. Even though Run II is still ongoing, the study of the top quark is already a successful endeavor, confirmed by dozens of publications from both Tevatron experiments. A comprehensive review of top-quark physics can be found in reference. The reasons for searching for single top-quark production are compelling. As the electroweak top-quark production proceeds via a Wtb vertex, it provides the unique opportunity of the direct measurement of the CKM matrix element |V{sub tb}|, which is expected to be |V{sub tb}| {approx} 1 in the SM. Significant deviations from unity could be an indication of a fourth quark generation, a production mode via flavor-changing neutral currents, and other new phenomena, respectively. There are two dominating electroweak top-quark production modes at the Fermilab Tevatron: the t-channel exchange of a virtual W boson striking a b quark and the s-channel production of a timelike W boson via the fusion of two quarks. In proton-antiproton-collisions the third electroweak production mode, the associated Wt production of an on-shell W boson in conjunction with a top quark has a comparatively negligible small predicted cross section. Therefore, the vast majority of the CDF and D0 single top-quark analyses search for the combined s- and t-channel signal, with the production ratio to be given by the SM. In Tevatron Run I, several limits on the single top-quark production cross section were set by CDF and D0, whereas in Run II, even stronger limits followed by both collaborations. Furthermore, limits on the non-SM production of single top-quarks via flavor-changing neutral currents could be obtained. The electroweak production of single top-quarks has not yet been observed up to the time of this thesis, although the D0 and shortly thereafter the CDF Collaborations found first evidence. The experimental challenge of the search for single top-quark production is the tiny expected signal beneath a large and imprecisely known amount of background processes. The relative fraction of background events is at the order of about ten times higher compared to the top-quark pair production. Consequently, the expected signal amounts to about 5% of the full candidate event sample whose background contribution is only known to a level at the order of 20%. Furthermore, the signal events themselves are expected to be not as distinct from the background as the top-quark pair production since there is only one heavy object present in the event. Thus, experimental methods like simple counting experiments are not sufficiently sensitive and the development of more sophisticated analysis techniques is required to distinguish such small signals from alike and inaccurately known background processes. Neural networks comply with those requirements. They can be used to distinguish between signal and background processes by combining the information contained in several variables into a powerful discriminant, while each variable has a rather low separation capability. The application of those neural network discriminants to collision data provide a method for the extraction of the signal fraction and its significance. This thesis presents a neural network search for combined as well as separate

Lueck, Jan; /KARLSRUHE U., EKP

2009-07-01T23:59:59.000Z

473

Observation of Electroweak Single Top-Quark Production with the CDF II Experiment  

Science Conference Proceedings (OSTI)

The standard model of elementary particle physics (SM) predicts, besides the top-quark pair production via the strong interaction, also the electroweak production of single top-quarks [19]. Up to now, the Fermilab Tevatron proton-antiproton-collider is the only place to produce and study top quarks emerging from hadron-hadron-collisions. Top quarks were directly observed in 1995 during the Tevatron Run I at a center-of-mass energy of {radical}s = 1.8 TeV simultaneously by the CDF and D0 Collaborations via the strong production of top-quark pairs. Run II of the Tevatron data taking period started 2001 at {radical}s = 1.96 TeV after a five year upgrade of the Tevatron accelerator complex and of both experiments. One main component of its physics program is the determination of the properties of the top quark including its electroweak production. Even though Run II is still ongoing, the study of the top quark is already a successful endeavor, confirmed by dozens of publications from both Tevatron experiments. A comprehensive review of top-quark physics can be found in reference. The reasons for searching for single top-quark production are compelling. As the electroweak top-quark production proceeds via a Wtb vertex, it provides the unique opportunity of the direct measurement of the CKM matrix element |V{sub tb}|, which is expected to be |V{sub tb}| {approx} 1 in the SM. Significant deviations from unity could be an indication of a fourth quark generation, a production mode via flavor-changing neutral currents, and other new phenomena, respectively. There are two dominating electroweak top-quark production modes at the Fermilab Tevatron: the t-channel exchange of a virtual W boson striking a b quark and the s-channel production of a timelike W boson via the fusion of two quarks. In proton-antiproton-collisions the third electroweak production mode, the associated Wt production of an on-shell W boson in conjunction with a top quark has a comparatively negligible small predicted cross section. Therefore, the vast majority of the CDF and D0 single top-quark analyses search for the combined s- and t-channel signal, with the production ratio to be given by the SM. In Tevatron Run I, several limits on the single top-quark production cross section were set by CDF and D0, whereas in Run II, even stronger limits followed by both collaborations. Furthermore, limits on the non-SM production of single top-quarks via flavor-changing neutral currents could be obtained. The electroweak production of single top-quarks has not yet been observed up to the time of this thesis, although the D0 and shortly thereafter the CDF Collaborations found first evidence. The experimental challenge of the search for single top-quark production is the tiny expected signal beneath a large and imprecisely known amount of background processes. The relative fraction of background events is at the order of about ten times higher compared to the top-quark pair production. Consequently, the expected signal amounts to about 5% of the full candidate event sample whose background contribution is only known to a level at the order of 20%. Furthermore, the signal events themselves are expected to be not as distinct from the background as the top-quark pair production since there is only one heavy object present in the event. Thus, experimental methods like simple counting experiments are not sufficiently sensitive and the development of more sophisticated analysis techniques is required to distinguish such small signals from alike and inaccurately known background processes. Neural networks comply with those requirements. They can be used to distinguish between signal and background processes by combining the information contained in several variables into a powerful discriminant, while each variable has a rather low separation capability. The application of those neural network discriminants to collision data provide a method for the extraction of the signal fraction and its significance. This thesis presents a neural network search for combined as well as separate

Lueck, Jan; /KARLSRUHE U., EKP

2009-07-01T23:59:59.000Z

474

Quark-mass dependence of the three-flavor QCD phase diagram at zero and imaginary chemical potential: Model prediction  

Science Conference Proceedings (OSTI)

We draw the three-flavor phase diagram as a function of light- and strange-quark masses for both zero and imaginary quark-number chemical potential, using the Polyakov-loop extended Nambu-Jona-Lasinio model with an effective four-quark vertex depending on the Polyakov loop. The model prediction is qualitatively consistent with 2+1 flavor lattice QCD prediction at zero chemical potential and with degenerate three-flavor lattice QCD prediction at imaginary chemical potential.

Sasaki, Takahiro; Sakai, Yuji; Yahiro, Masanobu [Department of Physics, Graduate School of Sciences, Kyushu University, Fukuoka 812-8581 (Japan); Kouno, Hiroaki [Department of Physics, Saga University, Saga 840-8502 (Japan)

2011-11-01T23:59:59.000Z

475

Measurement of the top-quark pair production cross-section in events with two leptons and bottom-quark jets using the full CDF data set  

E-Print Network (OSTI)

We present a measurement of the top-quark pair production cross-section in proton-antiproton collisions at $\\sqrt{s}$=1.96 TeV. The data were collected at the Fermilab Tevatron by the CDF II detector and correspond to an integrated luminosity of 8.8 fb$^{-1}$, representing the complete CDF Run II data set. We select events consistent with the production of top-quark pairs by requiring the presence of two reconstructed leptons, an imbalance in the total event transverse momentum, and jets. At least one jet is required to be identified as consistent with the fragmentation of a bottom quark using a secondary-vertex-finding algorithm. The 246 candidate events are estimated to have a signal purity of 91%. We measure a cross section of $\\sigma_{\\ttbar}$ = 7.09 $\\pm$ 0.84 pb, assuming a top-quark mass of 172.5 GeV/$c^{2}$. The results are consistent with the standard model as predicted by next-to-leading-order calculations.

CDF Collaboration

2013-04-30T23:59:59.000Z

476

Electroweak production of the top quark in the Run II of the D0 experiment  

SciTech Connect

The work exposed in this thesis deals with the search for electroweak production of top quark (single top) in proton-antiproton collisions at {radical}s = 1.96 TeV. This production mode has not been observed yet. Analyzed data have been collected during the Run II of the D0 experiment at the Fermilab Tevatron collider. These data correspond to an integrated luminosity of 370 pb{sup -1}. In the Standard Model, the decay of a top quark always produce a high momentum bottom quark. Therefore bottom quark jets identification plays a major role in this analysis. The large lifetime of b hadrons and the subsequent large impact parameters relative to the interaction vertex of charged particle tracks are used to tag bottom quark jets. Impact parameters of tracks attached to a jet are converted into the probability for the jet to originate from the primary vertex. This algorithm has a 45% tagging efficiency for a 0.5% mistag rate. Two processes (s and t channels) dominate single top production with slightly different final states. The searched signature consists in 2 to 4 jets with at least one bottom quark jet, one charged lepton (electron or muon) and missing energy accounting for a neutrino. This final state is background dominated and multivariate techniques are needed to separate the signal from the two main backgrounds: associated production of a W boson and jets and top quarks pair production. The achieved sensitivity is not enough to reach observation and we computed upper limits at the 95% confidence level at 5 pb (s-channel) and 4.3 pb (t-channel) on single top production cross-sections.

Clement, Benoit; /Strasbourg, IReS

2006-04-01T23:59:59.000Z

477

A General Effective Action for Quark Matter and its Application to Color Superconductivity  

E-Print Network (OSTI)

I derive a general effective theory for hot and/or dense quark matter. After introducing general projection operators for hard and soft quark and gluon degrees of freedom, I explicitly compute the functional integral for the hard quark and gluon modes in the QCD partition function. Upon appropriate choices for the projection operators one recovers various well-known effective theories such as the Hard Thermal Loop/ Hard Dense Loop Effective Theories as well as the High Density Effective Theory by Hong and Schaefer. I then apply the effective theory to cold and dense quark matter and show how it can be utilized to simplify the weak-coupling solution of the color-superconducting gap equation. In general, one considers as relevant quark degrees of freedom those within a thin layer of width 2 Lambda_q around the Fermi surface and as relevant gluon degrees of freedom those with 3-momenta less than Lambda_gl. It turns out that it is necessary to choose Lambda_q << Lambda_gl, i.e., scattering of quarks along the Fermi surface is the dominant process. Moreover, this special choice of the two cutoff parameters Lambda_q and Lambda_gl facilitates the power-counting of the numerous contributions in the gap-equation. In addition, it is demonstrated that both the energy and the momentum dependence of the gap function has to be treated self-consistently in order to determine the imaginary part of the gap function. For quarks close to the Fermi surface the imaginary part is calculated explicitly and shown to be of sub-subleading order in the gap equation.

Philipp T. Reuter

2006-02-13T23:59:59.000Z

478

Next-to-next-to-leading-order collinear and soft gluon corrections for t-channel single top quark production  

SciTech Connect

I present the resummation of collinear and soft-gluon corrections to single top quark production in the t channel at next-to-next-to-leading logarithm accuracy using two-loop soft anomalous dimensions. The expansion of the resummed cross section yields approximate next-to-next-to-leading-order cross sections. Numerical results for t-channel single top quark (or single antitop) production at the Tevatron and the LHC are presented, including the dependence of the cross sections on the top quark mass and the uncertainties from scale variation and parton distributions. Combined results for all single top quark production channels are also given.

Kidonakis, Nikolaos [Kennesaw State University, Physics 1202, 1000 Chastain Road, Kennesaw, Georgia 30144-5591 (United States)

2011-05-01T23:59:59.000Z

479

Thermodynamics with density and temperature dependent particle masses and properties of bulk strange quark matter and strangelets  

E-Print Network (OSTI)

Thermodynamic formulas for investigating systems with density and/or temperature dependent particle masses are generally derived from the fundamental derivation equality of thermodynamics. Various problems in the previous treatments are discussed and modified. Properties of strange quark matter in bulk and strangelets at both zero and finite temperature are then calculated based on the new thermodynamic formulas with a new quark mass scaling, which indicates that low mass strangelets near beta equilibrium are multi-quark states with an anti-strange quark, such as the pentaquark (u^2d^2\\bar{s}) for baryon nmber 1 and the octaquark (u^4d^3\\bar{s}) for dibaryon etc.

X. J. Wen; X. H. Zhong; G. X. Peng; P. N. Shen; P. Z. Ning

2005-06-06T23:59:59.000Z

480

Erste Satzung zur nderung der Studien-und Prfungsordnung der Universitt Stuttgart fr den Bachelorstudiengang Chemie  

E-Print Network (OSTI)

Bachelorstudiengang Chemie Vom 18. August 2009 Aufgrund von § 34 Abs. 1 Satz 3 des Landeshochschulgesetzes vom 01 Satzung zur ?nderung der Studien- und Prüfungsordnung für den Bachelorstudiengang Chemie vom 01. Oktober

Möbius, Bernd

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481

Aktivierung und Desensibilsierung des olfaktorischen cAMP-gesteuerten-Kanal : Identifizerung von funktionellen Modulen.  

E-Print Network (OSTI)

??Der olfaktorische zyklisch-Nukleotid-gesteuerte Kanal (CNG-Kanal) wandelt in den Riechneuronen das chemische Duftstoffsignal in ein elektrisches Signal um und spielt somit eine wichtige Rolle bei der (more)

Prinz zu Waldeck, Clemens

2009-01-01T23:59:59.000Z

482

Fats and Oils Handbook (Nahrungsfette und le)Chapter 1 The Importance of Fats  

Science Conference Proceedings (OSTI)

Fats and Oils Handbook (Nahrungsfette und le) Chapter 1 The Importance of Fats Food Science Health Nutrition Biochemistry eChapters Food Science & Technology Health - Nutrition - Biochemistry Methods and Analyses Analytical Chemistr

483

Fats and Oils Handbook (Nahrungsfette und le)Chapter 4 Vegetable Fats and Oils  

Science Conference Proceedings (OSTI)

Fats and Oils Handbook (Nahrungsfette und le) Chapter 4 Vegetable Fats and Oils Food Science Health Nutrition Biochemistry eChapters Food Science & Technology Health - Nutrition - Biochemistry Press Downloadable pdf ...

484

Fats and Oils Handbook (Nahrungsfette und le)Chapter 6 Modification of Fats and Oils  

Science Conference Proceedings (OSTI)

Fats and Oils Handbook (Nahrungsfette und le) Chapter 6 Modification of Fats and Oils Food Science Health Nutrition Biochemistry eChapters Food Science & Technology Health - Nutrition - Biochemistry Press Downloadable

485

Fats and Oils Handbook (Nahrungsfette und le)Chapter 7 Refining  

Science Conference Proceedings (OSTI)

Fats and Oils Handbook (Nahrungsfette und le) Chapter 7 Refining Food Science Health Nutrition Biochemistry eChapters Food Science & Technology Health - Nutrition - Biochemistry Press Downloadable pdf of Chap

486

Fats and Oils Handbook (Nahrungsfette und le)Chapter 9 Analytical Methods  

Science Conference Proceedings (OSTI)

Fats and Oils Handbook (Nahrungsfette und le) Chapter 9 Analytical Methods Food Science Health Nutrition Biochemistry eChapters Food Science & Technology Health - Nutrition - Biochemistry Analytical Chemistry Methods and Analyses P

487

Fats and Oils Handbook (Nahrungsfette und le)Chapter 10 Conversion Tables and Abbreviations  

Science Conference Proceedings (OSTI)

Fats and Oils Handbook (Nahrungsfette und le) Chapter 10 Conversion Tables and Abbreviations Food Science Health Nutrition Biochemistry eChapters Food Science & Technology Health - Nutrition - Biochemistry Press Downl

488

Fats and Oils Handbook (Nahrungsfette und le)Chapter 3 Animal Fats and Oils  

Science Conference Proceedings (OSTI)

Fats and Oils Handbook (Nahrungsfette und le) Chapter 3 Animal Fats and Oils Food Science Health Nutrition Biochemistry eChapters Food Science & Technology Health - Nutrition - Biochemistry Press Downloadable pdf ...

489

Fats and Oils Handbook (Nahrungsfette und le)Chapter 5 Production of Vegetable Oils and Fats  

Science Conference Proceedings (OSTI)

Fats and Oils Handbook (Nahrungsfette und le) Chapter 5 Production of Vegetable Oils and Fats Food Science Health Nutrition Biochemistry eChapters Food Science & Technology Health - Nutrition - Biochemistry Press Down

490

Fats and Oils Handbook (Nahrungsfette und le)Chapter 8 Fat as, or in, Food  

Science Conference Proceedings (OSTI)

Fats and Oils Handbook (Nahrungsfette und le) Chapter 8 Fat as, or in, Food Food Science Health Nutrition Biochemistry eChapters Food Science & Technology Health - Nutrition - Biochemistry Press Downloadable pdf ...

491

Kommunikation und Marketing // August 2012 1 von 38 Abitur (higher education entrance qualification,  

E-Print Network (OSTI)

Investment (CSI) C Chemie chemistry Christentum und Kultur Christianity and Culture Computerlinguistik: to the living spirit) Deutsch German Deutsch als Fremdsprachenphilologie German as a foreign language Deutsch als Fremdsprachenphilologie (Literaturwissenschaft) German as a foreign language (literature) Deutsch

Heermann, Dieter W.

492

$?$ baryon strong decays in a chiral quark model  

E-Print Network (OSTI)

The strong decays of $\\Xi$ baryons up to N=2 shell were studied in a chiral quark model. The strong decay properties of these well-established ground decuplet baryons were reasonably described. We found that (i) $\\Xi(1690)$ and $\\Xi(1820)$ could be assigned to the spin-parity $J^P=1/2^-$ state $|70,^{2}{8},1,1,1/2^->$ and the spin-parity $J^P=3/2^-$ state $|70,^{2}{8},1,1,3/2^->$, respectively. Slight configuration mixing might exist in these two negative parity states. (ii) $\\Xi(1950)$ might correspond to several different $\\Xi$ resonances. The broad states ($\\Gamma\\sim 100$ MeV) observed in the $\\Xi\\pi$ channel could be classified as the pure $J^P=5/2^-$ octet state $\\Xi^0|70,^{4}8,1,1,5/2^->$ or the mixed state $|\\Xi 1/2^->_3 $ with $J^P=1/2^-$. The $\\Xi$ resonances with moderate width ($\\Gamma\\sim 60$ MeV) observed in the $\\Xi\\pi$ channel might correspond to the $J^P=1/2^+$ excitation $|56,^{4}10,2,2,1/2^+>$. The second orbital excitation $|56,^{4}10,2,2,3/2^+>$ and the mixed state $|\\Xi 1/2^->_1$ might be candidates for the narrow width state observed in the $\\Lambda \\bar{K}$ channel, however, their spin-parity numbers are incompatible with the moment analysis of the data. (iii) $\\Xi(2030)$ could not be assigned to either any spin-parity $J^P=7/2^+$ states or any pure $J^P=5/2^+$ configurations. It seems to favor the $|70,^{2}8,2,2,3/2^+>$ assignment, however, its spin conflicts with the moment analysis of the data. To find more $\\Xi$ resonances, the observations in the $\\Xi(1530)\\pi$ and $\\Sigma(1385) \\bar{K}$ channels are necessary.

Li-Ye Xiao; Xian-Hui Zhong

2013-02-01T23:59:59.000Z

493

The extraction of nuclear sea quark distribution and energy loss effect in Drell-Yan experiment  

E-Print Network (OSTI)

The next-to-leading order and leading order analysis are performed on the differential cross section ratio from Drell-Yan process. It is found that the effect of next-to-leading order corrections can be negligible on the differential cross section ratios as a function of the quark momentum fraction in the beam proton and the target nuclei for the current Fermilab and future lower beam proton energy. The nuclear Drell-Yan reaction is an ideal tool to study the energy loss of the fast quark moving through cold nuclei. In the leading order analysis, the theoretical results with quark energy loss are in good agreement with the Fermilab E866 experimental data on the Drell-Yan differential cross section ratios as a function of the momentum fraction of the target parton. It is shown that the quark energy loss effect has significant impact on the Drell-Yan differential cross section ratios. The nuclear Drell-Yan experiment at current Fermilab and future lower energy proton beam can not provide us with more information on the nuclear sea quark distribution.

Chun-Gui Duan; Na Liu; Zhan-Yuan Yan

2006-09-06T23:59:59.000Z

494

Effects of Quark Spin Flip on the Collins Fragmentation Function in a Toy Model  

E-Print Network (OSTI)

The recent extension of the NJL-jet model to hadronization of transversely polarized quarks allowed the study of the Collins fragmentation function. Both favored and unfavored Collins fragmentation functions were generated, the latter purely by multiple hadron emissions, with 1/2 moments of opposite sign in the region of the light-cone momentum fraction $z$ accessible in current experiments. Hints of such behavior has been seen in the measurements in several experiments. Also, in the transverse momentum dependent (TMD) hadron emission probabilities, modulations of up to fourth order in sine of the polar angle were observed, while the Collins effect describes just the linear modulations. A crucial part of the extended model was the calculation of the quark spin flip probability after each hadron emission in the jet. Here we study the effects of this probability on the resulting unfavored and favored Collins functions by setting it as a constant and use a toy model for the elementary single hadron emission probabilities. The results of the Monte Carlo simulations showed that preferential quark spin flip in the elementary hadron emission is needed to generate the favored and unfavored Collins functions with opposite sign 1/2 moments. For the TMD hadron emission modulations, we showed that the model quark spin flip probabilities are a partial source of the higher rode modulations, while the other source is the Collins modulation of the remnant quark from the hadron emission recoil.

Hrayr H. Matevosyan; Anthony W. Thomas; Wolfgang Bentz

2012-07-03T23:59:59.000Z

495

Impact of Strange Quark Matter Nuggets on Pycnonuclear Reaction Rates in the Crusts of Neutron Stars  

E-Print Network (OSTI)

This paper presents an investigation into the pycnonuclear reaction rates in dense crustal matter of neutron stars contaminated with strange quark matter nuggets. The presence of such nuggets in the crustal matter of neutron stars would be a natural consequence if Witten's strange quark matter hypothesis is correct. The methodology presented in this paper is a recreation of a recent representation of nuclear force interactions embedded within pycnonuclear reaction processes. The study then extends the methodology to incorporate distinctive theoretical characteristics of strange quark matter nuggets, like their low charge-per-baryon ratio, and then assesses their effects on the pycnonuclear reaction rates. Particular emphasis is put on the impact of color superconductivity on the reaction rates. Depending on whether or not quark nuggets are in this novel state of matter, their electric charge properties vary drastically which turns out to have a dramatic effect on the pycnonuclear reaction rates. Future nuclear fusion network calculations may thus have the potential to shed light on the existence of strange quark matter nuggets and on whether or not they are in a color superconducting state, as suggested by QCD.

Barbara Golf; Joe Hellmers; Fridolin Weber

2009-06-12T23:59:59.000Z

496

Gravity Dual Corrections to the Heavy Quark Potential at Finite-Temperature  

E-Print Network (OSTI)

We apply gauge/gravity duality to compute $1/N^2_c$ corrections to the heavy quark potentials of a quark--anti-quark pair ($Q\\bar Q$) and of a quark--quark pair ($QQ$) immersed into the strongly coupled N = 4 SYM plasma. On the gravity side these corrections come from the exchanges of supergravity modes between two string worldsheets stretching from the UV boundary of AdS space to the black hole horizon in the bulk and smeared over $S^5$. We find that the contributions to the $Q\\bar Q$ potential coming from the exchanges of all of the relevant modes (such as dilaton, massive scalar, 2-form field, and graviton) are all attractive, leading to an attractive net $Q\\bar Q$ pot