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Title: Top quark current experimental status


No abstract prepared.

Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
OSTI Identifier:
Report Number(s):
arXiv eprint number hep-ex/0603007; TRN: US200711%%420
DOE Contract Number:
Resource Type:
Resource Relation:
Journal Name: PoS TOP2006:007,2006; Conference: Presented at TOP 2006: International Workshop on Top Quark Physics, Coimbra, Portugal, 12-15 Jan 2006
Country of Publication:
United States

Citation Formats

Juste, Aurelio, and /Fermilab. Top quark current experimental status. United States: N. p., 2006. Web.
Juste, Aurelio, & /Fermilab. Top quark current experimental status. United States.
Juste, Aurelio, and /Fermilab. Wed . "Top quark current experimental status". United States. doi:.
title = {Top quark current experimental status},
author = {Juste, Aurelio and /Fermilab},
abstractNote = {No abstract prepared.},
doi = {},
journal = {PoS TOP2006:007,2006},
number = ,
volume = ,
place = {United States},
year = {Wed Mar 01 00:00:00 EST 2006},
month = {Wed Mar 01 00:00:00 EST 2006}

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  • This report describes the latest cross section and property measurements associated with the top quark at the Tevatron Run II. The largest data sample used is 760 pb{sup -1} of integrated luminosity. Due to its large mass, the top quark might be involved in the process of electroweak symmetry breaking, making it a useful probe for signs of new physics.
  • Possible effects from physics beyond the Standard Model have been investigated in top quark decays from a data sample enriched in t{bar t} events produced in p{bar p} collisions at {radical}s = 1.96 TeV with an integrated luminosity of approximately 700 pb{sup -1} and collected with the CDF II detector. The combined t{bar t} production cross section measurement 7.3 {+-} 0.9 pb agrees with the QCD NLO predictions: 6.7 {+-} 0.8 pb assuming m{sub top} = 175 GeV/c{sup 2}. The fraction of the V + A current in top quark decay, f{sub V+A}, is determined using the invariant mass ofmore » the charged lepton and the bottom quark jet in the decay chain t {yields} Wb {yields} {ell}{nu}b (where {ell} = e or {mu}). The measured value f{sub V+A} = - 0.06 {+-} 0.25 under the assumption m{sub top} = 175 GeV/c{sup 2} is in agreement with the Standard Model. They set an upper limit on f{sub V+A} of 0.29 at the 95% confidence level.« less
  • We examine experimental constraints on scharm-stop flavor mixing in the minimal supersymmetric standard model, which arise from the experimental bounds on squark and Higgs boson masses, the precision measurements of W-boson mass and the effective weak mixing angle, as well as the experimental data on B{sub s}-B{sub s} mixing and b{yields}s{gamma}. We find that the combined analysis can put rather stringent constraints on c-tilde{sub L}-t-tilde{sub L} and c-tilde{sub L}-t-tilde{sub R} mixings. As an illustration for the effects of such constraints, we examine various top-quark flavor-changing neutral-current processes induced by scharm-stop mixings at the LHC and find that their maximal ratesmore » are significantly lowered.« less
  • Exactly two years ago at the 1979 Lepton, Photon Symposium at Fermilab, Mary K. Gaillard presented a histogram showing the number of papers predicting a given value of toponium mass as a function of mass. I have translated this into the t-quark mass and presented it including several other bounds arising from an assortment of physical principles and arguments. These include Veltman's rho-parameter bound, a well-known bound from grand unification due to Cabibbo, Maiani, Parisi and Petronzio, and considerations of Higgs potential stability and unitarity. The central popular mechanism for generating t-quark mass predictions, you will recall, was to employmore » discrete symmetries in the Higgs sector of left-right symmetric models, leading to a central popular prediction of m approx. 15 GeV. It should be noted that discrete symmetries can lead to larger values (and smaller ones), but clearly with diminished unanimity. We should also mention independent ideas which presume a basic universal ratio of m/sup (+2/3)//m/sup (-1/3)/ for all generations and lead to a prediction of m approx. 26 GeV. In the intervening two years physicists have kept busy generating new t-quark mass predictions and Petra has pushed the lower bound up to approx. 18.5 GeV. New physical ideas have emerged which now focus more directly upon dynamical aspects of grand-unification. uv versus ir behavior of field theory, and nonlinear renormalization group equations with quasi-fixed point behavior. Some of these ideas make statements about hypothetical fourth generation fermion masses. These ideas are reviewed with an eye to statements one can make about mass scales beyond the third generation, as well.« less