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Title: Progress in top quark physics

Abstract

Experimental measurements of the properties of the top quark have improved and will continue to improve significantly, with the excellent operation of the CDF and D0 experiments and the Tevatron p{bar p} collider at the Fermi National Accelerator Laboratory. All of the final state experimental signatures from top quark production and decay are being analyzed to test if this most massive quark is sensitive to new physics beyond the standard model. So far, observations are consistent with the standard model. New techniques have dramatically improved the precision of the top quark mass measurement to 1.7% and set the stage for a sub-1% measurement by 2008. This improved knowledge of the top quark mass sharpens the standard model prediction for the mass of the undiscovered Higgs boson, with implications for Higgs studies at the future LHC and ILC.

Authors:
;
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
892291
Report Number(s):
FERMILAB-CONF-05-613-E
arXiv eprint number hep-ex/0602024; TRN: US200711%%428
DOE Contract Number:
AC02-76CH03000
Resource Type:
Conference
Resource Relation:
Journal Name: AIP Conf.Proc.842:565-575,2006; Conference: To appear in the proceedings of Particles and Nuclei International Conference (PANIC 05), Santa Fe, New Mexico, 24-28 Oct 2005
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ACCURACY; DECAY; FERMILAB ACCELERATOR; FERMILAB COLLIDER DETECTOR; FERMILAB TEVATRON; FORECASTING; HIGGS BOSONS; NUCLEI; PHYSICS; PRODUCTION; QUARKS; STANDARD MODEL; T QUARKS; Experiment-HEP

Citation Formats

Thomson, Evelyn J., and /Pennsylvania U. Progress in top quark physics. United States: N. p., 2006. Web.
Thomson, Evelyn J., & /Pennsylvania U. Progress in top quark physics. United States.
Thomson, Evelyn J., and /Pennsylvania U. Wed . "Progress in top quark physics". United States. doi:. https://www.osti.gov/servlets/purl/892291.
@article{osti_892291,
title = {Progress in top quark physics},
author = {Thomson, Evelyn J. and /Pennsylvania U.},
abstractNote = {Experimental measurements of the properties of the top quark have improved and will continue to improve significantly, with the excellent operation of the CDF and D0 experiments and the Tevatron p{bar p} collider at the Fermi National Accelerator Laboratory. All of the final state experimental signatures from top quark production and decay are being analyzed to test if this most massive quark is sensitive to new physics beyond the standard model. So far, observations are consistent with the standard model. New techniques have dramatically improved the precision of the top quark mass measurement to 1.7% and set the stage for a sub-1% measurement by 2008. This improved knowledge of the top quark mass sharpens the standard model prediction for the mass of the undiscovered Higgs boson, with implications for Higgs studies at the future LHC and ILC.},
doi = {},
journal = {AIP Conf.Proc.842:565-575,2006},
number = ,
volume = ,
place = {United States},
year = {Wed Feb 01 00:00:00 EST 2006},
month = {Wed Feb 01 00:00:00 EST 2006}
}

Conference:
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  • We present the recent results on top quark physics and B physics with the Collider Detector at Fermilab (CDF). These results come from analyses using a full data sample at an integrated luminosity of 109 pb{sup -1} cross section in 1.8-TeV p{anti p} collisions. We measure the top quark mass to be 175.8{+-}6.5 GeV/c{sup 2} and the t{anti t} production cross section to be 7.6{sup +1.8}{sub -1.5} pb. We also present measurements of the lifetimes of B-hadrons and the time- dependent B{sup 0}-{anti B}{sup 0} mixing which results in the mass difference between heavy and light B{sup 0}{sub d} mesonsmore » ({Delta}m{sub d}) of 0.464{+-}0.030(stat){+-}0.026(syst) ps{sup -1}.« less
  • The authors present the recent results and future prospects on top quark physics at the Tevatron. They describe the measurements of the top quark mass and the search for single top quark production in 1.8-TeV p{bar p} collisions. The CDF and D0 combined results yield a top quark mass of 174.3 {+-} 5.1 GeV/c{sup 2}. The upper limit at 95% C.L. of the single top production cross section is found to be 16.0 pb and 15.6 pb for the W-gluon fusion process and s-channel W* process, respectively.
  • We discuss the study of the top quark at future experiments and machines. Top's large mass makes it a unique probe of physics at the natural electroweak scale. We emphasize measurements of the top quark's mass, width, and couplings, as well as searches for rare or nonstandard decays, and discuss the complementary roles played by hadron and lepton colliders.
  • The authors review the analyses of t{bar t} candidate events in various decay channels, carried out using the p{bar p} collider data at {radical}s = 1.8 TeV by the CDF and D0 collaborations at the Fermilab Tevatron. The measurements of the top quark mass (m{sub t}) using lepton+jets channel yield m{sub t} = 173.3 {+-} 7.8 GeV/c{sup 2} from D0 analysis and m{sub t} = 175.9 {+-} 6.9 GeV/c{sup 2} from CDF analysis. The production cross section is measured to be {sigma}{sub t{bar t}} = 7.6{sub -1.5}{sup +1.8} pb by CDF and {sigma}{sub t{bar t}} = 5.6 {+-} 1.8 pbmore » by D0. Further investigations using t{bar t} decays and future prospects are briefly discussed.« less
  • Most of the material presented in this report, comes from contributions to the parallel session PL20 of this conference. We summarise the experimental results of direct production of Top quarks, coming from the CDF and C0 Collaborations at Fermilab, and compare these results to what one expects within current theoretical understanding. Particular attention is given to new results such as all hadronic modes of t{bar t} decay. As far as the mass is concerned, a comparison is made with precision measurements of related quantities, coming from LEP and other experiments. An attempt is made to look at the medium-term futuremore » and understand which variables and with what accuracy one can measure them with increased integrated luminosity.« less