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Languages : en
Pages : 4
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The top quark mass is interesting both as a fundamental parameter of the standard model as well as an important input to precision electroweak tests. The CDF Collaboration has measured the top quark mass with high precision in all decay channels with complementary methods. A combination of the results from CDF gives a top quark mass of 170.5±1.3(stat.)±1.8(syst.) GeV/c2.
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Languages : en
Pages : 4
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Book Description
The top quark mass is interesting both as a fundamental parameter of the standard model as well as an important input to precision electroweak tests. The CDF Collaboration has measured the top quark mass with high precision in all decay channels with complementary methods. A combination of the results from CDF gives a top quark mass of 170.5±1.3(stat.)±1.8(syst.) GeV/c2.
Author:
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Category :
Languages : en
Pages : 8
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Category :
Languages : en
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We present a precision measurement of the top-quark mass using the full sample of Tevatron √s = 1.96 TeV proton-antiproton collisions collected by the CDF II detector, corresponding to an integrated luminosity of 8.7 fb−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/c2.
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Languages : en
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CDF has resumed the top quark mass measurement with upgraded detectors and Tevatron complex. High statistics should allow us to determine the top mass with an uncertainty of a few GeV/c2 by the end of Run II. The current measured value, using an integrated luminosity of (almost equal to) 108 pb−1, is 177.5{sub -9.4}{sup +12.7} (stat.) " 7.1(syst.) GeV/c2 (lepton + jets with one b-jet tagged mode: the current best mode), which is consistent with RunI measurements.
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Category : Genealogy
Languages : en
Pages : 296
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Author: Kostas Kordas
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Languages : en
Pages : 7
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We report on recent measurements of the top quark mass using t{bar t} candidate events selected in {approx_equal} 320 pb{sup -1} of data from the ''Run II'' operation period of the Tevatron p{bar p} collider. More emphasis is given on the best single measurement to date (M{sub top} = 173.5{sub -3.8}{sup +3.9} GeV/c{sup 2}), provided by CDF using the ''lepton plus jets'' channel, where one W decays to a lepton-neutrino pair and the other into quarks (top quarks decay to Wb almost 100% of the time).
Author: Anyes Taffard
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Languages : en
Pages : 4
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We report on the measurements of the W boson and top-quark masses with the CDF II detector in p{bar p} collisions at {radical}s = 1.96 TeV at the Fermilab Tevatron. We highlight the major features and uncertainties for the W mass measurement. The top-quark mass measurements are presented in each t{bar t} decay channels. The combination of the most precise measurements from CDF to date leads to M{sub top} = 172.4 {+-} 1.5(stat.) {+-} 2.2(sys.) GeV/c{sup 2}, corresponding to a relative uncertainty of 1.5%.
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Category :
Languages : en
Pages :
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Author:
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Category :
Languages : en
Pages :
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We present a measurement of the top-quark mass with tt events using a data sample corresponding to an integrated luminosity of 5.7 fb -1 of pp collisions at the Fermilab Tevatron with √s = 1.96 TeV and collected by the CDF II Detector. We select events having no identified charged leptons, large missing transverse energy, and four, five, or six jets with at least one jet containing a secondary vertex consistent with the decay of a b quark. This analysis considers events from the semileptonic tt decay channel, including events that contain tau leptons, which are usually not included in the top-quark mass measurements. The measurement uses as kinematic variables the invariant mass of two jets consistent with the mass of the W boson, and the invariant masses of two different three-jet combinations. We fit the data to signal templates of varying top-quark masses and background templates, and measure a top-quark mass of Mtop = 172.3 ± 2.4 (stat) ± 1.0 (syst) GeV/c2.
Author: Christopher S. Hill
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Languages : en
Pages : 4
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The top quark, with its extraordinarily large mass (nearly that of a gold atom), plays a significant role in the phenomenology of EWSB in the Standard Model. In particular, the top quark mass when combined with the W mass constrains the mass of the as yet unobserved Higgs boson. Thus, a precise determination of the mass of the top quark is a principal goal of the CDF and D0 experiments. With the data collected thus far in Runs 1 and 2 of the Tevatron, CDF and D0 have measured the top quark mass in both the lepton+jets and dilepton decay channels using a variety of complementary experimental techniques. The author presents an overview of the most recent of the measurements.
