Measurement Of W Boson Helicity Fractions In T Anti T Decays At Dzero And Cdf
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: 2008 |
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: OCLC:727358693 |
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: 4/5 (93 Downloads) |
Synopsis Measurement of W Boson Helicity Fractions in T Anti-t Decays at DZero and CDF. by :
The properties of the W boson can be probed in top quark decays t --> bW. The CDF and DZero collaborations have released updated measurements of the W boson helicity fractions f0, f+ and f. The analysis techniques and updated measurements are discussed. This paper summarizes the talk given at the DIS2008 conference.
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: 11 |
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: 2006 |
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: OCLC:873625024 |
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: 4/5 (24 Downloads) |
Synopsis Measurement of the Helicity Fractions of W Bosons from Top Quark Decays Using Fully Reconstructed T Anti-t Events with CDF II. by :
The authors present a measurement of the fractions F0 and F+ of longitudinally polarized and right-handed W bosons in top quark decays using data collected with the CDF II detector. The data set used in the analysis corresponds to an integrated luminosity of approximately 318 pb−1. They select t{bar t} candidate events with one lepton, at least four jets, and missing transverse energy. The helicity measurement uses the decay angle [theta]*, which is defined as the angle between the momentum of the charged lepton in the W boson rest frame and the W momentum in the top quark rest frame. The cos [theta]* distribution in the data is determined by full kinematic reconstruction of the t{bar t} candidates. They find F0 = 0.85{sub -0.22}{sup +0.15}(stat)±0.06(syst) and F+ = 0.05{sub -0.05}{sup +0.11}(stat) ± 0.03(syst), which is consistent with the standard model prediction. They set an upper limit on the fraction of right-handed W bosons of F+
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: 114 |
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: 192? |
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: OCLC:24423942 |
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: 4/5 (42 Downloads) |
Synopsis Principal Statutes Affecting the Organization, Names & Functions of the Bureaus of the Department of Commerce by :
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: 4 |
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: 2007 |
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: OCLC:873625367 |
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: 4/5 (67 Downloads) |
Synopsis Measurement of the W-boson Helicity Fractions in Top-quark Decays at CDF. by :
We present a measurement of the fractions F0 and F+ of longitudinally polarized and right-handed W bosons in top-quark decays using data collected with the CDF II detector. The data set used in the analysis corresponds to an integrated luminosity of approximately 955 pb−1. We select t{bar t} candidate events with one lepton, at least four jets, and missing transverse energy. Our helicity measurement uses the decay angle [theta]*, which is defined as the angle between the momentum of the charged lepton in the W boson rest-frame and the W momentum in the top-quark rest-frame. The cos[theta]* distribution in the data is determined by full kinematic reconstruction of the t{bar t} candidates. We find F0= 0.59 ± 0.12(stat){sup +0.07}{sub -0.06}(syst) and F+=-0.03 ± 0.06(stat){sup +0.04}{sub -0.03}(syst), which is consistent with the standard model prediction. We set an upper limit on the fraction of right-handed W bosons of F+ ≤ 0.10 at the 95% confidence level.
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: 11 |
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: 2012 |
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: OCLC:1065630107 |
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: 4/5 (07 Downloads) |
Synopsis Combination of CDF and D0 Measurements of the $W$ Boson Helicity in Top Quark Decays by :
We report the combination of recent measurements of the helicity of the W boson from top quark decay by the CDF and D0 collaborations, based on data samples corresponding to integrated luminosities of 2.7-5.4 fb−1 of p{bar p} collisions collected during Run II of the Fermilab Tevatron Collider. Combining measurements that simultaneously determine the fractions of W bosons with longitudinal (f0) and right-handed (f+) helicities, we find f0 = 0.722 ± 0.081 [± 0.062 (stat.) ± 0.052 (syst.)] and f+ = -0.033 ± 0.046 [± 0.034 (stat.) ± 0.031 (syst.)]. Combining measurements where one of the helicity fractions is fixed to the value expected in the standard model, we find f0 = 0.682 ± 0.057 [± 0.035 (stat.) ± 0.046 (syst.)] and f+ =?0.015 ± 0.035 [± 0.018 (stat.) ± 0.030 (syst.)]. The results are consistent with standard model expectations.
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: 7 |
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: 2006 |
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: OCLC:873853891 |
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: 4/5 (91 Downloads) |
Synopsis Measurement of the W Boson Helicity in Top Quark Decay at by :
The authors present a measurement of the fraction f+ of right-handed W bosons produced in top quark decays, based on a candidate sample of t{bar t} events in the l+jets and dilepton decay channels corresponding to an integrated luminosity of 370 pb−1 collected by the D0 detector at the Fermilab Tevatron p{bar p} Collider at √s = 1.96 TeV. They reconstruct the decay angle [theta]* for each lepton. By comparing the cos[theta]* distribution from the data with those for the expected background and signal for various values of f+, they find f+ = 0.056 ± 0.080(stat) ± 0.057(syst). (f+
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: 44 |
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: 2002 |
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: OCLC:873629247 |
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: 4/5 (47 Downloads) |
Synopsis A Study of Future Measurements of W Boson Helicity in T -] Wb at CDF. by :
The interactions of the top quark will soon be coming under greater scrutiny at CDF with Run II of the Fermilab Tevatron collider. This investigation gauges CDF's improved ability to measure the helicity of W bosons produced in top quark decays. Such measurements will provide a direct indication of the spin structure of the weak interaction responsible for the top decay process. Simulated CDF Run II data is used to study the W helicity sensitivity of the muon momentum in [mu] + jets events, as limited by both statistical and systematic uncertainties. Optimization of helicity measurements via appropriate choices of event variables and data criteria is also addressed.
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: Christian Schmitt |
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: 3 |
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: 2004 |
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: OCLC:316465892 |
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: 4/5 (92 Downloads) |
Synopsis Measurement of the W Helicity in T Anti-t Decays at S**(1/2) by : Christian Schmitt
Two measurements of the W-helicity in t{bar t} decays at {radical}s = 1.96 TeV have been carried out using data collected by the D0 detector. Semileptonic t{bar t} events in the electron and muon channel were used. In these events the distribution of the angle between the lepton and the direction of the top measured in the rest frame of the intermediate W boson is sensitive to the helicities of the W. The two analyses differ in the usage of lifetime tag information in the event selection. With an integrated luminosity of 168:7 pb{sup -1} and 158.4 pb{sup -1} in the e+jets and {mu}+jets channels respectively, an upper limit on the fraction f{sub +} of positive helicity W's of f{sub +}
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: 17 |
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: 2008 |
ISBN-10 |
: OCLC:727215065 |
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: 4/5 (65 Downloads) |
Synopsis Measurement of W-Boson Helicity Fractions in Top-Quark Decays Using Costheta* by :
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Total Pages |
: 342 |
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: 1796 |
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: OCLC:470098970 |
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: 4/5 (70 Downloads) |
Synopsis Forastiero illuminato interno le cose piu rare e curiose antiche e moderne della citta di Venezia e dell'isole circonvicine by :