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Measurement of R=B(t -> Wb)/B(t -> Wq) in top-quark-pair decays using lepton+jets events and the full CDF run II dataset

CollaborationWith : Clark, Allan Geoffrey / Lister, Alison / Wu, Xin
Published in Physical Review. D. 2013, vol. 87, no. 11, p. 111101
Abstract We present a measurement of the ratio of the top-quark branching fractions R=B(t→Wb)/B(t→Wq), where q represents quarks of type b, s, or d, in the final state with a lepton and hadronic jets. The measurement uses √s=1.96  TeV proton-antiproton collision data from 8.7  fb−1 of integrated luminosity collected with the Collider Detector at Fermilab during Run II of the Tevatron. We simultaneously measure R=0.94±0.09 (stat+syst) and the tt production cross section σtt=7.5±1.0 (stat+syst)  pb. The magnitude of the Cabibbo-Kobayashi-Maskawa matrix element, |Vtb|=0.97±0.05 (stat+syst) is extracted assuming three generations of quarks, and a lower limit of |Vtb|>0.89 at 95% credibility level is set.
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CDF COLLABORATION. Measurement of R=B(t -> Wb)/B(t -> Wq) in top-quark-pair decays using lepton+jets events and the full CDF run II dataset. In: Physical Review. D, 2013, vol. 87, n° 11, p. 111101. https://archive-ouverte.unige.ch/unige:38846

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Deposited on : 2014-07-22

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