Measurement of B (t →wb) /B (t →wq) in top-quark-pair decays using dilepton events and the full CDF run II data set

CDF Collaboration

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We present a measurement of the ratio of the top-quark branching fractions R=B(t→Wb)/B(t→Wq), where q represents any quark flavor, in events with two charged leptons, imbalance in total transverse energy, and at least two jets. The measurement uses proton-antiproton collision data at center-of-mass energy 1.96 TeV, corresponding to an integrated luminosity of 8.7fb-1 collected with the Collider Detector at Fermilab during Run II of the Tevatron. We measure R to be 0.87±0.07, and extract the magnitude of the top-bottom quark coupling to be |Vtb|=0.93±0.04, assuming three generations of quarks. Under these assumptions, a lower limit of |Vtb|>0.85(0.87) at 95% (90%) credibility level is set.

Original languageEnglish
Article number221801
JournalPhysical Review Letters
Issue number22
Publication statusPublished - 2014 Jun 2


ASJC Scopus subject areas

  • Physics and Astronomy(all)

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