Measurement of B(tWb)/B(tWq) in Top-Quark-Pair Decays Using Dilepton Events and the Full CDF Run II Data Set

T. Aaltonen et al. (CDF Collaboration)
Phys. Rev. Lett. 112, 221801 – Published 2 June 2014

Abstract

We present a measurement of the ratio of the top-quark branching fractions R=B(tWb)/B(tWq), 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 8.7fb1 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.

  • Figure
  • Received 13 April 2014

DOI:https://doi.org/10.1103/PhysRevLett.112.221801

© 2014 American Physical Society

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Vol. 112, Iss. 22 — 6 June 2014

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