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Measurement of B(t → Wb)/B(t → Wq) in Top-Quark-Pair Decays Using Dilepton Events and the Full CDF Run II Data Set

Author(s)
Gomez-Ceballos, Guillelmo; Goncharov, Maxim; Paus, Christoph M. E.
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Abstract
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 8.7  fb[superscript −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 |V[subscript tb]| = 0.93 ± 0.04, assuming three generations of quarks. Under these assumptions, a lower limit of |V[subscript tb]| > 0.85(0.87) at 95% (90%) credibility level is set.
Date issued
2014-06
URI
http://hdl.handle.net/1721.1/90888
Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Aaltonen, T., S. Amerio, D. Amidei, A. Anastassov, A. Annovi, J. Antos, G. Apollinari, et al. “Measurement of B(t → Wb)/B(t → Wq) in Top-Quark-Pair Decays Using Dilepton Events and the Full CDF Run II Data Set.” Physical Review Letters 112, no. 22 (June 2014). © 2014 American Physical Society
Version: Final published version
ISSN
0031-9007
1079-7114

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