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

Aaltonen, Timo Antero

doi:10.1103/PhysRevLett.112.221801

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

Journal Article · Mon Jun 02 00:00:00 EDT 2014 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.112.221801· OSTI ID:1151741

Aaltonen, Timo Antero ^[1]

Univ. of Helsinki (Finland). et al.

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^-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) percent credibility level is set.

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Research Organization:: Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Contributing Organization:: CDF Collaboration

DOE Contract Number:: AC02-07CH11359

OSTI ID:: 1151741

Report Number(s):: FERMILAB-PUB-14-099-E; PRLTAO; ArticleNumber: 221801

Journal Information:: Physical Review Letters, Vol. 112, Issue 22; ISSN 0031-9007

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

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