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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

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.
Authors:
 [1]
  1. Univ. of Helsinki (Finland). et al.
Publication Date:
OSTI Identifier:
1151741
Report Number(s):
FERMILAB-PUB--14-099-E
Journal ID: ISSN 0031-9007; PRLTAO; ArticleNumber: 221801
DOE Contract Number:
AC02-07CH11359
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 112; Journal Issue: 22
Publisher:
American Physical Society (APS)
Research Org:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Orgs:
CDF Collaboration
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS hep-ex; High Energy Physics; HEP