We present a measurement of the ratio of the top-quark branching fractions R=B(t→Wb)/B(t→Wq), where q represents quarks of type b, s, or d, in the final state with a lepton and hadronic jets. The measurement uses √s=1.96 TeV proton-antiproton collision data from 8.7 fb-1 of integrated luminosity collected with the Collider Detector at Fermilab during Run II of the Tevatron. We simultaneously measure R=0.94±0.09 (stat+syst) and the tt̄ production cross section σtt̄=7. 5±1.0 (stat+syst) pb. The magnitude of the Cabibbo-Kobayashi-Maskawa matrix element, |Vtb|=0.97±0.05 (stat+syst) is extracted assuming three generations of quarks, and a lower limit of |V tb|>0.89 at 95% credibility level is set. © 2013 American Physical Society.
Digital Object Identifier (DOI): | http://dx.doi.org/10.1103/PhysRevD.87.111101 | |
Codice identificativo ISI: | WOS:000319911500001 | |
Codice identificativo Scopus: | 2-s2.0-84879090159 | |
Handle: | http://hdl.handle.net/11695/64528 | |
URL: | http://oai.aps.org/filefetch?identifier=10.1103/PhysRevD.87.111101&component=fulltext&description=markup&format=xml | |
Titolo: | Measurement of R=B(t→Wb)/B(t→Wq) in top-quark-pair decays using lepton+jets events and the full CDF run II dataset | |
Autori: | ||
Appare nelle tipologie: | 1.1 Articolo in rivista |