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Title

Measurement of B(t →wb)/B (t →wq) in top-quark-pair decays using dilepton events and the full CDF run II data set

AuthorsAaltonen, T.; Casal, Bruno ; Cuevas, Javier ; Gómez, G. ; Palencia, Enrique ; Ruiz Jimeno, Alberto ; Scodellaro, Luca ; Vilar, Rocío ; Vizán, J. ; CDF Collaboration
Issue Date2014
PublisherAmerican Physical Society
CitationPhysical Review Letters 112: 221801 (2014)
AbstractWe 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 8.7fb-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%) credibility level is set. © 2014 American Physical Society.
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevLett.112.221801
URIhttp://hdl.handle.net/10261/110406
DOI10.1103/PhysRevLett.112.221801
Identifiersdoi: 10.1103/PhysRevLett.112.221801
e-issn: 1079-7114
issn: 0031-9007
Appears in Collections:(IFCA) Artículos
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