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Measurement of the ratio B(t→Wb)/B(t→Wq) in pp collisions at √s=8 TeV

AutorChatrchyan, S.; Brochero Cifuentes, J. A. ; Cabrillo, I. J. ; Calderon, Alicia ; Chuang, S. H. ; Duarte Campderros, J. ; Fernández, M. ; Gómez, G. ; González Sánchez, J. ; Graziano, A. ; López Virto, A. ; Marco, Jesús ; Marco, Rafael ; Martínez-Rivero, Celso ; Matorras, Francisco ; Muñoz Sánchez, F. J. ; Piedra, Jonatan ; Rodrigo, Teresa ; Rodríguez Marrero, Ana Y. ; Ruiz Jimeno, Alberto ; Scodellaro, Luca ; Vila, Iván ; Vilar, Rocío ; CMS Collaboration
Fecha de publicación2014
EditorElsevier
CitaciónPhysics Letters B 736: 33-57 (2014)
ResumenThe ratio of the top-quark branching fractions R=B(t→Wb)/B(t→Wq), where the denominator includes the sum over all down-type quarks (q = b, s, d), is measured in the tt- dilepton final state with proton-proton collision data at s=8 TeV from an integrated luminosity of 19.7 fb-1, collected with the CMS detector. In order to quantify the purity of the signal sample, the cross section is measured by fitting the observed jet multiplicity, thereby constraining the signal and background contributions. By counting the number of b jets per event, an unconstrained value of R=1.014±0.003(stat.)±0.032(syst.) is measured, in a good agreement with current precision measurements in electroweak and flavour sectors. A lower limit R>0.955 at the 95% confidence level is obtained after requiring R≤1, and a lower limit on the Cabibbo-Kobayashi-Maskawa matrix element |Vtb| > 0.975 is set at 95% confidence level. The result is combined with a previous CMS measurement of the t-channel single-top-quark cross section to determine the top-quark total decay width, Γt=1.36±0.02(stat.)-0.11+0.14(syst.) GeV. © 2014 Elsevier B.V.
DescripciónUnder a Creative Commons license.-- et al.
Versión del editorhttp://dx.doi.org/10.1016/j.physletb.2014.06.076
URIhttp://hdl.handle.net/10261/110395
DOI10.1016/j.physletb.2014.06.076
Identificadoresdoi: 10.1016/j.physletb.2014.06.076
issn: 0370-2693
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