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Título

Study of top quark production and decays involving a tau lepton at CDF and limits on a charged Higgs boson contribution

Autor Aaltonen, T.; Casal, Bruno ; Cuevas, Javier ; Gómez, G. ; Palencia, Enrique ; Ruiz Jimeno, Alberto ; Scodellaro, Luca ; Vilar, Rocío ; Vila, Iván ; CDF Collaboration
Fecha de publicación 2014
EditorAmerican Physical Society
Citación Physical Review D 89: 091101(R) (2014)
ResumenWe present an analysis of top-antitop quark production and decay into a tau lepton, tau neutrino, and bottom quark using data from 9fb-1 of integrated luminosity at the Collider Detector at Fermilab. Dilepton events, where one lepton is an energetic electron or muon and the other a hadronically decaying tau lepton, originating from proton-antiproton collisions at s=1.96TeV, are used. A top-antitop quark production cross section of 8.1±2.1pb is measured, assuming standard-model top quark decays. By separately identifying for the first time the single-tau and the ditau components, we measure the branching fraction of the top quark into the tau lepton, tau neutrino, and bottom quark to be (9.6±2.8)%. The branching fraction of top quark decays into a charged Higgs boson and a bottom quark, which would imply violation of lepton universality, is limited to be less than 5.9% at a 95% confidence level [for B(H-→τν̄)=1]. © 2014 American Physical Society.
Versión del editorhttp://dx.doi.org/10.1103/PhysRevD.89.091101
URI http://hdl.handle.net/10261/110038
DOI10.1103/PhysRevD.89.091101
Identificadoresdoi: 10.1103/PhysRevD.89.091101
e-issn: 1550-2368
issn: 1550-7998
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