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Title

Search for flavor-changing neutral currents in top-quark decays t →zq in pp collisions at √s = 8TeV

AuthorsChatrchyan, 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
Issue Date2014
PublisherAmerican Physical Society
CitationPhysical Review Letters 112: 171802 (2014)
AbstractA search for flavor-changing neutral currents in top-quark decays t→Zq is performed in events produced from the decay chain tt̄→Zq+Wb, where both vector bosons decay leptonically, producing a final state with three leptons (electrons or muons). A data set collected with the CMS detector at the LHC is used, corresponding to an integrated luminosity of 19.7fb-1 of proton-proton collisions at a center-of-mass energy of 8 TeV. No excess is seen in the observed number of events relative to the standard model prediction; thus, no evidence for flavor-changing neutral currents in top-quark decays is found. A combination with a previous search at 7 TeV excludes a t→Zq branching fraction greater than 0.05% at the 95% confidence level. © 2014 CERN, for the CMS Collaboration.
DescriptionThis article is available under the terms of the Creative Commons Attribution 3.0 License.-- et al.
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevLett.112.171802
URIhttp://hdl.handle.net/10261/110113
DOI10.1103/PhysRevLett.112.171802
Identifiersdoi: 10.1103/PhysRevLett.112.171802
e-issn: 1079-7114
issn: 0031-9007
Appears in Collections:(IFCA) Artículos
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