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| Título: | Search for flavor-changing neutral currents in top-quark decays t →zq in pp collisions at √s = 8TeV |
Autor: | Chatrchyan, S.; Brochero Cifuentes, J. A. CSIC ORCID; Cabrillo, I. J. CSIC ORCID ; Calderon, Alicia ; Chuang, S. H. CSIC; Duarte Campderros, J. CSIC ORCID ; Fernández-García, Marcos CSIC ORCID ; Gómez, Gervasio CSIC ORCID ; González Sánchez, J. CSIC ; Graziano, A. CSIC; López Virto, A. CSIC ORCID ; Marco, Jesús CSIC ORCID ; Marco, Rafael CSIC; Martínez-Rivero, Celso CSIC ORCID ; Matorras, Francisco CSIC ORCID ; Muñoz Sánchez, F. J. CSIC ORCID; Piedra, Jonatan CSIC ORCID ; Rodrigo, Teresa CSIC ORCID ; Rodríguez Marrero, Ana Y. CSIC; Ruiz Jimeno, Alberto CSIC ORCID ; Scodellaro, Luca CSIC ORCID ; Vila, Iván CSIC ORCID; Vilar Cortabitarte, R. CSIC ORCID; CMS Collaboration | Fecha de publicación: | 2014 | Editor: | American Physical Society | Citación: | Physical Review Letters 112: 171802 (2014) | Resumen: | A 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. | Descripción: | This article is available under the terms of the Creative Commons Attribution 3.0 License.-- et al. | Versión del editor: | http://dx.doi.org/10.1103/PhysRevLett.112.171802 | URI: | http://hdl.handle.net/10261/110113 | DOI: | 10.1103/PhysRevLett.112.171802 | Identificadores: | doi: 10.1103/PhysRevLett.112.171802 e-issn: 1079-7114 issn: 0031-9007 |
| Aparece en las colecciones: | (IFCA) Artículos |
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| Search for Flavor-Changing Neutral.pdf | 378,07 kB | Adobe PDF |  Visualizar/Abrir |
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