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Search for Flavor-Changing Neutral Currents in Top-Quark Decays t ? Zq in pp Collisions at vs = 8??TeV

Abstract: A search for flavor-changing neutral currents in top-quark decays t ? Zq is performed in events produced from the decay chain tt¯ ? 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 19.7?fb-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.

Otras publicaciones de la misma revista o congreso con autores/as de la Universidad de Cantabria

 Fuente: Phys. Rev. Lett. Vol. 112, Num. 17 Pag. 171802, (2014)

Editorial: American Physical Society

 Fecha de publicación: 01/05/2014

Nº de páginas: 16

Tipo de publicación: Artículo de Revista

 DOI: 10.1103/PhysRevLett.112.171802

ISSN: 0031-9007,1079-7114

Proyecto español: FPA2014-55295-C3-1-R ; FPA 2011-28694-C02-01

Url de la publicación: https://doi.org/10.1103/PhysRevLett.112.171802