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 Detalle_Publicacion

Search for anomalous production of events with three or more leptons in pp collisions at sv=8??TeV

Abstract: A search for physics beyond the standard model in events with at least three leptons is presented. The data sample, corresponding to an integrated luminosity of 19.5??fb-1 of proton-proton collisions with center-of-mass energy vs=8??TeV, was collected by the CMS experiment at the LHC during 2012. The data are divided into exclusive categories based on the number of leptons and their flavor, the presence or absence of an opposite-sign, same-flavor lepton pair (OSSF), the invariant mass of the OSSF pair, the presence or absence of a tagged bottom-quark jet, the number of identified hadronically decaying t leptons, and the magnitude of the missing transverse energy and of the scalar sum of jet transverse momenta. The numbers of observed events are found to be consistent with the expected numbers from standard model processes, and limits are placed on new-physics scenarios that yield multilepton final states. In particular, scenarios that predict Higgs boson production in the context of supersymmetric decay chains are examined. We also place a 95% confidence level upper limit of 1.3% on the branching fraction for the decay of a top quark to a charm quark and a Higgs boson (t?cH), which translates to a bound on the left- and right-handed top-charm flavor-violating Higgs Yukawa couplings, ?Htc and ?Hct, respectively, of v|?Htc|2+|?Hct|2<0.21.

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

 Fuente: Phys. Rev. D, Vol. 90, Num. 3, Pag. 032006 (2014)

Editorial: American Physical Society

 Fecha de publicación: 01/08/2014

Nº de páginas: 27

Tipo de publicación: Artículo de Revista

 DOI: 10.1103/PhysRevD.90.032006

ISSN: 1550-7998,1550-2368,2470-0010,2470-0029

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

Url de la publicación: https://doi.org/10.1103/PhysRevD.90.032006

Autores/as

CHATRCHYAN, SERGUEI

JAVIER ANDRES BROCHERO CIFUENTES

MARCOS FERNANDEZ GARCIA

ALBERTO GRAZIANO

MARIA AMPARO LOPEZ VIRTO

RAFAEL JOSE MARCO DE LUCAS

FRANCISCA JAVIELA MUÑOZ SANCHEZ

ANA YAIZA RODRIGUEZ MARRERO