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Search for top-squark pairs decaying into Higgs or Z bosons in pp collisions at vs=8 TeV

Abstract: A search for supersymmetry through the direct pair production of top squarks, with Higgs (H) or Z bosons in the decay chain, is performed using a data sample of proton–proton collisions at vs=8 TeV collected in 2012 with the CMS detector at the LHC. The sample corresponds to an integrated luminosity of 19.5fb-1. The search is performed using a selection of events containing leptons and bottom-quark jets. No evidence for a significant excess of events over the standard model background prediction is observed. The results are interpreted in the context of simplified supersymmetric models with pair production of a heavier top-squark mass eigenstate ˜t2 decaying to a lighter top-squark mass eigenstate ˜t1 via either ˜t2?H˜t1or ˜t2?Z˜t1, followed in both cases by ˜t1?t˜?01, where ˜?01 is an undetected, stable, lightest supersymmetric particle. The interpretation is performed in the region where the mass difference between the ˜t1and ˜?01 states is approximately equal to the top-quark mass (m˜t1-m˜?01 mt), which is not probed by searches for direct ˜t1 squark pair production. The analysis excludes top squarks with masses m˜t2<575GeVand m˜t1<400GeVat a 95% confidence level.

 Fuente: Physics Letters B, Vol. 736, Pp. 371–397, (2014)

 Editorial: Elsevier

 Fecha de publicación: 01/09/2014

 Nº de páginas: 27

 Tipo de publicación: Artículo de Revista

 DOI: 10.1016/j.physletb.2014.07.053

 ISSN: 0370-2693,1873-2445

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

 Url de la publicación: https://doi.org/10.1016/j.physletb.2014.07.053

Autoría

KHACHATRYAN, VLADIMIR

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