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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)
Publisher: Elsevier
Publication date: 01/09/2014
No. of pages: 27
Publication type: Article
DOI: 10.1016/j.physletb.2014.07.053
ISSN: 0370-2693,1873-2445
Spanish project: FPA2014-55295-C3-1-R ; FPA 2011-28694-C02-01
Publication Url: https://doi.org/10.1016/j.physletb.2014.07.053
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KHACHATRYAN, VLADIMIR
JAVIER ANDRES BROCHERO CIFUENTES
JOSE IBAN CABRILLO BARTOLOME
ALICIA CALDERON TAZON
JORGE DUARTE CAMPDERROS
MARCOS FERNANDEZ GARCIA
GERVASIO GOMEZ GRAMUGLIO
ALBERTO GRAZIANO
MARIA AMPARO LOPEZ VIRTO
JESUS MARCO DE LUCAS
RAFAEL JOSE MARCO DE LUCAS
CELSO MARTINEZ RIVERO
FRANCISCO MATORRAS WEINIG
FRANCISCA JAVIELA MUÑOZ SANCHEZ
JONATAN PIEDRA GOMEZ
MARIA TERESA RODRIGO ANORO
ANA YAIZA RODRIGUEZ MARRERO
ALBERTO RUIZ JIMENO
LUCA SCODELLARO
IVAN VILA ALVAREZ
ROCIO VILAR CORTABITARTE
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