Search for standard model production of four top quarks in the lepton + jets channel in pp collisions at √s = 8 TeV

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URI: http://hdl.handle.net/10902/14004
ISSN: 1126-6708
ISSN: 1029-8479
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Autoría
Khachatryan, Vladimir; Brochero Cifuentes, Javier AndrésAutoridad Unican; Cabrillo Bartolomé, José IbanAutoridad Unican; Calderón Tazón, AliciaAutoridad Unican; Duarte Campderros, JorgeAutoridad Unican; Fernández García, MarcosAutoridad Unican; Gómez Gramuglio, GervasioAutoridad Unican; Graziano, Alberto; López Virto, María Amparo; Marco de Lucas, JesúsAutoridad Unican; Marco de Lucas, Rafael José; Martínez Rivero, Celso; Matorras Weinig, FranciscoAutoridad Unican; Muñoz Sánchez, Francisca Javiela; Piedra Gómez, JonatanAutoridad Unican; Rodrigo Anoro, TeresaAutoridad Unican; Rodríguez Marrero, Ana Yaiza; Ruiz Jimeno, AlbertoAutoridad Unican; Scodellaro, LucaAutoridad Unican; [et al.]
Fecha
2014-11
Derechos
Attribution 4.0 International © CERN for the benefit of the CMS collaboration
Publicado en
Journal of High Energy Physics, Vol. 2014, Num. 11, Art. Num. 154
Editorial
Springer Verlag
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Resumen/Abstract
A search is presented for standard model (SM) production of four top quarks (tt¯tt¯) in pp collisions in the lepton + jets channel. The data correspond to an integrated luminosity of 19.6 fb-1 recorded at a centre-of-mass energy of 8 TeV with the CMS detector at the CERN LHC. The expected cross section for SM tt¯tt¯ production is sSMtt¯tt¯˜1fb. A combination of kinematic reconstruction and multivariate techniques is used to distinguish between the small signal and large background. The data are consistent with expectations of the SM, and an upper limit of 32 fb is set at a 95% confidence level on the cross section for producing four top quarks in the SM, where a limit of 32 ± 17 fb is expected.
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