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Título

Search for same-sign top-quark pair production at ps = 7 TeV and limits on flavour changing neutral current in the top sector

AutorChatrchyan, S.; Brochero Cifuentes, J. A. ; Cabrillo, I. J. ; Calderon, Alicia ; Chuang, S. H. ; Duarte Campderros, J. ; Felcini, Marta ; Fernández, M. ; Gómez, G. ; González Sánchez, J. ; Jorda, C. ; Lobelle Pardo, P. ; López Virto, A. ; Marco, Jesús ; Marco, Rafael ; Martínez-Rivero, Celso ; Matorras, Francisco ; Muñoz Sánchez, F. J. ; Piedra, Jonatan ; Rodrigo, Teresa ; Rodríguez Marrero, Ana Y. ; Ruiz Jimeno, Alberto ; Scodellaro, Luca ; Sobron Sañudo, M. ; Vila, Iván ; Vilar, Rocío ; CMS Collaboration
Fecha de publicación2011
EditorSpringer
CitaciónJournal of High Energy Physics 8: 5 (2011)
ResumenAn inclusive search for same-sign top-quark pair production in pp collisions at ps = 7TeV is performed using a data sample recorded with the CMS detector in 2010, corresponding to an integrated luminosity of 35 pb-1. This analysis is motivated by recent studies of pp -- tt reporting mass-dependent forward-backward asymmetries larger than expected from the standard model. These asymmetries could be due to Flavor Changing Neutral Currents (FCNC) in the top sector induced by t-channel exchange of a massive neutral vector boson (Z0). Models with such a Z0 also predict enhancement of same-sign top-pair production in pp or pp collisions. Limits are set as a function of the Z0 mass and its couplings to u and t quarks. These limits disfavour the FCNC interpretation of the Tevatron results.
URIhttp://hdl.handle.net/10261/52070
DOI10.1007/JHEP08(2011)005
Identificadoresdoi: 10.1007/JHEP08(2011)005
e-issn: 1029-8479
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