@article{10902/26914,
year = {2011},
url = {https://hdl.handle.net/10902/26914},
abstract = {An inclusive search for same-sign top-quark pair production in pp collisions at √s = 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 (Z’). Models with such a Z' also predict enhancement of same-sign top-pair production in pp or pp ̅  collisions. Limits are set as a function of the Z’ mass and its couplings to u and t quarks. These limits disfavour the FCNC interpretation of the Tevatron results.},
organization = {We thank Johan Alwall, Ed Berger, Qing-Hong Cao, Chuan-Ren Chen, Chong-Sheng   Li and Hao Zhang for discussions and help in implementing the Z0 model in Mad-   Graph/MadEvent. We wish to congratulate our colleagues in the CERN accelerator   departments for the excellent performance of the LHC machine. We thank the technical   and administrative sta_ at CERN and other CMS institutes, and acknowledge support   from: FMSR (Austria); FNRS and FWO (Belgium); CNPq, CAPES, FAPERJ, and   FAPESP (Brazil); MES (Bulgaria); CERN; CAS, MoST, and NSFC (China); COLCIENCIAS   (Colombia); MSES (Croatia); RPF (Cyprus); Academy of Sciences and NICPB (Estonia); Academy of Finland, ME, and HIP (Finland); CEA and CNRS/IN2P3 (France);   BMBF, DFG, and HGF (Germany); GSRT (Greece); OTKA and NKTH (Hungary); DAE   and DST (India); IPM (Iran); SFI (Ireland); INFN (Italy); NRF and WCU (Korea); LAS   (Lithuania); CINVESTAV, CONACYT, SEP, and UASLP-FAI (Mexico); PAEC (Pakistan);   SCSR (Poland); FCT (Portugal); JINR (Armenia, Belarus, Georgia, Ukraine,   Uzbekistan); MST and MAE (Russia); MSTD (Serbia); MICINN and CPAN (Spain);   Swiss Funding Agencies (Switzerland); NSC (Taipei); TUBITAK and TAEK (Turkey);   STFC (United Kingdom); DOE and NSF (USA).},
publisher = {Springer Verlag},
publisher = {Journal of High Energy Physics, 2011, 5},
title = {Search for same-sign top-quark pair production at √s=7 TeV and limits on flavour changing neutral currents in the top sector.},
author = {Chatrchyan, Seguei and Brochero Cifuentes, Javier Andrés and Cabrillo Bartolomé, José Iban and Calderón Tazón, Alicia and Chuang, S. H. and Duarte Campderros, Jorge and Felcini, Marta and Fernández García, Marcos and Gómez Gramuglio, Gervasio and González Sánchez, Francisco Javier and Jordá Lope, Clara and Lobelle Pardo, Patricia and López Virto, María Amparo and Marco de Lucas, Jesús and Marco de Lucas, Rafael José and Martínez Rivero, Celso and Matorras Weinig, Francisco and Muñoz Sánchez, Francisca Javiela and Piedra Gómez, Jonatan and Rodrigo Anoro, Teresa and Rodríguez Marrero, Ana Yaiza},
}