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dc.contributor.authorChatrchyan, S.-
dc.contributor.authorBrochero Cifuentes, J. A.-
dc.contributor.authorCabrillo, I. J.-
dc.contributor.authorCalderon, Alicia-
dc.contributor.authorChuang, S. H.-
dc.contributor.authorDuarte Campderros, J.-
dc.contributor.authorFelcini, Marta-
dc.contributor.authorFernández, M.-
dc.contributor.authorGómez, G.-
dc.contributor.authorGonzález Sánchez, J.-
dc.contributor.authorGraziano, A.-
dc.contributor.authorJorda, C.-
dc.contributor.authorLópez Virto, A.-
dc.contributor.authorMarco, Jesús-
dc.contributor.authorMarco, Rafael-
dc.contributor.authorMartínez-Rivero, Celso-
dc.contributor.authorMatorras, Francisco-
dc.contributor.authorMuñoz Sánchez, F. J.-
dc.contributor.authorRodrigo, Teresa-
dc.contributor.authorRodríguez Marrero, Ana Y.-
dc.contributor.authorRuiz Jimeno, Alberto-
dc.contributor.authorScodellaro, Luca-
dc.contributor.authorSobron Sañudo, M.-
dc.contributor.authorVila, Iván-
dc.contributor.authorVilar, Rocío-
dc.contributor.authorCMS Collaboration-
dc.date.accessioned2014-12-11T13:02:30Z-
dc.date.available2014-12-11T13:02:30Z-
dc.date.issued2012-
dc.identifierdoi: 10.1103/PhysRevD.86.112003-
dc.identifierissn: 1550-7998-
dc.identifiere-issn: 1550-2368-
dc.identifier.citationPhysical Review D 86: 112003 (2012)-
dc.identifier.urihttp://hdl.handle.net/10261/108641-
dc.descriptionChatrchyan, S. et al.-
dc.description.abstractResults are presented from a search for a fourth generation of quarks produced singly or in pairs in a data set corresponding to an integrated luminosity of 5fb-1 recorded by the CMS experiment at the LHC in 2011. A novel strategy has been developed for a combined search for quarks of the up and down type in decay channels with at least one isolated muon or electron. Limits on the mass of the fourth-generation quarks and the relevant Cabibbo-Kobayashi-Maskawa matrix elements are derived in the context of a simple extension of the standard model with a sequential fourth generation of fermions. The existence of mass-degenerate fourth-generation quarks with masses below 685GeV is excluded at 95% confidence level for minimal off-diagonal mixing between the third- and the fourth-generation quarks. With a mass difference of 25GeV between the quark masses, the obtained limit on the masses of the fourth-generation quarks shifts by about ±20GeV. These results significantly reduce the allowed parameter space for a fourth generation of fermions. © 2012 CERN.-
dc.description.sponsorshipAcknowledge support from BMWF and FWF (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); MoER, SF0690030s09 and ERDF (Estonia); Academy of Finland, MEC, 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); MSI (New Zealand); PAEC (Pakistan); MSHE and NSC (Poland); FCT (Portugal); JINR (Armenia, Belarus, Georgia, Ukraine, Uzbekistan); MON, RosAtom, RAS and RFBR (Russia); MSTD (Serbia); SEIDI and CPAN (Spain); Swiss Funding Agencies (Switzerland); NSC (Taipei); ThEP, IPST and NECTEC (Thailand); TUBITAK and TAEK (Turkey); NASU (Ukraine); STFC (United Kingdom); DOE and NSF (USA). Individuals have received support from the Marie-Curie program and the European Research Council (European Union); the Leventis Foundation; the A. P. Sloan Foundation; the Alexander von Humboldt Foundation; the Austrian Science Fund (FWF); the Belgian Federal Science Policy Office; the Fonds pour la Formation à la Recherche dans l’Industrie et dans l’Agriculture (FRIA-Belgium); the Agentschap voor Innovatie door Wetenschap en Technologie (IWTBelgium); the Ministry of Education, Youth and Sports (MEYS) of Czech Republic; the Council of Science and Industrial Research, India; the Compagnia di San Paolo (Torino); and the HOMING PLUS program of Foundation for Polish Science, cofinanced from European Union, Regional Development Fund.-
dc.publisherAmerican Physical Society-
dc.relation.isversionofPublisher's version-
dc.rightsopenAccess-
dc.titleCombined search for the quarks of a sequential fourth generation-
dc.typeartículo-
dc.identifier.doi10.1103/PhysRevD.86.112003-
dc.relation.publisherversionhttp://dx.doi.org/10.1103/PhysRevD.86.112003-
dc.date.updated2014-12-11T13:02:30Z-
dc.description.versionPeer Reviewed-
dc.language.rfc3066eng-
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