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dc.contributor.authorCMS Collaboration
dc.contributor.authorKarapınar, Güler
dc.date.accessioned2017-04-04T13:04:17Z
dc.date.available2017-04-04T13:04:17Z
dc.date.issued2012-12
dc.identifier.citationChatrchyan, S, Khachatryan, V., Sirunyan, A.M., Tumasyan, A., Adam, W., Aguilo, E., Bergauer, T., ...CMS Collaboration (2012). Combined search for the quarks of a sequential fourth generation. Physical Review D - Particles, Fields, Gravitation and Cosmology, 86(11). doi:10.1103/PhysRevD.86.112003en_US
dc.identifier.issn1550-7998
dc.identifier.urihttp://doi.org/10.1103/PhysRevD.86.112003
dc.identifier.urihttp://hdl.handle.net/11147/5220
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.en_US
dc.description.sponsorshipThe Scientific and Technical Research Council of Turkey, and Turkish Atomic Energy Authorityen_US
dc.language.isoengen_US
dc.publisherAmerican Physical Societyen_US
dc.relation.isversionof10.1103/PhysRevD.86.112003en_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectLimits on production of particlesen_US
dc.subjectStandard modelen_US
dc.subjectQuarksen_US
dc.titleCombined search for the quarks of a sequential fourth generationen_US
dc.typearticleen_US
dc.contributor.iztechauthorKarapınar, Güler
dc.relation.journalPhysical Review D - Particles, Fields, Gravitation and Cosmologyen_US
dc.contributor.departmentİYTE, Fen Fakültesi, Matematik Bölümüen_US
dc.identifier.volume86en_US
dc.identifier.issue11en_US
dc.identifier.wosWOS:000312294500001
dc.identifier.scopusSCOPUS:2-s2.0-84871203513


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