Combined search for the quarks of a sequential fourth generation

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dc.citation.firstpage112003en_US
dc.citation.journalTitlePhysical Review Den_US
dc.citation.volumeNumber86en_US
dc.contributor.authorAdair, A.en_US
dc.contributor.authorBoulahouache, C.en_US
dc.contributor.authorEcklund, K.M.en_US
dc.contributor.authorGeurts, F.J.M.en_US
dc.contributor.authorPadley, B.P.en_US
dc.contributor.authorRedjimi, R.en_US
dc.contributor.authorRoberts, J.en_US
dc.contributor.authorZabel, J.en_US
dc.date.accessioned2015-08-20T18:18:34Zen_US
dc.date.available2015-08-20T18:18:34Zen_US
dc.date.issued2012en_US
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 5  fb−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 685 GeV is excluded at 95% confidence level for minimal off-diagonal mixing between the third- and the fourth-generation quarks. With a mass difference of 25 GeV between the quark masses, the obtained limit on the masses of the fourth-generation quarks shifts by about ±20  GeV. These results significantly reduce the allowed parameter space for a fourth generation of fermionsen_US
dc.identifier.citationAdair, A., Boulahouache, C., Ecklund, K.M., et al.. "Combined search for the quarks of a sequential fourth generation." <i>Physical Review D,</i> 86, (2012) American Physical Society: 112003. http://dx.doi.org/10.1103/PhysRevD.86.112003.en_US
dc.identifier.doihttp://dx.doi.org/10.1103/PhysRevD.86.112003en_US
dc.identifier.urihttps://hdl.handle.net/1911/81438en_US
dc.language.isoengen_US
dc.publisherAmerican Physical Societyen_US
dc.rightsThis is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.en_US
dc.rights.urihttp://creativecommons.org/licenses/by/3.0/en_US
dc.titleCombined search for the quarks of a sequential fourth generationen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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