Search for vector-like charge 2/3 T quarks in proton-proton collisions at sqrt(s) = 8 TeV

CMS Collaboration, Shimaa Abu Zeid, Freya Blekman, Jorgen D'Hondt, Nadir Daci, Isabelle Helena De Bruyn, Kevin Deroover, Natalie Heracleous, James Keaveney, Steven Lowette, Lieselotte Moreels, Annik Olbrechts, Quentin Python, Derek Strom, Stefaan Tavernier, Walter Van Doninck, Petra Van Mulders, Gerrit Van Onsem, Isis Marina Van Parijs

Research output: Contribution to journalArticlepeer-review

81 Citations (Scopus)


A search for fermionic top quark partners T of charge 2/3 is presented. The search is carried out in proton-proton collisions corresponding to an integrated luminosity of 19.7  fb−1 collected at a center-of-mass energy of s√=8  TeV with the CMS detector at the LHC. The T quarks are assumed to be produced strongly in pairs and can decay into tH, tZ, and bW. The search is performed in five exclusive channels: a single-lepton channel, a multilepton channel, two all-hadronic channels optimized either for the bW or the tH decay, and one channel in which the Higgs boson decays into two photons. The results are found to be compatible with the standard model expectations in all the investigated final states. A statistical combination of these results is performed and lower limits on the T quark mass are set. Depending on the branching fractions, lower mass limits between 720 and 920 GeV at 95% confidence level are found. These are among the strongest limits on vectorlike T quarks obtained to date.
Original languageEnglish
Article number012003
Pages (from-to)012003-1 - 012003-30
Number of pages30
JournalPhysical Review D
Issue number1
Publication statusPublished - 19 Jan 2016


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