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. 2011 Dec 30;107(27):271802.
doi: 10.1103/PhysRevLett.107.271802. Epub 2011 Dec 29.

Search for a vectorlike quark with charge 2/3 in t+Z events from pp collisions at √s=7 TeV

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Hall-WiltonM HerndonA HervéP KlabbersJ KlukasA LanaroC LazaridisJ LeonardR LovelessA MohapatraI OjalvoW ParkerI RossA SavinW H SmithJ SwansonM WeinbergCMS Collaboration
Affiliations

Search for a vectorlike quark with charge 2/3 in t+Z events from pp collisions at √s=7 TeV

S Chatrchyan et al. Phys Rev Lett. .

Abstract

A search for pair-produced heavy vectorlike charge-2/3 quarks, T, in pp collisions at a center-of-mass energy of 7 TeV, is performed with the CMS detector at the LHC. Events consistent with the flavor-changing-neutral-current decay of a T quark to a top quark and a Z boson are selected by requiring two leptons from the Z-boson decay, as well as an additional isolated charged lepton. In a data sample corresponding to an integrated luminosity of 1.14 fb(-1), the number of observed events is found to be consistent with the standard model background prediction. Assuming a branching fraction of 100% for the decay T→tZ, a T quark with a mass less than 475 GeV/c(2) is excluded at the 95% confidence level.

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