Karapınar, GülerDemir, Durmuş Ali2017-02-242017-02-242011Chatrchyan, S, Khachatryan, V., Sirunyan, A.M., Tumasyan, A., Adam, W., Bergauer, T., Dragicevic, M.,...CMS Collaboration (2012). Search for a vectorlike quark with charge 2/3 in t+Z events from pp collisions at √s=7TeV. Physical Review Letters, 107(27). doi:10.1103/PhysRevLett.107.2718020031-90071079-7114http://doi.org/10.1103/PhysRevLett.107.271802https://hdl.handle.net/11147/4906A 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 1.14fb -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 475GeV/c 2 is excluded at the 95% confidence level. © 2011 CERN.eninfo:eu-repo/semantics/openAccessHigh energy physicsBosonsTellurium compoundsCMS detectorsArticle2-s2.0-8485533771510.1103/PhysRevLett.107.27180210.1103/PhysRevLett.107.271802