2026-10-19T00:02:46Zhttps://ebyu-rdlopen.rawdatalibrary.net/oai/requestoai:ebyu-rdlopen.rawdatalibrary.net:ebyu/156252026-10-18T20:30:28Zopenairedrivercom_ebyu_10000col_ebyu_10001Search for a vectorlike quark with charge 2/3 in t+Z events from pp collisions at √s=7TeVChatrchyan, S.Khachatryan, V.Sirunyan, A.M.Tumasyan, A.Adam, W.Bergauer, T.Dragicevic, M.Erö, J.Fabjan, C.Friedl, M.Frühwirth, R.Ghete, V.M.Hammer, J.Hänsel, S.Hoch, M.Hörmann, N.Hrubec, J.Jeitler, M.Kiesenhofer, W.Krammer, M.Liko, D.Mikulec, I.Pernicka, M.Rahbaran, B.Rohringer, H.Schöfbeck, R.Strauss, J.Taurok, A.Teischinger, F.Trauner, C.Wagner, P.Waltenberger, W.Walzel, G.Widl, E.Wulz, C.-E.Mossolov, V.Shumeiko, N.Suarez Gonzalez, J.Bansal, S.Benucci, L.De Wolf, E.A.Janssen, X.Luyckx, S.Maes, T.Mucibello, L.Ochesanu, S.Roland, B.Rougny, R.Selvaggi, M.Van Haevermaet, H.BosonsTellurium compoundsBackground predictionBranching fractionsCenter-of-mass energiesCharged leptonsCMS detectorsConfidence levelsData sampleIntegrated luminosityThe standard modelZ BosonsHigh energy physicsA 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.2011Articlehttps://rdlopen.rawdatalibrary.net/r/ebyu/15625https://doi.org/10.1103/physrevlett.107.2718021079-7114enPhysical Review Lettersinfo:eu-repo/semantics/openAccessinfo:eu-repo/semantics/articlehttps://ebyu-rdlopen.rawdatalibrary.net/tr/items/ebyu/15625