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Search for a Vectorlike Quark with Charge 2/3 in t+Z Events from pp Collisions at √s=7  TeV

(CMS Collaboration) Chatrchyan, S.; Brigljević, Vuko; Đurić, Senka; Kadija, Krešo; Luetić, Jelena; Morović, Srećko (2011) Search for a Vectorlike Quark with Charge 2/3 in t+Z Events from pp Collisions at √s=7  TeV. Physical Review Letters, 107 (27). 271802/1-271802/15. ISSN 0031-9007

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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.

Item Type: Article
Uncontrolled Keywords: pp collisions
Subjects: NATURAL SCIENCES > Physics
Divisions: Division of Experimental Physics
Projects:
Project titleProject leaderProject codeProject type
Eksperimentalna fizika na LHC energijama[93132] Krešo Kadija098-0982887-2878MZOS
Depositing User: Krešo Kadija
Date Deposited: 17 Sep 2013 12:37
Last Modified: 03 Feb 2016 15:08
URI: http://fulir.irb.hr/id/eprint/621
DOI: 10.1103/PhysRevLett.107.271802

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