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

Author(s)
Alver, Burak Han; Bendavid, Joshua L.; Busza, Wit; Butz, Erik M.; Cali, Ivan Amos; Chan, M.; Dutta, Valentina; Everaerts, Pieter Bruno Bart; Gomez-Ceballos, Guillelmo; Goncharov, Maxim; Hahn, Kristian Allan; Kim, Y.; Klute, Markus; Li, W.; Ma, Teng; Nahn, Steven; Paus, Christoph M. E.; Ralph, Duncan Kelley; Stephans, George S. F.; Velicanu, Dragos Alexandru; Wenger, Edward Allen; Wyslouch, Boleslaw; Yilmaz, Yetkin; Yoon, A. S.; Zanetti, Marco; Yang, Mingming; Bauer, Gerry P; Lee, Yen-Jie; Loizides, Constantinos; Roland, Christof E; Rudolph, Matthew Scott; Stoeckli, Fabian; Sung, Kevin Kai Hong; Wolf, Roger; Xie, Si; Harris, Philip Coleman; Luckey Jr, P David; Roland, Gunther M; Sumorok, Konstanty C; ... Show more Show less
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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[superscript -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[superscript 2] is excluded at the 95% confidence level.
Date issued
2011-12
URI
http://hdl.handle.net/1721.1/71566
Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
S. Chatrchyan et al. "Search for a Vectorlike Quark with Charge 2/3 in t+Z Events from pp Collisions at √s=7  TeV" Physical review Letters 107, 271802 (2011). © 2011 CERN, for the CMS Collaboration
Version: Final published version
ISSN
0031-9007
1079-7114

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