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Search for Flavor-Changing Neutral Currents in Top-Quark Decays t → Zq in pp Collisions at √s = 8 TeV

Author(s)
Apyan, Aram; Barbieri, Riccardo; Bauer, Gerry P.; Busza, Wit; Cali, Ivan Amos; Chan, M.; Di Matteo, Leonardo; Dutta, V.; Gomez-Ceballos, Guillelmo; Goncharov, Maxim; Gulhan, Doga Can; Klute, Markus; Lai, Yue Shi; Lee, Y.-J.; Levin, A.; Luckey, P. David, Jr.; Ma, Teng; Paus, Christoph M. E.; Ralph, Duncan Kelley; Roland, Christof E.; Roland, Gunther M.; Stephans, George S. F.; Stockli, Fabian; Sumorok, Konstanty C.; Velicanu, Dragos Alexandru; Veverka, Jan; Wyslouch, Boleslaw; Yang, M.; Yoon, A. S.; Zanetti, Marco; Zhukova, Victoria; ... Show more Show less
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Abstract
A search for flavor-changing neutral currents in top-quark decays t → Zq is performed in events produced from the decay chain t[bar over t] → Zq + Wb, where both vector bosons decay leptonically, producing a final state with three leptons (electrons or muons). A data set collected with the CMS detector at the LHC is used, corresponding to an integrated luminosity of 19.7  fb[superscript −1] of proton-proton collisions at a center-of-mass energy of 8 TeV. No excess is seen in the observed number of events relative to the standard model prediction; thus, no evidence for flavor-changing neutral currents in top-quark decays is found. A combination with a previous search at 7 TeV excludes a t → Zq branching fraction greater than 0.05% at the 95% confidence level.
Date issued
2014-05
URI
http://hdl.handle.net/1721.1/88724
Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science; Massachusetts Institute of Technology. School of Science
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Chatrchyan, S., et al. "Search for Flavor-Changing Neutral Currents in Top-Quark Decays t → Zq in pp Collisions at √s = 8 TeV." Phys. Rev. Lett. 112, 171802 (May 2014). © 2014 CERN, for the CMS Collaboration
Version: Final published version
ISSN
0031-9007
1079-7114

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