Search for pair produced fourth-generation up-type quarks in pp collisions at √s = 7 TeV with a lepton in the final state
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Chatrchyan-2012-Search for pair prod.pdf
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Author(s)
Apyan, Aram
Bendavid, Joshua L.
Busza, Wit
Butz, Erik M.
Cali, Ivan Amos
Chan, M.
Gomez-Ceballos, Guillelmo
Goncharov, Maxim
Hahn, Kristian Allan
Kim, Y.
Date Issued
October 2012
Journal
Physics Letters B
Publisher
Elsevier
Citation
Chatrchyan, S., V. Khachatryan, A.M. Sirunyan, A. Tumasyan, W. Adam, E. Aguilo, T. Bergauer, et al. “Search for Pair Produced Fourth-Generation up-Type Quarks in Pp Collisions at √s = 7 TeV with a Lepton in the Final State.” Physics Letters B 718, no. 2 (December 2012): 307–328. © 2012 CERN
Version
Final published version
Abstract
The results of a search for the pair production of a fourth-generation up-type quark (t′) in proton–proton collisions at √s = 7 TeV are presented, using data corresponding to an integrated luminosity of about 5.0 fb[superscript−1] collected by the Compact Muon Solenoid experiment at the LHC. The t′ quark is assumed to decay exclusively to a W boson and a b quark. Events with a single isolated electron or muon, missing transverse momentum, and at least four hadronic jets, of which at least one must be identified as a b jet, are selected. No significant excess of events over standard model expectations is observed. Upper limits for the t′[bar over t]′ production cross section at 95% confidence level are set as a function of t′ mass, and t′-quark production for masses below 570 GeV is excluded. The search is equally sensitive to nonchiral heavy quarks decaying to Wb. In this case, the results can be interpreted as upper limits on the production cross section times the branching fraction to Wb.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
Massachusetts Institute of Technology. School of Science
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DOI of Published Version
https://doi.org/10.1016/j.physletb.2012.10.038
