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Search for vectorlike charge 2/3T quarks in proton-proton collisions at √(s) = 8 TeV

Author(s)
Apyan, Aram; Barbieri, Richard Alexander; Baty, Austin Alan; Bierwagen, Katharina; Brandt, Stephanie Akemi; Busza, Wit; Cali, Ivan Amos; Demiragli, Zeynep; Di Matteo, Leonardo; Gomez-Ceballos, Guillelmo; Goncharov, Maxim; Gulhan, Doga Can; Iiyama, Yutaro; Innocenti, Gian Michele; Klute, Markus; Kovalskyi, Dmytro; Lai, Yue Shi; Lee, Yen-Jie; Levin, Andrew Michael; Marini, Andrea Carlo; McGinn, Christopher Francis; Mironov, Camelia Maria; Niu, Xinmei; Paus, Christoph M. E.; Ralph, Duncan Kelley; Salfeld-Nebgen, Jakob Maxillia; Stephans, George S. F.; Velicanu, Dragos Alexandru; Veverka, Jan; Wang, J.; Wang, Ta-Wei; Wyslouch, Boleslaw; Yang, Mingming; Sumorok, Konstanty C; Varma, Mukund Madhav; Wyslouch, Victoria; Luckey Jr, P David; Roland, Christof E; Roland, Gunther M; ... Show more Show less
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Abstract
A search for fermionic top quark partners T of charge 2/3 is presented. The search is carried out in proton-proton collisions corresponding to an integrated luminosity of 19.7  fb[superscript −1] collected at a center-of-mass energy of √s = 8  TeV with the CMS detector at the LHC. The T quarks are assumed to be produced strongly in pairs and can decay into tH, tZ, and bW. The search is performed in five exclusive channels: a single-lepton channel, a multilepton channel, two all-hadronic channels optimized either for the bW or the tH decay, and one channel in which the Higgs boson decays into two photons. The results are found to be compatible with the standard model expectations in all the investigated final states. A statistical combination of these results is performed and lower limits on the T quark mass are set. Depending on the branching fractions, lower mass limits between 720 and 920 GeV at 95% confidence level are found. These are among the strongest limits on vectorlike T quarks obtained to date.
Date issued
2016-01
URI
http://hdl.handle.net/1721.1/101632
Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science
Journal
Physical Review D
Publisher
American Physical Society
Citation
Khachatryan, V., A. M. Sirunyan, A. Tumasyan, W. Adam, E. Asilar, T. Bergauer, J. Brandstetter, et al. “Search for Vectorlike Charge 2/3T Quarks in Proton-Proton Collisions at √(s) = 8 TeV.” Phys. Rev. D 93, no. 1 (January 19, 2016). © 2016 CERN, for the CMS Collaboration
Version: Final published version
ISSN
2470-0010
2470-0029

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