Search for pair production of excited top quarks in the lepton + jets final state
Author(s)
Apyan, Aram; Busza, Wit; Cali, Ivan Amos; Chan, M.; Di Matteo, Leonardo; Gomez-Ceballos, Guillelmo; Goncharov, Maxim; Gulhan, Doga Can; Kim, Y.; Klute, Markus; Lai, Yue Shi; Ma, Teng; Nahn, Steven; Paus, Christoph M. E.; Ralph, Duncan Kelley; Stephans, George S. F.; Velicanu, Dragos Alexandru; Wyslouch, Boleslaw; Yilmaz, Yetkin; Yoon, A. S.; Zanetti, Marco; Dutta, Valentina; Luckey Jr, P David; Roland, Gunther M; Stoeckli, Fabian; Bauer, Gerry P; Levin, Andrew Michael; Roland, Christof E; Sumorok, Konstanty C; Wolf, Roger; Yang, Mingming; Wyslouch, Victoria; ... Show more Show less
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A search is performed for pair-produced spin-3/2 excited top quarks (t[superscript ∗][¯ over t][superscript ∗]), each decaying to a top quark and a gluon. The search uses data collected with the CMS detector from pp collisions at a center-of-mass energy of √s = 8 TeV, selecting events that have a single isolated muon or electron, an imbalance in transverse momentum, and at least six jets, of which one must be compatible with originating from the fragmentation of a b quark. The data, corresponding to an integrated luminosity of 19.5 fb[superscript −1], show no significant excess over standard model predictions, and provide a lower limit of 803 GeV at 95% confidence on the mass of the spin-3/2 t* quark in an extension of the Randall-Sundrum model, assuming a 100% branching fraction of its decay into a top quark and a gluon. This is the first search for a spin-3/2 excited top quark performed at the LHC.
Date issued
2014-06Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science; Massachusetts Institute of Technology. School of ScienceJournal
Journal of High Energy Physics
Publisher
Springer-Verlag
Citation
Chatrchyan, S., V. Khachatryan, A. M. Sirunyan, A. Tumasyan, W. Adam, T. Bergauer, M. Dragicevic, et al. “Search for Pair Production of Excited Top Quarks in the Lepton + Jets Final State.” J. High Energ. Phys. 2014, no. 6 (June 2014). © CERN, for the benefit of the CMS Collaboration
Version: Final published version
ISSN
1029-8479
1126-6708