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Search for anomalous t[bar over t] production in the highly-boosted all-hadronic final state

Author(s)
Bendavid, Joshua L.; Busza, Wit; Butz, Erik M.; Cali, Ivan Amos; Chan, M.; Gomez-Ceballos, Guillelmo; Goncharov, Maxim; Hahn, Kristian Allan; Kim, Y.; Klute, Markus; Li, W.; Ma, Teng; Nahn, Steven; Paus, Cristoph M. E.; Ralph, Duncan Kelley; Roland, Cristof E.; Rudoph, M.; Stephans, George S. F.; Sung, Kevin Kai Hong; Velicanu, Dragos Alexandru; Wenger, Edward Allen; Wyslouch, Boleslaw; Yilmaz, Yetkin; Yoon, A. S.; Zanetti, Marco; Paus, Christoph M. E.; Lee, Yen-Jie; Luckey Jr, P David; Roland, Gunther M; Sumorok, Konstanty C; Wolf, Roger; Xie, Si; Roland, Christof E; Bauer, Gerry P; Dutta, Valentina; Stoeckli, Fabian; Yang, Mingming; Rudolph, Matthew Scott; ... Show more Show less
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Abstract
A search is presented for a massive particle, generically referred to as a Z′, decaying into a t[bar over t] pair. The search focuses on Z[superscript ′] resonances that are sufficiently massive to produce highly Lorentz-boosted top quarks, which yield collimated decay products that are partially or fully merged into single jets. The analysis uses new methods to analyze jet substructure, providing suppression of the non-top multijet backgrounds. The analysis is based on a data sample of proton-proton collisions at a center-of-mass energy of 7 TeV, corresponding to an integrated luminosity of 5 fb[superscript −1]. Upper limits in the range of 1 pb are set on the product of the production cross section and branching fraction for a topcolor Z′ modeled for several widths, as well as for a Randall-Sundrum Kaluza-Klein gluon. In addition, the result contrain any enhancement in t[bar over t] production beyond expectations of the standard mode for tt invariant mass larger than 1 TeV/c [superscript 2].
Date issued
2012-09
URI
http://hdl.handle.net/1721.1/86207
Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science; Massachusetts Institute of Technology. School of Science
Journal
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 Anomalous t[bar over t] Production in the Highly-Boosted All-Hadronic Final State.” J. High Energ. Phys. 2012, no. 9 (September 2012). © CERN, for the benefit of the CMS collaboration
Version: Final published version
ISSN
1029-8479
1126-6708

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