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Search for Z[superscript ′] resonances decaying to tt̅ in dilepton+jets final states in pp collisions at √s=7  TeV

Author(s)
Apyan, Aram; Bendavid, Joshua L.; Busza, Wit; Butz, Erik M.; Cali, Ivan Amos; Chan, M.; Gomez-Ceballos, Guillelmo; Goncharov, Maxim; Kim, Y.; Klute, Markus; Krajczar, Krisztian F.; Ma, Teng; Nahn, Steven; Paus, Christoph M. E.; Ralph, Duncan Kelley; Stephans, George S. F.; Sung, Kevin Kai Hong; Velicanu, Dragos Alexandru; Wenger, Edward Allen; Wyslouch, Boleslaw; Yilmaz, Yetkin; Zanetti, Marco; Bauer, Gerry P; Dutta, Valentina; Levin, Andrew Michael; Roland, Christof E; Rudolph, Matthew Scott; Stoeckli, Fabian; Luckey Jr, P David; Roland, Gunther M; Sumorok, Konstanty C; Wolf, Roger; Yang, Mingming; Yoon, A. S.; Wyslouch, Victoria; ... Show more Show less
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Abstract
A search for resonances decaying to top quark-antiquark pairs is performed using a dilepton+jets data sample recorded by the CMS experiment at the LHC in pp collisions at √s=7  TeV corresponding to an integrated luminosity of 5.0  fb[superscript -1]. No significant deviations from the standard model background are observed. Upper limits are presented for the production cross section times branching fraction of top quark-antiquark resonances for masses from 750 to 3000 GeV. In particular, the existence of a leptophobic topcolor particle Z[superscript ′] is excluded at the 95% confidence level for resonance masses M[subscript Z]′<1.3  TeV for Γ[subscript Z]′=0.012M[subscript Z]′, and M<1.9  TeV for Γ[subscript Z]′=0.10M[subscript Z]′.
Date issued
2013-04
URI
http://hdl.handle.net/1721.1/79663
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 D
Publisher
American Physical Society
Citation
Chatrchyan, S., V. Khachatryan, A. M. Sirunyan, A. Tumasyan, W. Adam, E. Aguilo, T. Bergauer, et al. “Search for Z^{′} resonances decaying to tt[over ¯] in dilepton+jets final states in pp collisions at sqrt[s]=7  TeV.” Physical Review D 87, no. 7 (April 2013). © 2013 CERN, for the CMS Collaboration
Version: Final published version
ISSN
1550-7998
1089-4918

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