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Measurement of the charge asymmetry in top-quark pair production in proton–proton collisions at √s = 7 TeV

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, Christoph M. E.; Ralph, Duncan Kelley; Rudolph, Matthew Scott; Stephans, George S. F.; Sung, Kevin Kai Hong; Velicanu, Dragos Alexandru; Wenger, Edward Allen; Wyslouch, Boleslaw; Yilmaz, Yetkin; Yoon, A. S.; Zanetti, Marco; Alver, Burak Han; Lee, Yen-Jie; Luckey Jr, P David; Roland, Gunther M; Sumorok, Konstanty C; Wolf, Roger; Xie, Si; Bauer, Gerry P; Dutta, Valentina; Harris, Philip Coleman; Roland, Christof E; Stoeckli, Fabian; Yang, Mingming; ... Show more Show less
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Abstract
The difference in angular distributions between top quarks and antiquarks, commonly referred to as the charge asymmetry, is measured in pp collisions at the LHC with the CMS experiment. The data sample corresponds to an integrated luminosity of 1.09 fb[superscript −1] at a centre-of-mass energy of 7 TeV. Top-quark pairs are selected in the final state with an electron or muon and four or more jets. At least one jet is identified as originating from b-quark hadronization. The charge asymmetry is measured in two variables, one based on the pseudorapidities (η) of the top quarks and the other on their rapidities (y). The results A[η over C] = −0.017 ± 0.032 (stat.)[+0.025 over −0.036] (syst.) and A[y over C] = −0.013 ± 0.028 (stat.)[+0.029 over −0.031] (syst.) are consistent within uncertainties with the standard-model predictions.
Date issued
2012-02
URI
http://hdl.handle.net/1721.1/91926
Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science; Massachusetts Institute of Technology. School of Science
Journal
Physics Letters B
Publisher
Elsevier
Citation
Chatrchyan, S., V. Khachatryan, A.M. Sirunyan, A. Tumasyan, W. Adam, T. Bergauer, M. Dragicevic, et al. “Measurement of the Charge Asymmetry in Top-Quark Pair Production in Proton–proton Collisions at √s = 7 TeV.” Physics Letters B 709, no. 1–2 (March 2012): 28–49. © 2012 CERN
Version: Final published version
ISSN
03702693

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