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EDP Sciences, EPJ Web of Conferences, (28), p. 12046

DOI: 10.1051/epjconf/20122812046

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Measurement of the charge asymmetry in top quark pair production in pp collisions at √s=7 TeV using the ATLAS detector

Journal article published in 2016 by M. Zur Nedden, G. N. Taylor, W. Taylor, J. Wang, R. Wang, S. M. Wang, C. Via, H. Torre, J. B. Vivie De Regie, D. Volpe, Z. Yang, M. A. B. Vale, A. Valle Wemans, C. Taille, Do Vale and other authors.
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

See paper for full list of authors - 15 pages plus cover page plus author list (30 pages total), 6 figures, 3 tables, submitted to European Physical Journal C ; A measurement of the top-antitop production charge asymmetry A_C is presented using data corresponding to an integrated luminosity of 1.04 fb^-1 of pp collisions at sqrt(s) = 7 TeV collected by the ATLAS detector at the LHC. Events are selected with a single lepton (electron or muon), missing transverse momentum and at least four jets of which at least one jet is identified as coming from a b-quark. A kinematic fit is used to reconstruct the ttbar event topology. After background subtraction, a Bayesian unfolding procedure is performed to correct for acceptance and detector effects. The measured value of A_C is A_C = -0.018 +/- 0.028 (stat.) +/- 0.023 (syst.), consistent with the prediction from the MC@NLO Monte Carlo generator of A_C = 0.006 +/- 0.002. Measurements of A_C in two ranges of invariant mass of the top-antitop pair is also shown.