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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

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Article number2039
<mark>Journal publication date</mark>06/2012
<mark>Journal</mark>European Physical Journal C: Particles and Fields
Issue number6
Volume72
Number of pages27
Publication statusPublished
Original languageEnglish

Abstract

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 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 tt¯ 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 AC=−0.019±0.028 (stat.)±0.024 (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 are also shown.

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This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author(s) and the source are credited.