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Scientific article
English

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

ContributorsATLAS Collaboration
Published inEuropean physical journal. C, Particles and fields, vol. 72, no. 2039, 27
Publication date2012
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.

Citation (ISO format)
ATLAS Collaboration. Measurement of the charge asymmetry in top quark pair production in <em>pp</em> collisions at √s=7 TeV using the ATLAS detector. In: European physical journal. C, Particles and fields, 2012, vol. 72, n° 2039, p. 27. doi: 10.1140/epjc/s10052-012-2039-5
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Article (Published version)
accessLevelRestricted
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ISSN of the journal1434-6044
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