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

4 Laboratoire de Physique Corpusculaire
LPC - Laboratoire de Physique Corpusculaire - Clermont-Ferrand
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 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.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00681364
Contributor : Emmanuelle Vernay <>
Submitted on : Wednesday, March 21, 2012 - 12:27:15 PM
Last modification on : Wednesday, September 16, 2020 - 4:25:16 PM

### Citation

G. Aad, S. Albrand, M.L. Andrieux, Q. Buat, B. Clement, et al.. Measurement of the charge asymmetry in top quark pair production in pp collisions at sqrt(s) = 7 TeV using the ATLAS detector. European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2012, 72, pp.2039. ⟨10.1140/epjc/s10052-012-2039-5⟩. ⟨in2p3-00681364⟩

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