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Measurement of the charge asymmetry in dileptonic decays of top quark pairs in $pp$ collisions at $\sqrt{s}=7$ TeV using the ATLAS detector

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Original languageEnglish
Article numberAad:2015jfa
Pages (from-to)061
Journal Journal of High Energy Physics
Publication statusPublished - 12 May 2015


A measurement of the top-antitop $ \left(t\overline{t}\right) $ charge asymmetry is presented using data corresponding to an integrated luminosity of 4.6 fb$^{−1}$ of LHC pp collisions at a centreof-mass energy of 7 TeV collected by the ATLAS detector. Events with two charged leptons, at least two jets and large missing transverse momentum are selected. Two observables are studied: A$_{C}^{ℓℓ}$ based on the identified charged leptons, and $ {A}_{\mathrm{C}}^{t\overline{t}} $ , based on the reconstructed tt final state. The asymmetries are measured to be $ {A}_{\mathrm{C}}^{\ell \ell }=0.024\pm 0.015\left(\mathrm{stat}.\right)\pm 0.009\left(\mathrm{syst}.\right), $ $ {A}_{\mathrm{C}}^{t\overline{t}}=0.021\pm 0.025\left(\mathrm{stat}.\right)\pm 0.017\left(\mathrm{syst}.\right). $

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