## 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 language English Aad:2015jfa 061 Journal of High Energy Physics 1505 10.1007/JHEP05(2015)061 Published - 12 May 2015

### Abstract

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 ${A}_{\mathrm{C}}^{\ell \ell }=0.024\pm 0.015\left(\mathrm{stat}.\right)\pm 0.009\left(\mathrm{syst}.\right),$ ${A}_{\mathrm{C}}^{t\overline{t}}=0.021\pm 0.025\left(\mathrm{stat}.\right)\pm 0.017\left(\mathrm{syst}.\right).$