Measurement of the charge asymmetry in dileptonic decays of top quark pairs in proton-proton collisions at 7 TeV using the ATLAS detector

2014/12/01 by Deterre, Cécile, Mijović, Liza
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex)

paper · doi:10.48550/arxiv.1412.0570

Abstract

A measurement of the top--antitop (tt) charge asymmetry is presented using 2011 LHC data collected by the ATLAS detector corresponding to an integrated luminosity of 4.6 fb^-1 at a centre-of-mass energy of 7 TeV. The analysis is performed in the dilepton channel, and two different observables are studied: A^ℓℓ_C, based on the identified charged leptons, and A^tt_C, based on the reconstructed tt final state. The asymmetries, measured to be A^ℓℓ_C = 0.024 ± 0.015 (stat.) ± 0.009 (syst.) and A^tt_C = 0.021 ± 0.025 (stat.) ± 0.017 (syst.), are in agreement with the Standard Model predictions.

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