Combination of inclusive and differential $t\overline t$ charge asymmetry measurements using ATLAS and CMS data at $\sqrt s$ = 7 and 8 TeV

Abstract

This paper presents combinations of inclusive and differential measurements of the charge asymmetry $(A_C)$ in top quark pair $(t\bar{t})$ events with a lepton+jets signature by the ATLAS and CMS Collaborations, using data from LHC proton-proton collisions at centre-of-mass energies of 7 and 8 TeV. The data correspond to integrated luminosities of about 5 and 20 $fb^{−1}$ for each experiment, respectively. The resulting combined LHC measurements of the inclusive charge asymmetry are $A_C^{CHC7}$ = 0.005 ± 0.007 (stat) ± 0.006(syst) at 7 TeV and $A_C^{CH8}$  = 0.0055 ± 0.0023 (stat) ± 0.0025 (syst) at 8 TeV. These values, as well as the combination of $A_C$ measurements as a function of the invariant mass of the $(t\bar{t}$) system at 8 TeV, are consistent with the respective standard model predictions.

Abstract

This paper presents combinations of inclusive and differential measurements of the charge asymmetry $(A_C)$ in top quark pair $(t\bar{t})$ events with a lepton+jets signature by the ATLAS and CMS Collaborations, using data from LHC proton-proton collisions at centre-of-mass energies of 7 and 8 TeV. The data correspond to integrated luminosities of about 5 and 20 $fb^{−1}$ for each experiment, respectively. The resulting combined LHC measurements of the inclusive charge asymmetry are $A_C^{CHC7}$ = 0.005 ± 0.007 (stat) ± 0.006(syst) at 7 TeV and $A_C^{CH8}$  = 0.0055 ± 0.0023 (stat) ± 0.0025 (syst) at 8 TeV. These values, as well as the combination of $A_C$ measurements as a function of the invariant mass of the $(t\bar{t}$) system at 8 TeV, are consistent with the respective standard model predictions.

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