Combination of inclusive and differential $\mathrm{t}\overline{\mathrm{t}}$ 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 ($A_{\mathrm{C}}$) in top quark pair ($\mathrm{t}\overline{\mathrm{t}}$) 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 corresponding 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 $A_{\mathrm{C}}^{LHC7}=0.005\pm 0.007\text{ (stat)}\pm 0.006\text{ (syst)}$ at 7 TeV and $A_{\mathrm{C}}^{LHC8}=0.0055\pm 0.0023\text{ (stat)}\pm 0.0025\text{ (syst)}$ at 8 TeV. These values, as well as the combination of $A_{\mathrm{C}}$ measurements as a function of the invariant mass of the $\mathrm{t}\overline{\mathrm{t}}$ system at 8 TeV, are consistent with the respective standard model predictions.

arXiv commentReplaced with the published version. Figures and tables can be found at <url>http://cms-results.web.cern.ch/cms-results/public-results/publications/TOP-15-016</url> (CMS Public Pages) and https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/TOPQ-2016-16 (ATLAS pages)