This paper presents combinations of inclusive and differential measurements of the charge asymmetry (A_C) in top quark pair (ttbar) 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^CHC8 = 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 ttbar system at 8 TeV, are consistent with the respective standard model predictions.
Combination of inclusive and differential ttbar charge asymmetry measurements using ATLAS and CMS data at √s = 7 and 8 TeV
Ravera, F.;Amapane, N.;Argiro, S.;Bellan, R.;Costa, M.;Covarelli, R.;Kiani, B.;Migliore, E.;Monaco, V.;Monteil, E.;Obertino, M. M.;Pacher, L.;Pinna Angioni, G. L.;Romero, A.;Sacchi, R.;Sola, V.;Solano, A.;Rumerio, P.;
2018-01-01
Abstract
This paper presents combinations of inclusive and differential measurements of the charge asymmetry (A_C) in top quark pair (ttbar) 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^CHC8 = 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 ttbar system at 8 TeV, are consistent with the respective standard model predictions.File | Dimensione | Formato | |
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