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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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Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2018
Deposited On:15 Feb 2019 10:53
Last Modified:24 Sep 2019 23:59
Publisher:Springer
ISSN:1029-8479
OA Status:Gold
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1007/JHEP04(2018)033

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