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Measurement of the charge asymmetry in top-quark pair production in association with a photon with the ATLAS experiment

The ATLAS collaboration
Aad, Georges , Abbott, Braden Keim , Abbott, Dale , Abeling, Kira , Abidi, Haider , Aboulhorma, Asmaa , Abramowicz, Halina , Abreu, Henso , Abulaiti, Yiming , Abusleme, Angel
Phys.Lett.B 843 (2023) 137848, 2023.
https://doi.org/10.17182/hepdata.140834.v1

Abstract (data abstract)
CERN-LHC-ATLAS. A measurement of the charge asymmetry in top-quark pair (tt¯) production in association with a photon is presented. The measurement is performed in the single-lepton tt¯ decay channel using proton-proton collision data collected with the ATLAS detector at the Large Hadron Collider at CERN at a centre-of-mass-energy of 13 TeV during the years 2015-2018, corresponding to an integrated luminosity of 139 fb−1. The charge asymmetry is obtained from the distribution of the difference of the absolute rapidities of the top quark and antiquark using a profile likelihood unfolding approach. It is measured to be AC=−0.003±0.029 in agreement with the Standard Model expectation.

  • Table 1

    Data from Page 7 and 8

    10.17182/hepdata.140834.v1/t1

    The measured asymmetry of top quark pairs in tt¯γ production in a fiducial region at particle level.

  • Table 2

    Data from Figure 01 of the auxiliary material

    10.17182/hepdata.140834.v1/t2

    Normalised differential cross section as a function of |y(t)|−|y(t¯)|. The observed data is compared with the SM expectation...

  • Table 3

    10.17182/hepdata.140834.v1/t3

    Definition of the fiducial phase space at particle level. where, γ: photon ℓ: lepton j: jet

  • Table 4

    10.17182/hepdata.140834.v1/t4

    Correlation matrix of all the parameters including nuisance parameters used in the profile likelihood unfolding fit on AC.

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