Search for CP violation using $\mathrm{t\bar{t}}$ events in the lepton+jets channel in pp collisions at $\sqrt{s}$ = 13 TeV

The CMS collaboration
JHEP 06 (2023) 081, 2023.

Abstract
Results are presented on a search for CP violation in the production and decay of top quark-antiquark pairs in the lepton+jets channel. The search is based on data from proton-proton collisions at 13 TeV, collected with the CMS detector, corresponding to an integrated luminosity of 138 fb$^{-1}$. Possible CP violation effects are evaluated by measuring uncorrected asymmetries in observables constructed from linearly independent four-momentum vectors of the final-state particles. The dimensionless chromoelectric dipole moment of the top quark obtained from the observed asymmetries is measured to be 0.04 $\pm$ 0.10 (stat) $\pm$ 0.07 (syst), and the asymmetries exhibit no evidence for CP-violating effects, consistent with expectations from the standard model.

  • Effective asymmetries A'_{CP} measurement

    data from Figure 6

    10.17182/hepdata.114781.v1/t1

    Results for the measurement of the effective asymmetries for each observable for the separate electron and muon channels, as well...

  • Dimensionless CEDM d_{tG} measurement

    data from Figure 7

    10.17182/hepdata.114781.v1/t2

    Results for the measurement of the dimensionless CEDM for each observable and the combined lepton+jets channel.

  • CP-violating asymmetries A_{CP} measurement

    data from Table 7

    10.17182/hepdata.114781.v1/t3

    Results for the measurement of the CP-violating asymmetries for each observable for the combined lepton+jets channel.

  • Covariance matrix

    data from Equation 12

    10.17182/hepdata.114781.v1/t4

    Results for the covariance matrix where the parameters a, b, c, and d are taken from a linear fit to...

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