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A bstract CP ) structure of the Yukawa interaction between the Higgs (H) boson and the top quark is measured in a data sample enriched in the t H and tH associated production, using 138 fb$$ \overline{\textrm{t}} $$ − 1of data collected in proton-proton collisions at = 13 TeV by the CMS experiment at the CERN LHC. The study targets events where the H boson decays via H → WW or H →$$ \sqrt{s} $$ ττ and the top quarks decay via t → Wb: the W bosons decay either leptonically or hadronically, and final states characterized by the presence of at least two leptons are studied. Machine learning techniques are applied to these final states to enhance the separation ofCP -even fromCP -odd scenarios. Two-dimensional confidence regions are set onκ tand t, which are respectively defined as the$$ \overset{\sim }{\kappa } $$ CP -even andCP -odd top-Higgs Yukawa coupling modifiers. No significant fractionalCP -odd contributions, parameterized by the quantity| $$ {f}_{CP}^{\textrm{Htt}} $$ | are observed; the parameter is determined to be| $$ {f}_{CP}^{\textrm{Htt}} $$ | = 0. 59 with an interval of (0. 24, 0. 81) at 68% confidence level. The results are combined with previous results covering the H→ ZZ and H→ γγ decay modes, yielding two- and one-dimensional confidence regions onκ tand t, while$$ \overset{\sim }{\kappa } $$ | $$ {f}_{CP}^{\textrm{Htt}} $$ | is determined to be| $$ {f}_{CP}^{\textrm{Htt}} $$ | = 0. 28 with an interval of| $$ {f}_{CP}^{\textrm{Htt}} $$ | < 0. 55 at 68% confidence level, in agreement with the standard modelCP -even prediction of| $$ {f}_{CP}^{\textrm{Htt}} $$ | = 0.Free, publicly-accessible full text available July 1, 2024 -
Khachatryan, V. ; Sirunyan, A. M. ; Tumasyan, A. ; Adam, W. ; Bergauer, T. ; Dragicevic, M. ; Erö, J. ; Friedl, M. ; Frühwirth, R. ; Ghete, V. M. ; et al ( , Physical Review D)