Analysis of the CP structure of the Yukawa coupling between the Higgs boson and tau leptons in proton-proton collisions at $$ sqrt{s}=13.6 $$ TeV | CU Experts

; A; bstract; ; ; This paper presents a measurement of the charge-parity (; CP; ) structure of the Yukawa coupling between the Higgs boson (H) and tau leptons, using proton-proton collision data at; ; ; $$ sqrt{s}=13.6 $$; ; ; s; ; =; 13.6; ; ; ; TeV recorded with the CMS detector at the LHC, corresponding to an integrated luminosity of 62.4 fb; ; −; 1; ; . Angular correlations between the decay products of tau leptons produced in H →; ττ; decays are exploited to constrain the effective; CP; mixing angle; α; ; H; ττ; ; , which parameterizes the admixture of scalar and pseudoscalar couplings. The mixing angle is measured to be; ; ; $$ {alpha}^{mathrm{H}tau tau}={left({36}_{-30}^{+33}right)}^{{}^{circ}} $$; ; ; α; ; H; ττ; ; ; =; ; ; ; 36; ; −; 30; ; ; +; 33; ; ; ; °; ; ; ; ; , compared with an expected value of (0 ± 19); ; °; ; under the standard model hypothesis. When combined with the previous CMS measurement using data collected at; ; ; $$ sqrt{s}=13 $$; ; ; s; ; =; 13; ; ; ; TeV, corresponding to an integrated luminosity of 138 fb; ; −; 1; ; , the mixing angle is determined to be (7 ± 16); ; °; ; , with an expected value of (0 ± 14); ; °; ; . This result represents the most precise measurement by CMS of the; CP; nature of the Higgs boson coupling to tau leptons, with an expected precision that is the best achieved by any experiment to date.;

Gevorgyan A; Hayrapetyan A; Makarenko V; Tumasyan A; Adam W; Benato L; Bergauer T; Dragicevic M; Gundacker S; Guven AK

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