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 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 to tau tau decays are exploited to constrain the effective CP mixing angle alpha(H tau tau), which parameterizes the admixture of scalar and pseudoscalar couplings. The mixing angle is measured to be (36 +33 -30) degrees, compared with an expected value of (0 +/- 19) degrees under the standard model hypothesis. When combined with the previous CMS measurement using data collected at sqrt(s) = 13 TeV, corresponding to an integrated luminosity of 138 fb^-1, the mixing angle is determined to be (7 +/- 16) degrees, with an expected value of (0 +/- 14) degrees. 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.

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 / Null, N., Gevorgyan, A., Hayrapetyan, A., Makarenko, V., Tumasyan, A., Adam, W., Benato, L., Bergauer, T., Dragicevic, M., Gundacker, S., Guven, A.K., Hussain, P.S., Jeitler, M., Krammer, N., Li, A., Liko, D., Matthewman, M., Schieck, J., Schöfbeck, R., Shooshtari, M., et al.. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1029-8479. - 2026:10(2026 Oct). [10.1007/jhep10(2026)084]

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

Akrap, P.;Cunqueiro Mendez, L.;De Riggi, F.;Del Re, D.;Del Vecchio, M.;Di Marco, E.;Frosina, L.;Gargiulo, R.;Harikrishnan, B.;Lombardi, F.;Martikainen, L.;Organtini, G.;Palmeri, N.;Paramatti, R.;Pauletto, T.;Rahatlou, S.;Santanastasio, F.;Vladimirov, V.;
2026

Abstract

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 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 to tau tau decays are exploited to constrain the effective CP mixing angle alpha(H tau tau), which parameterizes the admixture of scalar and pseudoscalar couplings. The mixing angle is measured to be (36 +33 -30) degrees, compared with an expected value of (0 +/- 19) degrees under the standard model hypothesis. When combined with the previous CMS measurement using data collected at sqrt(s) = 13 TeV, corresponding to an integrated luminosity of 138 fb^-1, the mixing angle is determined to be (7 +/- 16) degrees, with an expected value of (0 +/- 14) degrees. 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.
2026-10
CP Violation; Hadron-Hadron Scattering; Higgs Physics; Tau Physics
01 Pubblicazione su rivista::01a Articolo in rivista
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 / Null, N., Gevorgyan, A., Hayrapetyan, A., Makarenko, V., Tumasyan, A., Adam, W., Benato, L., Bergauer, T., Dragicevic, M., Gundacker, S., Guven, A.K., Hussain, P.S., Jeitler, M., Krammer, N., Li, A., Liko, D., Matthewman, M., Schieck, J., Schöfbeck, R., Shooshtari, M., et al.. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1029-8479. - 2026:10(2026 Oct). [10.1007/jhep10(2026)084]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1779871
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