{"@context":"http://schema.org","@id":"https://doi.org/10.17182/hepdata.172938.v1","@reverse":{"isBasedOn":[{"@type":"ScholarlyArticle","identifier":{"@type":"PropertyValue","propertyID":"URL","value":"https://inspirehep.net/literature/3164943"}}]},"@type":"Dataset","additionalType":"Collection","author":{"@type":"Organization","name":"CMS Collaboration"},"creator":{"@type":"Organization","name":"CMS Collaboration"},"datePublished":"2026","description":"This paper presents a measurement of the charge-parity ($C\\!P$) 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$$\u03c4\u03c4$ decays are exploited to constrain the effective $C\\!P$ mixing angle $\u03b1^{\\mathrm{H}\u03c4\u03c4}$, which parameterizes the admixture of scalar and pseudoscalar couplings. The mixing angle is measured to be $\u03b1^{\\mathrm{H}\u03c4\u03c4}$ = (36$^{+33}_{-30}$)$^\\circ$, compared with an expected value of (0 $\\pm$ 19)$^\\circ$ 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 $\\pm$ 16)$^\\circ$, with an expected value of (0 $\\pm$ 14)$^\\circ$. This result represents the most precise measurement by CMS of the $C\\!P$ nature of the Higgs boson coupling to tau leptons, with an expected precision that is the best achieved by any experiment to date.","hasPart":[{"@id":"https://doi.org/10.17182/hepdata.172938.v1/t1","@type":"Dataset","description":"Genuine tau category BDT score distribution in the $\\tau_h\\tau_h$ channel.","name":"Figure 2a"},{"@id":"https://doi.org/10.17182/hepdata.172938.v1/t2","@type":"Dataset","description":"Mis-ID tau category BDT score distribution in the $\\tau_h\\tau_h$ channel.","name":"Figure 2b"},{"@id":"https://doi.org/10.17182/hepdata.172938.v1/t3","@type":"Dataset","description":"$\\phi_{CP}$ distribution in the $\\rho\\rho$ category in windows of increasing Higgs category BDT score.","name":"Figure 3a"},{"@id":"https://doi.org/10.17182/hepdata.172938.v1/t4","@type":"Dataset","description":"$\\phi_{CP}$ distribution in the $\\pi\\rho$ category in windows of increasing Higgs category BDT score.","name":"Figure 3b"},{"@id":"https://doi.org/10.17182/hepdata.172938.v1/t5","@type":"Dataset","description":"$\\phi_{CP}$ distribution in the $\\rho a_1^{3pr}$ category in windows of increasing Higgs category BDT score.","name":"Figure 3c"},{"@id":"https://doi.org/10.17182/hepdata.172938.v1/t6","@type":"Dataset","description":"Observed negative log-likelihood scan of $\\alpha^{\\mathrm{H}\\tau\\tau}$ for the $\\sqrt{s}=13.6$ TeV data set.","name":"Figure 4 Observed"},{"@id":"https://doi.org/10.17182/hepdata.172938.v1/t7","@type":"Dataset","description":"Expected negative log-likelihood scan of $\\alpha^{\\mathrm{H}\\tau\\tau}$ for the $\\sqrt{s}=13.6$ TeV data set.","name":"Figure 4 Expected"},{"@id":"https://doi.org/10.17182/hepdata.172938.v1/t8","@type":"Dataset","description":"Observed negative log-likelihood scan of $\\alpha^{\\mathrm{H}\\tau\\tau}$ for the $\\sqrt{s}=13$ and $\\sqrt{s}=13.6$ TeV data sets.","name":"Figure 5 Observed"},{"@id":"https://doi.org/10.17182/hepdata.172938.v1/t9","@type":"Dataset","description":"Expected negative log-likelihood scan of $\\alpha^{\\mathrm{H}\\tau\\tau}$ for the $\\sqrt{s}=13$ and $\\sqrt{s}=13.6$ TeV data sets.","name":"Figure 5 Expected"},{"@id":"https://doi.org/10.17182/hepdata.172938.v1/t10","@type":"Dataset","description":"Weighted $\\phi_{CP}$ distributions for the $\\sqrt{s}=13.6$ TeV data set, shown for signal (SM, pseudoscalar, maximal mixing), background, and observed data.","name":"Figure 6a"},{"@id":"https://doi.org/10.17182/hepdata.172938.v1/t11","@type":"Dataset","description":"Weighted $\\phi_{CP}$ distributions for the $\\sqrt{s}=13$ and $\\sqrt{s}=13.6$ TeV data sets, shown for signal (SM, pseudoscalar, maximal mixing), background, and...","name":"Figure 6b"},{"@id":"https://doi.org/10.17182/hepdata.172938.v1/t12","@type":"Dataset","description":"Observed negative log-likelihood scan in the ($\\alpha^{\\mathrm{H}\\tau\\tau}$, $\\mu$) plane for the $\\sqrt{s}=13$ and $\\sqrt{s}=13.6$ TeV data sets.","name":"Figure 7"},{"@id":"https://doi.org/10.17182/hepdata.172938.v1/t13","@type":"Dataset","description":"Observed negative log-likelihood scan in the (${\\kappa}_\\tau$, $\\tilde{\\kappa}_\\tau$) plane for the $\\sqrt{s}=13$ and $\\sqrt{s}=13.6$ TeV data sets.","name":"Figure 8"},{"@id":"https://doi.org/10.17182/hepdata.172938.v1/t14","@type":"Dataset","description":"Expected negative log-likelihood scan of $\\alpha^{\\mathrm{H}\\tau\\tau}$ for the projection to the end of the High-Luminosity LHC, with statistical uncertainties only...","name":"Figure 9"},{"@id":"https://doi.org/10.17182/hepdata.172938.v1/t15","@type":"Dataset","description":"Observed negative log-likelihood scan in the ($\\mu_\\mathrm{ggH}$, $\\mu_\\mathrm{qqH}$) plane for the $\\sqrt{s}=13.6$ TeV data set.","name":"Auxillary Figure 1"},{"@id":"https://doi.org/10.17182/hepdata.172938.v1/t16","@type":"Dataset","description":"Correlation matrix for the parameters $\\alpha^{\\mathrm{H}\\tau\\tau}$, $\\mu_\\mathrm{qqH}$, and $\\mu_\\mathrm{ggH}$ from the fit to the $\\sqrt{s}=13.6$ TeV data set. The best...","name":"Auxillary Figure 2"},{"@id":"https://doi.org/10.17182/hepdata.172938.v1/t17","@type":"Dataset","description":"Observed negative log-likelihood scan in the ($\\mu_\\mathrm{ggH}$, $\\mu_\\mathrm{qqH}$) plane for the $\\sqrt{s}=13$ and $\\sqrt{s}=13.6$ TeV data sets.","name":"Auxillary Figure 3"},{"@id":"https://doi.org/10.17182/hepdata.172938.v1/t18","@type":"Dataset","description":"Correlation matrix for the parameters $\\alpha^{\\mathrm{H}\\tau\\tau}$, $\\mu_\\mathrm{qqH}$, and $\\mu_\\mathrm{ggH}$ from the fit to the $\\sqrt{s}=13$ and $\\sqrt{s}=13.6$ TeV data sets....","name":"Auxillary Figure 4"}],"identifier":[{"@type":"PropertyValue","propertyID":"HEPDataRecord","value":"https://www.hepdata.net/record/ins3164943?version=1"},{"@type":"PropertyValue","propertyID":"HEPDataRecordAlt","value":"https://www.hepdata.net/record/172938"}],"inLanguage":"en","name":"Analysis of the $C\\!P$ structure of the Yukawa coupling between the Higgs boson and tau leptons in proton-proton collisions at $\\sqrt{s}$ = 13.6 TeV","provider":{"@type":"Organization","name":"HEPData"},"publisher":{"@type":"Organization","name":"HEPData"},"url":"https://www.hepdata.net/record/ins3164943?version=1","version":1}