Speaker
Description
Despite the many successes of the Standard Model (SM), it is known to be incomplete, for instance, it does not provide an explanation for the observed baryon asymmetry of the universe. One of the necessary conditions to generate this asymmetry is charge-parity (CP) violation on a scale many orders of magnitude larger than SM predictions. An intriguing possibility is new sources of CP violation in the Higgs sector, for example in the Yukawa couplings to fermions. I will present the latest measurement of the CP structure of the Higgs to tau lepton coupling by CMS, using proton-proton collision data collected at a centre of mass energy of 13.6 TeV, corresponding to an integrated luminosity of 62.4/fb. Angular correlations between the decay products of tau leptons produced in Higgs to TauTau decays are exploited to constrain the effective CP mixing angle alpha. The sensitivity achieved is comparable to the CMS result at 13 TeV, despite using less than half the amount of data. The result is then combined with the previous measurement, and represents the most sensitive measurement to date of the CP properties of the Higgs boson coupling to tau leptons.