Search for CP violation in the tau Yukawa coupling with CMS

The proceedings present a measurement of the charge-parity (CP) properties of the Higgs boson in its coupling to tau leptons. To date, all measurements of its interactions with fermions and bosons are consistent with the standard model prediction of a purely scalar neutral Higgs boson nature and exclude the purely pseudo-scalar scenario. However an admixture of both CP-even and CP-odd states is still possible. In the presented analysis, the pure pseudo-scalar hypothesis is excluded at 3.0$\sigma$ in its coupling to the tau lepton with a measured CP mixing angle value $\alpha^{H\tau\tau}=-1\pm19^\circ$ at 68.3\% CL. Some prospects in future LHC operations are also presented.