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The CMS experiment at the LHC has performed the first measurement of the CPstructure of the Yukawa coupling between the Higgs boson and tau leptons. Themeasurement is based on data collected in proton-proton collisions at $\sqrt{s}= 13$ TeV during 2016-18, corresponding to an integrated luminosity of$137\text{ fb}^{-1}$. The analysis utilizes the angular correlation between thedecay planes of tau leptons produced in Higgs boson decays, where dedicatedanalysis techniques are used to optimise the reconstruction of tau decayplanes. The measured value of the CP mixing angle is $4\pm17^{\circ}$, at$68\%$ confidence level. The pure $\textit{CP-}$odd hypothesis is excluded by$3.2$ standard deviations. The analysis strategies and the results of themeasurement are presented.

Measurement of the $\textit{CP}$ structure of the Higgs-tau Yukawa coupling