Tumasyan, A.Işıldak, Bora2023-06-222023-06-222022-06-031029-8479http://hdl.handle.net/10679/8464https://doi.org/10.1007/JHEP06(2022)012The first measurement of the CP structure of the Yukawa coupling between the Higgs boson and τ leptons is presented. The measurement is based on data collected in proton-proton collisions at s = 13 TeV by the CMS detector at the LHC, corresponding to an integrated luminosity of 137 fb−1. The analysis uses the angular correlation between the decay planes of τ leptons produced in Higgs boson decays. The effective mixing angle between CP-even and CP-odd τ Yukawa couplings is found to be −1 ± 19°, compared to an expected value of 0 ± 21° at the 68.3% confidence level. The data disfavour the pure CP-odd scenario at 3.0 standard deviations. The results are compatible with predictions for the standard model Higgs boson.engAttribution 4.0 InternationalopenAccesshttp://creativecommons.org/licenses/by/4.0/article2022600080750120000110.1007/JHEP06(2022)012Hadron-hadron scatteringHiggs physicsTau physics2-s2.0-85132110498