Analysis of the CP structure of the Yukawa coupling between the Higgs boson and $\tau$ leptons in proton-proton collisions at $\sqrt{s}=$ 13 TeV

Abstract

The first measurement of the CP structure of the Yukawa coupling between the Higgs boson and $\tau$ leptons is presented. The measurement is based on data collected in proton-proton collisions at $\sqrt{s}=$ 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 $\tau$ leptons produced in Higgs boson decays. The effective mixing angle between CP-even and CP-odd $\tau$ Yukawa couplings is found to be $-$1 $\pm$ 19${}^{\circ }$, compared to an expected value of 0 $\pm$ 21${}^{\circ }$ 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.

Replaced with the published version. Added the journal reference and the DOI. All the figures and tables, including additional supplemental figures and tables, can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/HIG-20-006 (CMS Public Pages)

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