Dortmund 2021 – scientific programme

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T: Fachverband Teilchenphysik

T 84: Associated Higgs production and Higgs quantum numbers II

T 84.9: Talk

Thursday, March 18, 2021, 18:00–18:15, Ti

Analysis of the CP structure of the Higgs boson in ττ decays — Andrea Cardini, •Oleg Filatov, Elisabetta Gallo, Alexei Raspereza, and Merijn van de Klundert — Deutsches Elektronen-Synchrotron (DESY), Hamburg, Germany

The Standard Model (SM) predicts the existence of a CP-even Higgs boson. Measuring the CP quantum number of the Higgs boson is therefore useful to confirm the prediction of the SM and search for evidences pointing to new physics. The study of bosonic decays of the Higgs boson has already excluded a CP odd Higgs, however direct measurement of a mixing angle between a CP-even and a CP-odd state has not been performed yet.

The H to ττ decay at tree level is sensitive to the CP parity of the Higgs boson and offers a possible measurement of the CP mixing angle. The decay planes of the two τ leptons are reconstructed using their decay products and the corresponding acoplanarity angle between the planes is used to estimate the CP mixing angle.

We present the first measurement of the CP structure of the Yukawa coupling between Higgs boson and τ leptons. The measurement is based on Run II data corresponding to an integrated luminosity of 137 fb^{-1} and collected by the CMS experiment in proton-proton collisions at the LHC.