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T: Fachverband Teilchenphysik

T 11: Higgs: bosonic decays and quantum numbers

T 11.5: Vortrag

Montag, 30. März 2020, 17:30–17:45, H-HS XII

Measurement of the Higgs boson CP quantum number in tautau decays with the CMS experiment — •Oleg Filatov, Elisabetta Gallo, Alexei Raspereza, Andrea Cardini, and Merijn van de Klundert — Deutsches Elektronen-Synchrotron (DESY)

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->tautau 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 tau leptons are reconstructed using the decay products in the mutau channel and the angle between them is used to estimate the CP mixing angle. The Run 2 data collected by the CMS experiment in proton-proton collisions at the LHC are used to estimate the sensitivity of the CP measurement.