Aachen 2019 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 76: Higgs-Zerfälle in Bosonen

T 76.3: Vortrag

Donnerstag, 28. März 2019, 16:30–16:45, H04

Measurement of the Higgs boson CP quantum number in τ τ decays — •Andrea Cardini, Elisabetta Gallo, Mareike Meyer, Teresa Lenz, Alexei Raspereza, and Merijn van de Klundert — Deutsches Elektronen-Synchrotron (DESY), Hamburg

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 that analysis is not sensitive to the possibility of a mixing angle between a CP-even and a CP-odd state.

The H→ 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 the decay products in the µτ_h channel and the angle between them is used to estimate the CP mixing angle.

The 2017 data collected by the CMS experiment in proton-proton collisions at the LHC are used to estimate the sensitivity of the CP measurement.