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T: Fachverband Teilchenphysik

T 61: Higgs Boson: Decay in Bosons

T 61.1: Vortrag

Mittwoch, 23. März 2022, 16:15–16:30, T-H20

Effective Field Theory interpretation of the pp→ H → 4ℓ Higgs boson decay measurements with the ATLAS detector — •Alice Reed, Sandra Kortner, and Hubert Kroha — Max Planck Institut für Physik (Werner-Heisenberg-Institut), München

An important process for the measurement of the Higgs boson properties is the Higgs boson decay into two Z bosons, which subsequently decay into a µ⁺µ⁻ or an e⁺e⁻ pair, pp → H → 4ℓ. In the Standard Model (SM), the Higgs boson is predicted to be a spin-0 particle with a positive CP quantum number. This hypothesis is also favoured by the Run-1 data at the LHC. Still, small admixtures of anomalous and possibly also CP-violating couplings with non-SM tensor structure are not yet excluded.

Such deviations from the SM can be described within the effective field theory (EFT) framework in which the SM is extended by the addition of higher-dimensional operators. In this talk, the EFT interpretation of the measured Higgs boson properties in the 4-lepton decay channel is presented, allowing constraints on several EFT parameters to be determined. Particular emphasis is given to the impact of the these EFT parameters on the acceptance of the four-lepton event selection criteria, which needs to be taken into account in addition to the EFT effects on the production cross section and branching ratio.