SMuK 2023 – scientific programme

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T: Fachverband Teilchenphysik

T 61: Higgs I

T 61.5: Talk

Wednesday, March 22, 2023, 16:50–17:05, HSZ/0204

Higgs Boson Cross Section Measurement in the H → ZZ → 4ℓ Channel with Early Run 3 ATLAS Data — •Alice Reed and Sandra Kortner — Max Planck Institut für Physik, München

Run 3 of the LHC began in July 2022, starting a new period of data taking at a higher centre of mass energy of 13.6 TeV, compared to 13.0 TeV during Run 2. At this higher center of mass energy, the Higgs boson cross section is expected to increase by ∼ 7% compared to Run 2.

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 e⁺e⁻ pair, H → ZZ → 4ℓ. Due to its clear signature, this decay channel can already be studied with early Run 3 data. The precision of the fiducial and differential H → 4ℓ cross section measurements was studied and optimized in preparation for the measurements with early Run 3 data from the ATLAS experiment.