Erlangen 2026 – scientific programme
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T: Fachverband Teilchenphysik
T 25: Higgs Physics III
T 25.1: Talk
Tuesday, March 17, 2026, 16:15–16:30, KH 00.016
Measurement of differential cross-sections in the H → ZZ* → 4ℓ decay channel with the ATLAS Run 3 data — •Elena Cuppini1, Sandra Kortner1, Oliver Kortner1, Luca Spitzauer1, Alice Reed2, and Tae Hyoun Park1 — 1Max Planck Institute for Physics — 2University of Glasgow
The decay of the Higgs boson into a pair of Z bosons, which subsequently decay to four leptons (H → ZZ* → 4ℓ), provides a clean signature and high signal-to-background ratio for studying the properties of the Higgs boson. This allows for precise differential fiducial cross-section measurements of this decay channel.
The measurement is performed using 165 fb−1 of proton-proton collision data at √s = 13.6 TeV recorded with the ATLAS detector between 2022 and 2024. This data set, for the first time, surpasses the size of the full Run 2 sample, enabling further improvement in measurement precision. The analysis minimises model dependence by employing fiducial phase-space selections that closely match the experimental acceptance, together with corrections for detector effects. The results will be compared to Standard Model predictions, with emphasis on key differential observables.
Keywords: Higgs; ATLAS; cross-sections; leptons