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T: Fachverband Teilchenphysik
T 25: Higgs Physics III
T 25.2: Vortrag
Dienstag, 17. März 2026, 16:30–16:45, KH 00.016
Higgs boson production cross-section measurements in the H → ZZ* → 4l decay channel with the ATLAS Run 3 data — •Luca Matthias Spitzauer1, Elena Cuppini1, Sandra Kortner1, Oliver Kortner1, Tae Hyoun Park1, and Alice Reed2 — 1Max-Planck-Institut for Physics, Garching — 2University of Glasgow, Glasgow
Cross-section measurements of various Higgs boson production processes are crucial for exploring Higgs boson properties and are highly sensitive to potential physics beyond the Standard Model. The decay of the Higgs boson into a pair of Z bosons, each subsequently decaying into two leptons (H → ZZ* → 4l), is particularly important for these measurements due to its exceptionally clean signature.
Within the framework of Simplified Template Cross Sections (STXS), exclusive regions of phase space are defined for the different Higgs boson production modes. Accurate classification of reconstructed events into the appropriate STXS Higgs production regions is essential to enhance signal sensitivity and reduce uncertainties. The latest cross-section measurements in each STXS production region are based on 165 fb−1 of Run 3 ATLAS data. The analysis results are presented together with improvements achieved through an optimized classification employing a new Set Transformer machine learning model, replacing the baseline Recurrent Neural Network method.
Keywords: Higgs boson; Four-lepton-decay; ATLAS experiment; Production cross-section; Run 3