Erlangen 2026 – scientific programme
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T: Fachverband Teilchenphysik
T 25: Higgs Physics III
T 25.5: Talk
Tuesday, March 17, 2026, 17:15–17:30, KH 00.016
Combined analysis of H → γ γ and H → ZZ* → 4ℓ cross sections using partial Run-3 CMS data — •Linus Erdmann, Johannes Erdmann, Jan Lukas Späh, and Maximilian Wrabetz — III. Physikalisches Institut A, RWTH Aachen University
Measurements of the Higgs boson production cross sections and decay channels are extensively studied and essential to probe possible deviations from the standard model in the scalar sector.
This presentation outlines studies towards a combined measurement of the Higgs boson production cross section in the diphoton and four-lepton decay channels with the CMS experiment. The dataset used comprises proton-proton collisions at √s = 13.6 TeV recorded during Run-3, corresponding to an integrated luminosity of 171.4 fb−1. Both decay channels provide clean signatures and well-understood event topologies, which contribute to a precise determination of Higgs boson properties. Their combination increases the overall statistical precision and enables the simultaneous constraint of several Higgs boson properties. For each channel, the cross sections are measured in a fiducial phase space at particle level, which enhances model independence and minimises extrapolation uncertainties, before being extrapolated to the total phase space for the combined measurement.
These studies highlight the potential of combining different Higgs boson decay channels for a more precise determination of its production cross sections and discuss prospects for simultaneously constraining Higgs boson couplings through the joint analysis of the two channels.
Keywords: Higgs boson; Photon; Four-lepton; Cross section; Diphoton four-lepton combination