Speaker
Description
We present a search for the rare Higgs boson decay H→Zγ using proton–proton collision data recorded by the CMS experiment at the LHC at center-of-mass energies of 13 and 13.6 TeV, corresponding to a total integrated luminosity of 200 fb⁻¹. The analysis targets final states where the Z boson decays to an electron or muon pair. Sensitivity is enhanced through dedicated event categorization optimized for different production modes. The signal is extracted from a simultaneous fit to the three-body (lepton pair and photon) invariant-mass distributions across all categories. For a Higgs boson mass of 125.38 GeV, the measured signal strength relative to the Standard Model expectation is μ = 1.10 (+0.52/-0.61), with an observed (expected) significance of 1.9 (2.3) standard deviations. These results provide an important test of loop-induced Higgs couplings and no significant evidence of physics beyond the Standard Model is observed.