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Description
A search for heavy resonances decaying into a Higgs or a Z boson and a photon, with the Higgs or Z bosons decaying to a pair of bottom quarks ($b\bar{b}$) is presented. The analysis uses proton-proton collision data at $\sqrt{s}$ = 13 TeV collected by the CMS experiment, corresponding to an integrated luminosity of 138 $fb^{-1}$. The analyzed events contain a photon and a massive, large-radius jet, originating from a Lorentz-boosted $b\bar{b}$ system. An advanced transformer-based algorithm is used to form the tagger that identifies Higgs and Z boson candidate jets from $b\bar{b}$ decays. No significant excess above standard model expectations is observed. The results set upper limits on the product of the cross section and the branching fraction for spin-1 $H\gamma$ resonances and spin-0 $Z\gamma$ resonances, with observed values below 0.1 and 0.3 fb, respectively, representing the most stringent limits to date.
