Search for a resonance decaying into a scalar particle and a Higgs boson in the final state with two bottom quarks and two photons with 199 fb−1 of data collected at s=13 and 13.6 TeV with the ATLAS detector

A search for the resonant production of a heavy scalar X decaying into a lighter scalar S and a Higgs boson, through the process X -> S(-> b (b) over bar )H(-> gamma gamma), where the two photons are consistent with the Higgs boson decay, is performed. Th