Search for a resonance decaying into a scalar particle and a Higgs boson in the final state with two bottom quarks and two photons in proton–proton collisions at s = 13 TeV with the ATLAS detector

A search for the resonant production of a heavy scalar X decaying into a Higgs boson and a new lighter scalar S, through the process X → S(→bb¯$$ b\overline{b} $$)H(→γγ), where the two photons are consistent with the Higgs boson decay, is performed. The search is conducted using an integrated lumino