Two-loop QCD corrections to $CP$-even Higgs boson decays into $Vγ$ in the Type-I Two-Higgs-Doublet Model

We investigate the QCD corrections to the loop-induced decays of the heavy $CP$-even Higgs boson, $H \to Vγ$ ($V = Z, γ$), within the framework of the Type-I Two-Higgs-Doublet Model (THDM). Owing to the similarity of the underlying loop topologies, the two decay channels exhibit closely correlated b