b → sγin the two-Higgs-doublet model

The processes b→sγ and b→sg are examined within the context of the two-Higgs-doublet extension of the standard model. The usual $W^{\mathrm{-}}$ loop diagrams responsible for these decays are now supplemented by loops involving charged Higgs bosons ($H^{\mathrm{-}}$). We find that the total amplitudes for both processes are substantially enhanced in this model for a wide range of top-quark and charged-Higgs-boson masses. For a reasonable range of the ratio of the vacuum expectation values of the two Higgs doublets, these decays can provide important tests of such models.