Abstract
The amplitude for the one-loop-induced decay [ital H][sup +][r arrow][ital W][sup +][gamma] is calculated in the 't Hooft--Feynman gauge in the minimal supersymmetric standard model concentrating on the scalar sector only. It is shown that Feynman graphs with gauge bosons, physical and unphysical scalars, and Faddeev-Popov ghosts in the loops undergo large cancellations to contribute negligibly to the final amplitude. The dominant contribution comes from graphs with internal [ital t] and [ital b] quarks. A numerical evaluation shows that if the charged Higgs boson is lighter than the [ital t] quark, then the branching ratio for this process can be as large as [similar to]7[times]10[sup [minus]5]. For a wide range of parameters, this could remain well within the range of detect- ability at the CERN LHC and SSC.
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