Abstract
We present a complete calculation of the O( α s ) QCD corrections to the width of the decay H + → t b within the Minimal Supersymmetric Standard Model. We find that the QCD corrections are quite important, and that the supersymmetric QCD corrections (due to gluino, t and b exchange) can be comparable to or even larger than the standard QCD corrections in a large region of the supersymmetric parameter space. This is mainly due to the effect of large left-right mixings of stop ( t ) and sbottom ( b ). This could significantly affect the phenomennology of the H + search.
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