QCD CORRECTIONS TO THE DECAY H-]T(B)OVER-BAR IN THE MINIMAL SUPERSYMMETRIC STANDARD MODEL()

We present a complete calculation of the Omicron(alpha(s)) QCD correct ions to the width of the decay H+ --> <t (b) over bar> within the Mini mal Supersymmetric Standard Model. We find that the QCD corrections ar e quite important, and that the supersymmetric QCD corrections (due to gluino, <(t) over tilde> and <(b) over tilde> exchange) can be compar able to or even larger than the standard QCD corrections in a large re gion of the supersymmetric parameter space. This is mainly due to the effect of large left-right mixings of stop (<(t) over tilde>) and sbot tom (<(b) over tilde>). This could significantly affect the phenomenol ogy of the H+ search.