SupersymmetricQCDdecoupling properties inH+→tb¯decay

The supersymmetric (SUSY) QCD radiative corrections to the $\Gamma {(H}^{+}\to t\overline{b})$ partial decay width are analyzed within the minimal supersymmetric standard model at the one-loop level, $\mathcal{O}\left({\alpha }_s\right),$ and in the decoupling limit. We present the analytical expressions of these corrections in the large SUSY masses limit and study the decoupling behavior of these corrections in various limiting cases. We find that if the SUSY mass parameters are large and of the same order, the one-loop SUSY QCD corrections do not decouple. The nondecoupling contribution is enhanced by $\tan \beta$ and therefore large corrections are expected in the large $\tan \beta$ limit. In contrast, we also find that the SUSY QCD corrections decouple if the masses of either the squarks or the gluinos are separately taken large.