Impact of SUSY-QCD corrections on top quark decay distributions

We compute the supersymmetric QCD corrections to the decay distribution of polarized top quarks for the semileptonic decay mode $t(\uparrow)\to b l^+\nu_l$. As a byproduct, we reinvestigate the SUSY-QCD corrections to the total decay width $\mathrm{\Gamma }(t\to W^{+}b)$ and resolve a discrepancy between two previous results in the literature.