Top decays into lighter stop and gluino
  We have calculated the decay width of the process $t \to \tilde{g} \tilde{t}_1$ including one loop QCD corrections. We found that the decay width of the such process could be comparable with that of the standard channel $t \to b W^+$, and, its QCD correction could enhance the widths over 30% in a very large mass range of the lighter stop. 
Lian You Shan and Shou Hua Zhu (ITP, Beijing)