One loop QCD corrections to top quark decay into neutralino and light stop

We calculate the one-loop QCD corrections to t → t ? χ ?0 using dimensional reduction scheme, including QCD and supersymmetric QCD corrections. The analyticexpressions for the corrections to the decay width are given, which can easily be extended to t → χ ?+j ?bi. The numerical results show that the correction amounts to more than a 10% reduction in the partial width relative to the tree level result. We also compare the corrections in the no-mixing stop case with those in the mixing stop case.