One-loop QCD Corrections to Top Quark Decay into a Neutralino and Light Stop

Abstract

We calculate the one-loop QCD corrections to $t\to {\tilde{t}}_1{\tilde{\chi }}_j^0$ using dimensional reduction scheme, including QCD and supersymmetric QCD corrections. The analytic expressions for the corrections to the decay width are given, which can easily be extended to $t\to {\tilde{\chi }}_j^{+}{\tilde{b}}_i$. 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.

Comments: 13 pages, 5 figures, revised version(using dimensional reduction technique, the corrections have been recalculated)