Exact O(g^2 alpha_s) top decay width from general massive two-loop   integrals
  We calculate the b-dependent self-energy of the top quark at O(g^2 \alpha_s) by using a general massive two-loop algorithm proposed in a previous article.   From this we derive by unitarity the O(\alpha_s) radiative corrections to the decay width of the top quark, where all effects associated with the $b$ quark mass are included without resorting to a mass expansion. Our results agree with the analytical results available for the O(\alpha_s) correction to the top quark width. 
Adrian Ghinculov (UCLA), York-Peng Yao (U. of Michigan)