Exact O(g2 alphas) top decay width from general massive two-loop integrals
Abstract
We calculate the b-dependent self-energy of the top quark at O(g2 αs) by using a general massive two-loop algorithm proposed in a previous article. From this we derive by unitarity the O(αs) 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(αs) correction to the top quark width.
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