O(alpha_s^2) corrections to b -> c decay at zero recoil

Abstract

Analytic formulae are presented for the two-loop perturbative QCD corrections to b -> c decay at the zero recoil point, which are required for the extraction of |V_bc| from measurements of exclusive B -> D* l nu decays. The results are in agreement with those of Czarnecki and Melnikov. Some comments on the numerical evaluation of the diagrams involved are made.

Latex, 12 pages, 13 postscript figures included with epsfig

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