O(alphas2) corrections to b -> c decay at zero recoil
J. Franzkowski, J. B. Tausk
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 |Vbc| 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.
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