Two-loop QCD corrections to semileptonic b decays at an intermediate recoil
Andrzej Czarnecki, Kirill Melnikov
Abstract
We present complete O(alphas2) corrections to the decay b-->c+l+nu at the point where the invariant mass of the leptons sqrtq2 equals the c quark mass. We use this result, together with previously obtained corrections at the ends of the q2 spectrum, to estimate the total width of the semileptonic b-->c decay with O(alphas2) accuracy, essential for the |Vcb| determination.
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