%0 Journal Article
%T Semi-Leptonic b-decay at Intermediate Recoil
%A Dowling
%A Matthew
%A Pak
%A Alexey
%A Czarnecki
%A Andrzej
%J High Energy Physics - Phenomenology
%D 2008
%I 
%R 10.1103/PhysRevD.78.074029
%X We compute the O(\alpha_s^2) corrections to the differential rate of the semileptonic decay b -> clv at the "intermediate recoil" point, where the c-quark mass and the invariant mass of the leptons are equal. The calculation is based on an expansion around two opposite limits of the quark masses m_{b,c}: m_c ~ m_b and m_c << m_b. The former case was previously studied; we correct and extend that result. The latter case is new. The smooth matching of both expansions provides a check of both. We clarify the discrepancy between the recent determinations of the full NNLO QCD correction to the semileptonic b -> c rate, and its earlier estimate.
%U http://arxiv.org/abs/0809.0491