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 — preprints:1997:ttp97-08 [2016/03/17 11:03] (current) Line 1: Line 1: + ====== TTP97-08 Two-loop QCD Corrections to $b \to c$ Transitions   at Zero Recoil: Analytical Results ====== + + + We present analytical results for the $O(\alpha_s^2)$ contributions + to the functions $\eta _A$ and $\eta _V$ which parameterize QCD + corrections to semileptonic $b \to c$ transitions at zero recoil. + Previously obtained approximate results are confirmed.  The methods of + computing the relevant two-loop diagrams with two mass scales are + discussed in some detail. + + + |**Andrzej Czarnecki and Kirill Melnikov**  | + |** Nucl. Phys. B505 65--83 1997  **  | + | {{preprints:1997:ttp97-08.pdf|PDF}} {{preprints:1997:ttp97-08.ps|PostScript}} [[http://arxiv.org/abs/hep-ph/9703277|arXiv]]   | + | |