====== TTP97-08 Two-loop QCD Corrections to $b \to c$ Transitions   at Zero Recoil: Analytical Results ======
 
 
   <hidden 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.
 
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|**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]]   |
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