====== TTP97-13 Complete O(alpha_s^2) Corrections to Zero-Recoil Sum Rules for B-->D* Transitions ======
 
 
   <hidden TTP97-13  Complete O(alpha_s^2) Corrections to Zero-Recoil Sum Rules for B-->D* Transitions > We present the complete O(alpha_s^2) corrections to the
 Wilson coefficient of the unit operator in the zero-recoil sum rule
 for the B-->D* transition.  We include both perturbative and
 power-suppressed nonperturbative effects in a manner consistent with
 the operator product expansion.  The impact of these corrections on
 |V_cb| extracted from semileptonic B-->D* decays near
 zero recoil is discussed.  The mixing of the heavy quark kinetic
 operator with the unit operator at the two loop level is
 obtained.  O(alpha_s) corrections to a number of
 power-suppressed operators are calculated.
 
 </hidden>
|**Andrzej Czarnecki, Kirill Melnikov, and Nikolai Uraltsev**  | 
|** Phys. Rev. D57 1769 1998  **  |
| {{preprints:1997:ttp97-13.pdf|PDF}} {{preprints:1997:ttp97-13.ps|PostScript}} [[http://arxiv.org/abs/hep-ph/9706311|arXiv]]   |
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