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+====== TTP97-20 Techniques for computing two-loop QCD corrections to b-->c transitions ======
+   <hidden TTP97-20  Techniques for computing two-loop QCD corrections to b-->c transitions > We have recently presented the complete  O(alpha_s^2)
+ corrections to the semileptonic decay width of the  b  quark at
+ maximal recoil.  Here we discuss various technical aspects of that
+ calculation and further applications of similar methods.  In
+ particular, we describe an expansion which facilitates the phase space
+ integrations and the treatment of the mixed real--virtual corrections,
+ for which Taylor expansion does not work and the so-called eikonal
+ expansion must be employed. Several terms of the
+ expansion are given for the  O(alpha_s^2)  QCD corrections
+ to the differential semileptonic decay width of the  b --quark at
+ maximal recoil.  We also demonstrate how the light quark loop
+ corrections to the top quark decay rate can be obtained using the same
+ methods.  We briefly discuss the application of these techniques to
+ the calculation of the  O(alpha_s^2)  correction to zero
+ recoil sum rules for heavy flavor transitions.
+ </hidden>
+|**Andrzej Czarnecki and Kirill Melnikov**  |
+|** Phys. Rev. D56 7216--7227 1997  **  |
+| {{preprints:1997:ttp97-20.pdf|PDF}} {{preprints:1997:ttp97-20.ps|PostScript}} [[http://arxiv.org/abs/hep-ph/9706227|arXiv]]   |
+| |