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| ====== TTP97-20 Techniques for computing two-loop QCD corrections to b-->c transitions ====== |
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| <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. |
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| </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]] | |
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