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preprints:1997:ttp97-20 [2016/03/17 11:03] (current)
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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. 
 +  
 + </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]]   | 
 +| |