====== TTP08-49 NNLO corrections to inclusive semileptonic B decays in the shape-function region ======
 
 
   <hidden TTP08-49  NNLO corrections to inclusive semileptonic B decays in the shape-function region > We compute 2-loop QCD corrections to the hard coefficient functions which arise in the factorization formula for B -> X_u l nu decays in the shape-function region. Our calculation provides the last missing piece required for a NNLO analysis of inclusive semileptonic B decays, which may significantly reduce the theoretical uncertainty in the extraction of the CKM matrix element |V_ub|. Among the technical aspects, we find that the 2-loop hard coefficient functions are free of infrared singularities as predicted by the factorization framework. We perform a brief numerical analysis of the NNLO corrections and include a discussion on charm mass effects.   
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|**Guido Bell**  | 
|**  Nuclear Physics B                     812 264-289 2009  **  |
| {{preprints:2008:ttp08-49.pdf|PDF}} {{preprints:2008:ttp08-49.ps|PostScript}} [[http://arxiv.org/abs/0810.5695|arXiv]]   |
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