Institute for Theoretical Particle Physics (TTP)

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preprints:2008:ttp08-49 [2016/03/17 11:03] (current)
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 +====== TTP08-49 NNLO corrections to inclusive semileptonic B decays in the shape-function region ====== 
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 +   <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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