期刊
NUCLEAR PHYSICS B
卷 812, 期 1-2, 页码 264-289出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nuclphysb.2008.12.018
关键词
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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 vertical bar V(ub)broken vertical bar. 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. (C) 2009 Elsevier B.V. All rights reserved.
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