Subleading Shape Functions in Inclusive B Decays

Details Subleading Shape Functions in Inclusive B Decays Subleading Shape Functions in Inclusive B Decays

2004-09-09

arxiv.org/abs/hep-ph/0409115v2

JHEP 0411:073,2004

Physics

High Energy Physics

High Energy Physics - Phenomenology

22 pages, 2 figures; several typos corrected; version published in JHEP

Scientific paper

10.1088/1126-6708/2004/11/073

The contributions of subleading shape functions to inclusive decay distributions of B mesons are derived from a systematic two-step matching of QCD current correlators onto soft-collinear and heavy-quark effective theory. At tree-level, the results can be expressed in terms of forward matrix elements of bi-local light-cone operators. Four-quark operators, which arise at O(g^2), are included. Their effects can be absorbed entirely into a redefinition of other shape functions. Our results are in disagreement with some previous studies of subleading shape-function effects in the literature. A numerical analysis of B->X_u+l+nu decay distributions suggests that power corrections are small, with the possible exception of the endpoint region of the charged-lepton energy spectrum.

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