Impact of Four-Quark Shape Functions on Inclusive B Decay Spectra

Details Impact of Four-Quark Shape Functions on Inclusive B Decay Spectra Impact of Four-Quark Shape Functions on Inclusive B Decay Spectra

2004-11-01

arxiv.org/abs/hep-ph/0411027v2

Eur.Phys.J.C44:205-209,2005

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages, 2 figures; minor revisions and figure added; version to appear in Eur. Phys. J. C

Scientific paper

10.1140/epjc/s2005-02360-4

It has recently been pointed out that a new class of subleading shape functions involving B-meson matrix elements of non-local four-quark operators contributes at order Lambda_{QCD}/m_b to B->X_u+l+nu decay distributions in the endpoint region. The corresponding functions f_u(omega) and f_v(omega) are estimated using the vacuum-insertion approximation. A numerical analysis of various B->X_u+l+nu decay spectra suggests that these power corrections are very small, below present theoretical uncertainties due to other subleading shape-function contributions.

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