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It has recently been pointed out that a new class of subleading shapefunctions involving B-meson matrix elements of non-local four-quark operatorscontributes at order Lambda_{QCD}/m_b to B->X_u+l+nu decay distributions in theendpoint region. The corresponding functions f_u(omega) and f_v(omega) areestimated using the vacuum-insertion approximation. A numerical analysis ofvarious B->X_u+l+nu decay spectra suggests that these power corrections arevery small, below present theoretical uncertainties due to other subleadingshape-function contributions.Comment: 8 pages, 2 figures; minor revisions and figure added; version to  appear in Eur. Phys. J.

Impact of four-quark shape functions on inclusive B decay spectra