Impact of four-quark shape functions on inclusive B decay spectra
Institute for High-Energy Phenomenology, Newman Laboratory for Elementary-Particle Physics, Cornell University, NY 14853, Ithaca, USA
2 Institute for Advanced Study, School of Natural Sciences, NJ 08540, Princeton, USA
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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 to decay distributions in the endpoint region. The corresponding functions and are estimated using the vacuum-insertion approximation. A numerical analysis of various decay spectra suggests that these power corrections are very small, below present theoretical uncertainties due to other subleading shape-function contributions.
© Springer-Verlag, 2005