Non-Universal Effects in Semi-Inclusive B Decays
Abstract
We show that most spectra in the semileptonic decay B -> X_u + l + nu, such as for example the distribution in the light-cone momentum p_+ = E_X - p_X recently considered, do not have the same long-distance structure of the photon spectrum in the radiative decay B -> X_s + gamma. On the contrary, the semileptonic distribution in the final hadron energy E_X is connected to the radiative spectrum via short-distance factors only. The E_X distribution also has a specific infrared structure known as the ``Sudakov shoulder''. We also discuss an explicit check of the resummation formula for the semileptonic decays, based on a recent second-order computation.
Keywords
Cite
@article{arxiv.hep-ph/0601242,
title = {Non-Universal Effects in Semi-Inclusive B Decays},
author = {U. Aglietti},
journal= {arXiv preprint arXiv:hep-ph/0601242},
year = {2009}
}
Comments
LaTeX file, 6 pages, no figures. To appear in the Proceedings of the 7th International Symposium on Radiative Corrections (application of quantum field theory to phenomenology) Shonan Village, Japan October 2-7, 2005 (Nucl. Phys. B Proc. Suppl.)