Comparative analysis of non-perturbative effects in B -> X_u l anti-nu_l decays
High Energy Physics - Phenomenology
2008-11-26 v1
Abstract
In order to extract the Cabibbo-Kobayashi-Maskawa matrix element |V_{ub}| from B -> X_u l anti-nu_l decays, the overwhelming background from B -> X_c l anti-nu_l decays must be reduced by appropriate acceptance cuts. We study the non-perturbative effects due to the motion of the b quark inside the B meson on the phenomenologically relevant decay distributions of B -> X_u l anti-nu_l in the presence of such cuts in a comparative analysis based on shape functions and the parton model in the light-cone limit. Comparisons with recent data from the CLEO, BABAR, and BELLE collaborations favor the shape-function approach.
Keywords
Cite
@article{arxiv.hep-ph/0703239,
title = {Comparative analysis of non-perturbative effects in B -> X_u l anti-nu_l decays},
author = {B. A. Kniehl and G. Kramer and J. -F. Yang},
journal= {arXiv preprint arXiv:hep-ph/0703239},
year = {2008}
}
Comments
27 pages, 11 figures