A new model-independent way of extracting |V_ub/V_cb|
High Energy Physics - Phenomenology
2008-11-26 v1
Abstract
The ratio between the photon spectrum in B -> X_s gamma and the differential semileptonic rate wrt the hadronic variable M_X/E_X is a short-distance quantity calculable in perturbation theory and independent of the Fermi motion of the b quark in the B meson. We present a NLO analysis of this ratio and show how it can be used to determine |V_ub/V_cb| independently of any model for the shape function. We also discuss how this relation can be used to test the validity of the shape-function theory on the data.
Cite
@article{arxiv.hep-ph/0204140,
title = {A new model-independent way of extracting |V_ub/V_cb|},
author = {Ugo Aglietti and Marco Ciuchini and Paolo Gambino},
journal= {arXiv preprint arXiv:hep-ph/0204140},
year = {2008}
}
Comments
20 pages, 3 figs