We update the extraction of |Vub| from exclusive semileptonic B to pi decays, combining experimental partial branching fraction information with theoretical form factor calculations, using the recently revised HPQCD results for the form factors f_+ and f_0. We use Omnes representations to provide the required parametrisations of the form factors. The extracted value is 10^3 |Vub| = 3.47+/-0.29+/-0.03, in striking agreement with |Vub| extracted using all other inputs in CKM fits and showing some disagreement with |Vub| extracted from inclusive semileptonic B to pi decays.
@article{arxiv.0705.3553,
title = {|Vub| from exclusive semileptonic B to pi decays revisited},
author = {Jonathan M Flynn and Juan Nieves},
journal= {arXiv preprint arXiv:0705.3553},
year = {2008}
}
Comments
5 pages, 1 figure. Version accepted for publication