Extracting |V(ub)| from B->pi l nu Decays Using a Multiply-subtracted Omnes Dispersion Relation
High Energy Physics - Phenomenology
2008-11-26 v2 High Energy Physics - Lattice
Abstract
We use a multiply-subtracted Omnes dispersion relation for the form factor f^+ in B->pi semileptonic decay, allowing the direct input of experimental and theoretical information to constrain its dependence on q^2. Apart from these inputs we use only unitarity and analyticity properties. We obtain |V(ub)|=(4.02 \pm 0.35)\times 10^{-3}, improving the agreement with the value determined from inclusive methods, and competitive in precision with them.
Cite
@article{arxiv.hep-ph/0607258,
title = {Extracting |V(ub)| from B->pi l nu Decays Using a Multiply-subtracted Omnes Dispersion Relation},
author = {Jonathan M Flynn and Juan Nieves},
journal= {arXiv preprint arXiv:hep-ph/0607258},
year = {2008}
}
Comments
10 pages, 4 figures. We include experimental data from BaBar (hep-ex/0607089). Approved for publication in PRD