A Precision Model Independent Determination of |Vub| from B -> pi e nu
High Energy Physics - Phenomenology
2009-11-11 v1 High Energy Physics - Experiment
High Energy Physics - Lattice
Abstract
A precision method for determining |Vub| using the full range in q^2 of B-> pi \ell nu data is presented. At large q^2 the form factor is taken from unquenched lattice QCD, at q^2=0 we impose a model independent constraint obtained from B-> pi pi using the soft-collinear effective theory, and the shape is constrained using QCD dispersion relations. We find |Vub| =(3.54\pm 0.17\pm 0.44) x 10^{-3}. With 5% experimental error and 12% theory error, this is competitive with inclusive methods. Theory error is dominated by the input points, with negligible uncertainty from the dispersion relations.
Keywords
Cite
@article{arxiv.hep-ph/0504209,
title = {A Precision Model Independent Determination of |Vub| from B -> pi e nu},
author = {M. Christian Arnesen and Ben Grinstein and Ira Z. Rothstein and Iain W. Stewart},
journal= {arXiv preprint arXiv:hep-ph/0504209},
year = {2009}
}
Comments
4 pages, 3 figures