We report on form factors for the B->K l^+ l^- semi-leptonic decay process. We use several lattice spacings from a=0.12 fm down to 0.06 fm and a variety of dynamical quark masses with 2+1 flavors of asqtad quarks provided by the MILC Collaboration. These ensembles allow good control of the chiral and continuum extrapolations. The b-quark is treated as a clover quark with the Fermilab interpretation. We update our results for f_\parallel and f_\perp, or, equivalently, f_+ and f_0. In addition, we present new results for the tensor form factor f_T. Model independent results are obtained based upon the z-expansion.
@article{arxiv.1211.1390,
title = {Form factors for semi-leptonic B decays},
author = {Ran Zhou and Steven Gottlieb and Jon A. Bailey and Daping Du and Aida X. El-Khadra and R. D. Jain and Andreas S. Kronfeld and Ruth S. Van de Water and Yuzhi Liu and Yannick Meurice},
journal= {arXiv preprint arXiv:1211.1390},
year = {2019}
}
Comments
7 pages, 4 figures, presented at The XXXth International Symposium on Lattice Field Theory - Lattice 2012, June 24-29, 2012 Cairns, Australia, to appear as PoS(Lattice 2012)120