Rare $B$ decays using lattice QCD form factors
Abstract
In this write-up we review and update our recent lattice QCD calculation of , , and form factors [arXiv:1310.3722]. These unquenched calculations, performed in the low-recoil kinematic regime, provide a significant improvement over the use of extrapolated light cone sum rule results. The fits presented here include further kinematic constraints and estimates of additional correlations between the different form factor shape parameters. We use these form factors along with Standard Model determinations of Wilson coefficients to give Standard Model predictions for several observables [arXiv:1310.3887]. The modest improvements to the form factor fits lead to improved determinations of , the fraction of longitudinally polarized vector mesons, but have little effect on most other observables.
Cite
@article{arxiv.1501.00367,
title = {Rare $B$ decays using lattice QCD form factors},
author = {R. R. Horgan and Z. Liu and S. Meinel and M. Wingate},
journal= {arXiv preprint arXiv:1501.00367},
year = {2015}
}
Comments
Contribution to the Proceedings of the 32nd International Symposium on Lattice Field Theory (LATTICE 2014), 23-28 June 2014, Columbia University. 13 pages (7 pp to appear in Proceedings of Science + 6 pp of supplementary details). Fits in v2 use block-diagonal correlations (results not significantly changed). v2 corrects a permutation of columns in Table 8/11 of v1/v2. Reference added