TY - JOUR

T1 - Rare B decays using lattice QCD form factors

AU - Horgan, R. R.

AU - Liu, Z.

AU - Meinel, S.

AU - Wingate, M.

N1 - Funding Information:
We are grateful to R. Zwicky for discussions about the form factor fits and to the MILC Collaboration for making their gauge-field configurations publicly available. This work was supported in part by the STFC (UK), the DoE (US), and NSFC (China).
Publisher Copyright:
© Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence.

PY - 2014

Y1 - 2014

N2 - In this write-up we review and update our recent lattice QCD calculation of B→ K∗, Bs→ Ø, and Bs→ K∗ form factors [1]. 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 [2]. The modest improvements to the form factor fits lead to improved determinations of FL, the fraction of longitudinally polarized vector mesons, but have little effect on most other observables.

AB - In this write-up we review and update our recent lattice QCD calculation of B→ K∗, Bs→ Ø, and Bs→ K∗ form factors [1]. 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 [2]. The modest improvements to the form factor fits lead to improved determinations of FL, the fraction of longitudinally polarized vector mesons, but have little effect on most other observables.

UR - http://www.scopus.com/inward/record.url?scp=85030120588&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85030120588&partnerID=8YFLogxK

M3 - Conference article

AN - SCOPUS:85030120588

VL - Part F130500

JO - Proceedings of Science

JF - Proceedings of Science

SN - 1824-8039

M1 - 372

T2 - 32nd International Symposium on Lattice Field Theory, LATTICE 2014

Y2 - 23 June 2014 through 28 June 2014

ER -