Bs→Ds/B→D semileptonic form-factor ratios and their application to BR(Bs0→μ+μ−)

Bailey, J. A. et al. (2012) Bs→Ds/B→D semileptonic form-factor ratios and their application to BR(Bs0→μ+μ−). Physical Review D, 85(11), 114502. (doi: 10.1103/PhysRevD.85.114502)

Full text not currently available from Enlighten.

Abstract

We calculate form-factor ratios between the semileptonic decays B⎯⎯⎯0→D+ℓ−ν⎯⎯ and B⎯⎯⎯0s→D+sℓ−ν⎯⎯ with lattice QCD. These ratios are a key theoretical input in a new strategy to determine the fragmentation fractions of neutral B decays, which are needed for measurements of BR(B0s→μ+μ−). We use the MILC ensembles of gauge configurations with 2+1 flavors of sea-quarks at two s of approximately 0.12 fm and 0.09 fm. We use the model-independent z parametrization to extrapolate our simulation results at small recoil toward maximum recoil. Our results for the form-factor ratios are f(s)0(M2π)/f(d)0(M2K)=1.046(44)stat(15)syst and f(s)0(M2π)/f(d)0(M2π)=1.054(47)stat(17)syst. In contrast to a QCD sum-rule calculation, no significant departure from U-spin (d↔s) symmetry is observed.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Bouchard, Dr Chris and DeTar, Professor Carleton and Foley, Dr Justin
Authors: Bailey, J. A., Bazavov, A., Bernard, C., Bouchard, C.M., DeTar, C., Du, D., El-Khadra, A.X., Foley, J., Freeland, E.D., Gámiz, E., Gottlieb, S., Heller, U.M., Kim, J., Kronfeld, A.S., Laiho, J., Levkova, L., Mackenzie, P.B., Meurice, Y., Neil, E., Oktay, M.B., Qiu, S.-W., Simone, J.N., Sugar, R., Toussaint, D., Van de Water, R.S., and Zhou, R.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physical Review D
Publisher:American Physical Society
ISSN:1550-7998
ISSN (Online):1550-2368

University Staff: Request a correction | Enlighten Editors: Update this record