Skip to main content
Article thumbnail
Location of Repository

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

By Jon A. Bailey, A. Bazavov, C. Bernard, C.M. Bouchard, C. DeTar, Daping Du, A.X. El-Khadra, J. Foley, E.D. Freeland, E. Gámiz, Steven Gottlieb, U.M. Heller, Jongjeong Kim, A.S. Kronfeld, J. Laiho, L. Levkova, P.B. Mackenzie, Y. Meurice, E. Neil, M.B. Oktay, Si-Wei Qiu, J.N. Simone, R. Sugar, D. Toussaint, R.S. Van de Water and Ran Zhou


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

Publisher: American Physical Society
Year: 2012
OAI identifier:
Provided by: Enlighten
Download PDF:
Sorry, we are unable to provide the full text but you may find it at the following location(s):
  • (external link)
  • Suggested articles

    To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.