Erratum: B s→D s/B→D semileptonic form-factor ratios and their application to BR(Bs0→μ +μ -)
/ Authors
J. Bailey, A. Bazavov, C. Bernard, C. Bouchard, C. DeTar, D. Du, A. El-Khadra, J. Foley, E. Freeland, E. Freeland
and 17 more authors
E. Gámiz, S. Gottlieb, U. Heller, Jongjeong Kim, A. Kronfeld, J. Laiho, L. Levkova, P. Mackenzie, Y. Meurice, E. Neil, M. Oktay, S. Qiu, J. Simone, R. Sugar, D. Toussaint, R. V. D. Water, R. Zhou
/ 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.
Journal: Physical Review D