Bs→Ds/B→D semileptonic form-factor ratios and their application to BR(Bs0→μ+μ−)
- Bailey, Jon A.
- Bazavov, A.
- Bernard, C.
- Bouchard, C.M.
- DeTar, C.
- Du, Daping
- El-Khadra, A.X.
- Foley, J.
- Freeland, E.D.
- Gámiz, E.
- Gottlieb, Steven
- Heller, U.M.
- Kim, Jongjeong
- Kronfeld, A.S.
- Laiho, J.
- Levkova, L.
- Mackenzie, P.B.
- Meurice, Y.
- Neil, E.
- Oktay, M.B.
- Qiu, Si-Wei
- Simone, J.N.
- Sugar, R.
- Toussaint, D.
- Van de Water, R.S.
- Zhou, Ran
DOIAbstract
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...
Add to ORKG