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American Physical Society, Physical Review D, 11(85)

DOI: 10.1103/physrevd.85.114502

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

Journal article published in 2012 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 and other authors.
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

We calculate form-factor ratios between the semileptonic decays B̅ 0→D+ℓ-ν̅ and B̅ s0→Ds+ℓ-ν̅ 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(Bs0→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 f0(s)(Mπ2)/f0(d)(MK2)=1.046(44)stat(15)syst and f0(s)(Mπ2)/f0(d)(Mπ2)=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.