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$B_s\to D_s/B\to D$ Semileptonic Form-Factor Ratios and Their Application to BR($B^0_s\to \mu^+\mu^-$) [electronic resource].

Published:
Washington, D.C. : United States. Dept. of Energy. Office of Science, 2012.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Additional Creators:
Fermi National Accelerator Laboratory, United States. Department of Energy. Office of Science, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary:
We calculate form-factor ratios between the semileptonic decays {bar B}° → D⁺ ℓ⁻{bar ν} and {bar B}{sub s}° → D{sub s}⁺ℓ⁻{bar ν} with lattice QCD. These ratios are a key theoretical input in a new strategy to determine the fragmentation fractions of the neutral B decays, which are needed for measurements of BR(B{sub s}° → μ⁺μ⁻). They use the MILC ensembles of gauge configurations with 2 + 1 flavors of sea quarks at two lattice spacings of approximately 0.12 fm and 0.09 fm. We use the model-independent z parametrization to extrapolate their simulation results at small recoil toward maximum recoil. The results for the form-factor ratios are {line_integral}₀{sup (s)} (M{sub π}²)/{line_integral}₀{sup (d)} (M{sub K}²) = 1.046(44){sub stat.}(15){sub syst.} and {line_integral}₀{sup (s)} (M{sub π}²)/{line_integral}₀{sup (d)} (M{sub π}²) = 1.054(47){sub stat.}(17){sub syst.}. In contrast to a QCD sum-rule calculation, no significant departure from U-spin (d ↔ s) symmetry is observed.
Report Numbers:
E 1.99:fermilab-pub-12-047-t
fermilab-pub-12-047-t
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Note:
Published through SciTech Connect.
02/01/2012.
"fermilab-pub-12-047-t"
"arXiv eprint number arXiv:1202.6346"
Submitted to Phys.Rev.D 86 3 ISSN 1550--7998 FT
Bernard, C.; DeTar, C.; El-Khadra, A.X.; Freeland, E.D.; Gamiz, E.; Bazavov, A.; Gottlieb, Steven; Foley, J.; Bailey, Jon A.; Bouchard, C.M.; Du, Daping.
Funding Information:
AC02-07CH11359
View MARC record | catkey: 14706031