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• W2036693569 abstract "We calculate form-factor ratios between the semileptonic decays bar{B}->D^+ell^-bar{nu} and bar{B}_s->D_s^+ell^-bar{nu} 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^0_s-> mu^+mu^-). We 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 our simulation results at small recoil toward maximum recoil. Our results for the form-factor ratios are $f_0^{(s)}(M^2_pi)/f_0^{(d)}(M^2_K) =1.046(44)_{stat.}(15)_{syst.}$ and $f_0^{(s)}(M^2_pi)/f_0^{(d)}(M^2_pi)=1.054(47)_{stat.}(17)_{syst.}$. In contrast to a QCD sum-rule calculation, no significant departure from U-spin (d<->s) symmetry is observed." @default.
• W2036693569 created "2016-06-24" @default.
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• W2036693569 date "2012-06-04" @default.
• W2036693569 modified "2023-10-05" @default.
• W2036693569 title "<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:msub><mml:mi>B</mml:mi><mml:mi>s</mml:mi></mml:msub><mml:mo>→</mml:mo><mml:msub><mml:mi>D</mml:mi><mml:mi>s</mml:mi></mml:msub><mml:mo>/</mml:mo><mml:mi>B</mml:mi><mml:mo>→</mml:mo><mml:mi>D</mml:mi></mml:math>semileptonic form-factor ratios and their application to<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mi>BR</mml:mi><mml:mo stretchy=false>(</mml:mo><mml:msubsup><mml:mi>B</…" @default.
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• W2036693569 doi "https://doi.org/10.1103/physrevd.85.114502" @default.
• W2036693569 hasPublicationYear "2012" @default.

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