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( The Belle Collaboration )
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Particle Data Group)
These should be combined with the values of f + (q 2 ) presented in Table II to reconstruct the full correlation matrices
We calculate the form factor f + ( q 2 ) for B -meson semileptonic decay in unquenched lattice QCD with 2 + 1 flavors of light sea quarks. We use Asqtad-improved staggered light quarks and a Fermilab bottom quark on gauge configurations generated by the MILC Collaboration. We simulate with several light-quark masses and at two lattice spacings, and extrapolate to the physical quark mass and continuum limit using heavy-light meson staggered chiral perturbation theory. We then fit the lattice result for f + ( q 2 ) simultaneously with that measured by the BABAR experiment using a parameterization of the form-factor shape in q 2 , which relies only on analyticity and unitarity in order to determine the Cabibbo-Kobayashi-Maskawa matrix element | V ub | . This approach reduces the total uncertainty in | V ub | by combining the lattice and experimental information in an optimal, model-independent manner. We find a value of | V ub | × 10 3 = 3.38 ± 0.36 .
Physical Review D – American Physical Society (APS)
Published: Mar 1, 2009
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