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B → π l ν semileptonic form factor from three-flavor lattice QCD: <?format ?>A model-independent determination of | V ub |

B → π l ν semileptonic form factor from three-flavor lattice QCD: A model-independent... 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 . http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review D American Physical Society (APS)

B → π l ν semileptonic form factor from three-flavor lattice QCD: <?format ?>A model-independent determination of | V ub |

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References (19)

Publisher
American Physical Society (APS)
Copyright
Copyright © 2009 The American Physical Society
ISSN
1550-2368
DOI
10.1103/PhysRevD.79.054507
Publisher site
See Article on Publisher Site

Abstract

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 .

Journal

Physical Review DAmerican Physical Society (APS)

Published: Mar 1, 2009

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