The B -> D* l nu Form Factor at Zero Recoil

Details The B -> D* l nu Form Factor at Zero Recoil The B -> D* l nu Form Factor at Zero Recoil

1999-10-13

arxiv.org/abs/hep-lat/9910026v1

Nucl.Phys.Proc.Suppl.83:334-336,2000

Physics

High Energy Physics

High Energy Physics - Lattice

Lattice99(heavyquarks); 3 pgs, LaTeX

Scientific paper

We describe a model independent lattice QCD method for determining the deviation from unity for h_{A1}(1), the B -> D* l nu form factor at zero recoil. We extend the double ratio method previously used to determine the B -> D l nu form factor. The bulk of statistical and systematic errors cancel in the double ratios we consider, yielding form factors which promise to reduce present theoretical uncertainties in the determination of V_{cb}. We present results from a prototype calculation at a single lattice spacing corresponding to beta=5.7.

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