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The Fermilab Lattice and MILC collaborations are completing a comprehensiveprogram of heavy-light physics on MILC (2+1)-flavor asqtad ensembles withlattice spacings as small as 0.045 fm and light-to-strange-quark mass ratios aslow as 1/20. We use the Fermilab interpretation of the clover action for heavyvalence quarks and the asqtad action for the light valence quarks. The centralgoal of the program is to provide ever more exacting tests of the unitarity ofthe CKM matrix. We present preliminary results for one part of the program,namely the analysis of the semileptonic decay B -> D l nu at nonzero recoil.

Semileptonic B to D decays at nonzero recoil with 2+1 flavors of improved staggered quarks. An update