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We study hadronic two- and three-point correlators relevant for heavy tolight pseudoscalar meson semi-leptonic decays, using Symanzik improved glue,D234 light quark and NRQCD heavy quark actions. Detailed comparisons are madebetween simulations on anisotropic and isotropic lattices involving finitemomentum hadrons. We find evidence that having an anisotropy helps inextracting better signals at higher momenta. Initial results for the formfactors f_+(q^2) and f_0(q^2) are presented with tree-level matching of thelattice heavy-light currents.Comment: 43 pages with 50 postscript figure

Comparison studies of finite momentum correlators on anisotropic and isotropic lattices