Anti-B--> pi lepton anti-neutron at three lattice spacings

Abstract

The increasing accuracy of experimental results for the exclusive, semileptonic decay ?B ?! l? requires a similarly accurate calculation of the hadronic matrix elements, to determine |Vub|. We present preliminary results for the form factors of the B to light meson decay mode. Using results from three lattices in the range 5.7 - 6.1 we study the dependence on the lattice spacing.