B -> pi l nu at three lattice spacings
  The increasing accuracy of experimental results for the exclusive, semileptonic decay B -> pi l nu 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 <= beta <= 6.1 we study the dependence on the lattice spacing. 
S.M. Ryan, A.X. El-Khadra, S. Hashimoto, A.S. Kronfeld, P.B. Mackenzie   and J.N. Simone