B Decays on the Lattice and Results for Phenomenology
  Lattice Monte Carlo simulations now include the effects of 2 light sea quarks and 1 strange sea quark through the use of an improved staggered fermion action. Consequently, results important to phenomenology are free of the approximate 10% errors inherent in the quenched approximation. This talk reports on calculations of the B and Bs decay constants and B -> pi l nu form factors. Accurate determinations of these quantities will lead to tighter constraints on CKM matrix elements. 
Matthew Wingate, Christine Davies, Alan Gray, Emel Gulez, Junko   Shigemitsu, G. Peter Lepage