Semi-leptonic decays of heavy mesons and the Isgur-Wise function in   quenched lattice QCD
  The form factors for the semi-leptonic B->D and B->D* decays are evaluated in quenched lattice QCD at two different values of the coupling, beta=6.0 and 6.2. The action and the operators are fully O(a) non-perturbatively improved. The slope of the Isgur-Wise function is evaluated, and found to be rho^2=0.83^{+15+24}_{-11-1} (quoted errors are statistical and systematic respectively). Ratios of form factors are evaluated and compared to experimental determinations. 
UKQCD Collaboration: K.C.Bowler, G. Douglas, R.D.Kenway,   G.N.Lacagnina, C.M.Maynard