Semi-leptonic decays of heavy mesons and the Isgur-Wise function in quenched lattice QCD
UKQCD Collaboration, K. C. Bowler, G. Douglas, R. D. Kenway, G. N. Lacagnina, C. M. Maynard
Abstract
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 rho2=0.83+15+24-11-1 (quoted errors are statistical and systematic respectively). Ratios of form factors are evaluated and compared to experimental determinations.
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