Abstract
The semileptonic decay B → π is studied starting from a simple quark model that takes into into account the effect of the B*-resonance. A novel, multiply subtracted, Omnes dispersion relation has been implemented to extend the predictions of the quark model to all q 2 values accessible in the physical decay. By comparison to the experimental data, we extract |V ub | = (3.4 ± 0.2(exp.) ± 0.7(theory)) 10−3. As a further test of the model, we have also studied D → π and D → K decays for which we get good agreement with experiment.
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