, Volume 31, Issue 4, pp 725-727
Date: 12 Mar 2007

Study of the semileptonic decays B→π , D→π and D→K

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The semileptonic decay Bπ is studied starting from a simple quark model that takes into into account the effect of the B*-resonance. A novel, multiply subtracted, Omnès dispersion relation has been implemented to extend the predictions of the quark model to all q2 values accessible in the physical decay. By comparison to the experimental data, we extract | V ub| = (3.4±0.2(exp.)±0.7(theory))0-3. As a further test of the model, we have also studied Dπ and DK decays for which we get good agreement with experiment.