Dispersive Approach to Semileptonic Form-Factors in Heavy-to-Light Meson Decays

Details Dispersive Approach to Semileptonic Form-Factors in Heavy-to-Light Meson Decays Dispersive Approach to Semileptonic Form-Factors in Heavy-to-Light Meson Decays

1996-02-20

arxiv.org/abs/hep-ph/9602353v1

Phys.Rev. D55 (1997) 2817-2826

Physics

High Energy Physics

High Energy Physics - Phenomenology

30 pages, including 5 Postcript figures

Scientific paper

10.1103/PhysRevD.55.2817

We study the semileptonic decays of heavy mesons into light pseudoscalars by making use of dispersion relations. Constraints from heavy quark symmetry, chiral symmetry and perturbative QCD are implemented into a dispersive model for the form-factors. Large deviations from $B^*$-pole dominance are observed in $B\to\pi\ell\nu$. We discuss the model prediction for this mode and its possible impact on the extraction of $|V_{ub}|$.

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