Constraints on Form Factors For Exclusive Semileptonic Heavy to Light Meson Decays

Details Constraints on Form Factors For Exclusive Semileptonic Heavy to Light Meson Decays Constraints on Form Factors For Exclusive Semileptonic Heavy to Light Meson Decays

1994-12-19

arxiv.org/abs/hep-ph/9412324v3

Phys.Rev.Lett.74:4603-4606,1995

Physics

High Energy Physics

High Energy Physics - Phenomenology

Fixed for auto-ps generator. 8 pages, 2 figures, uses epsf.tex and lanlmac.tex. (Shortened to comply with Phys. Rev. Lett edit

Scientific paper

10.1103/PhysRevLett.74.4603

We use rigorous QCD dispersion relations to derive model-independent bounds on the B -> pi l nu, D -> pi l nu and D -> K l nu form factors. These bounds are particularly restrictive when the value of the observable form factor at one or more kinematic points is assumed. With reasonable assumptions we find f_B < 195 MeV and that the shape of the form factor becomes severely constrained. These constraints are useful both for model discrimination and for model-insensitive extraction of CKM mixing parameters.

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