Weak form factors for heavy meson decays: An update

Weak form factors for heavy meson decays: an update

The knowledge of the weak transition form factors of heavy mesons is crucial for a proper extraction of the quark mixing parameters, for the analysis of non-leptonic decays and CP violating effects and, related to it, for a search of New Physics. Theoretical approaches for calculating these form factors are quark models [1–8], QCD sum rules [9–12], and lattice QCD [13]. Although in recent years...

Weak Form Factors for Heavy Meson Decays

We calculate the form factors for weak decays of B(s) and D(s) mesons to light pseudoscalar and vector mesons within a relativistic dispersion approach based on the constituent quark picture. This approach gives the form factors as relativistic double spectral representations in terms of the wave functions of the initial and final mesons. The form factors have the correct analytic properties an...

On Constraints for Heavy-Meson Form Factors

Form Factors in D Meson Decays

We study the dΓ/dq spectra and the branching fractions of the D meson exclusive semileptonic decays with the lepton mass effects into consideration. We investigate their sensitivity to form factor models, and find that the decays to a pseudoscalar meson and a lepton pair are sensitive to the property of the form factor F1(q ), and those to a vector meson and a lepton pair to the form factor A1(...

Constraints on form factors for exclusive semileptonic heavy to light meson decays.

We use rigorous QCD dispersion relations to derive model-independent bounds on the B ! l , D ! l , and D ! K l form factors. These bounds are particularly restrictive when the value of the observable form factor at one or more kinematic points is assumed. For example, assuming the validity of heavy meson chiral perturbation theory over the range E < 2m , we nd an upper bound on the B meson deca...