Asymptotics of heavy-meson form factors

Asymptotics of heavy-meson form factors

Using methods developed for hard exclusive QCD processes, we calculate the asymptotic behaviour of heavy-meson form factors at large recoil. It is determined by the leadingand subleading-twist meson wave functions. For 1 ≪ |v · v′| ≪ mQ/Λ, the form factors are dominated by the Isgur–Wise function, which is determined by the interference between the wave functions of leading and subleading twist...

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

Bounding Heavy Meson Form Factors Using Inclusive Sum Rules

We utilize inclusive sum rules to construct both upper and lower bounds on the form factors for B → D,D, ρ, π, ω,K and K semi-leptonic and radiative decays. We include the leading nonperturbative 1/E corrections and point out cases when αs corrections are equally important. We compute the αs correction to the lower bound on the B→D∗ form factor f(w) at zero recoil, thereby constraining its norm...

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...