Models for Light-Cone Meson Distribution Amplitudes

Details Models for Light-Cone Meson Distribution Amplitudes Models for Light-Cone Meson Distribution Amplitudes

2005-02-12

arxiv.org/abs/hep-ph/0502115v1

JHEP0506:063,2005

Physics

High Energy Physics

High Energy Physics - Phenomenology

19 pages, 10 figures

Scientific paper

10.1088/1126-6708/2005/06/063

Leading-twist distribution amplitudes (DAs) of light mesons like pi,rho etc. describe the leading nonperturbative hadronic contributions to exclusive QCD reactions at large energy transfer, for instance electromagnetic form factors. They also enter B decay amplitudes described in QCD factorisation, in particular nonleptonic two-body decays. Being nonperturbative quantities, DAs cannot be calculated from first principles, but have to be described by models. Most models for DAs rely on a fixed order conformal expansion, which is strictly valid for large factorisation scales, but not always sufficient in phenomenological applications. We derive models for DAs that are valid to all orders in the conformal expansion and characterised by a small number of parameters which are related to experimental observables.

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