A dispersive approach to pion photo- and electroproduction

Abstract

The relativistic amplitudes of pion photo- and electroproduction are calculated by dispersion relations at constant t. Several sum rules and low-energy theorems for the threshold amplitudes are investigated within this technique. The continuation of the amplitudes to sub-threshold kinematics is shown to provide a unique framework to derive the low-energy constants of chiral perturbation theory by global properties of the excitation spectrum.

arXiv comment18 pages, 10 figures, Proc. Yang Fest, Taipei, June 2007

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Cited by in corpus (3)

• Photo- and Electrocouplings of Nucleon Resonances
• Near-threshold ${\pi }^{-}$ photoproduction on the deuteron
• Aspects of QCD Current Algebra on a Null Plane