A dispersive approach to pion photo- and electroproduction

Details A dispersive approach to pion photo- and electroproduction A dispersive approach to pion photo- and electroproduction

2007-12-04

arxiv.org/abs/0712.0572v1

FewBodySyst.41:13-29,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

18 pages, 10 figures, Proc. Yang Fest, Taipei, June 2007

Scientific paper

10.1007/s00601-007-0184-4

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.

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