A dispersive approach to pion photo- and electroproduction
High Energy Physics - Phenomenology
2008-11-26 v1
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.
Keywords
Cite
@article{arxiv.0712.0572,
title = {A dispersive approach to pion photo- and electroproduction},
author = {D. Drechsel and B. Pasquini and L. Tiator},
journal= {arXiv preprint arXiv:0712.0572},
year = {2008}
}
Comments
18 pages, 10 figures, Proc. Yang Fest, Taipei, June 2007