A dispersive approach to pion photo- and electroproduction

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

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High Energy Physics - Phenomenology

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http://salesiana.dossiersoluciones.com/handle/123456789/191763

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/0712.0572
 http://arxiv.org/abs/0712.0572
 FewBodySyst.41:13-29,2007
 doi:10.1007/s00601-007-0184-4

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arXiv