(1232) Contribution in the π-photoproduction on Nucleons in Covariant Chiral Perturbation Theory
Abstract
We study the effects of the (1232) resonance as an effective degree of freedom for charged and neutral pion photo-production on nucleons. Different observables have been calculated for these processes by using relativistic chiral perturbation theory up to O(p3) in the δ counting, thus, including pion loops. We compare our model with a large database containing the available experimental data and constrain some unknown low energy constants.
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