Double and single pion photoproduction within a dynamical coupled-channels model

Details Double and single pion photoproduction within a dynamical coupled-channels model Double and single pion photoproduction within a dynamical coupled-channels model

2009-09-07

arxiv.org/abs/0909.1129v2

Phys.Rev.C80:065203,2009

Physics

Nuclear Physics

Nuclear Theory

Version to appear in PRC. 16 pages, 13 figures

Scientific paper

10.1103/PhysRevC.80.065203

Within a dynamical coupled-channels model which has already been fixed from analyzing the data of the pi N -> pi N and gamma N -> pi N reactions, we present the predicted double pion photoproduction cross sections up to the second resonance region, W< 1.7 GeV. The roles played by the different mechanisms within our model in determining both the single and double pion photoproduction reactions are analyzed, focusing on the effects due to the direct gamma N -> pi pi N mechanism, the interplay between the resonant and non-resonant amplitudes, and the coupled-channels effects. The model parameters which can be determined most effectively in the combined studies of both the single and double pion photoproduction data are identified for future studies.

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