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Elsevier, Nuclear Physics A, 4(600), p. 413-435

DOI: 10.1016/0375-9474(95)00492-0

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Double pion photoproduction on the nucleon: study of the isospin channels

Journal article published in 1995 by José Antonio Gómez Tejedor, Jag Tejedor ORCID, E. Oset
This paper is available in a repository.
This paper is available in a repository.

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Abstract

A model for the gamma p --- > pion+ pion- p reaction developed earlier is extended to account for all isospin channels. The model includes N, Delta(1232), N^*(1440) and N^*(1520) as intermediate baryonic states and the rho-meson as an intermediate two pion resonance. Although many terms contribute to the cross section, some channels exhibit particular sensitivity to certain mechanisms of resonance excitation or decay and the reactions provide novel information on such mechanisms. In particular the gamma N --- > N^*(1520) --- > Delta(1232) pion process affects all of the channels and is a key ingredient in the interpretation of the data. Comparison is made with all available data and the agreement is good in some of the channels. The remaining discrepancies is some other channels are discussed.