Abstract
The CGLN and BL theories of the pion photoproduction on nucleons, used in nuclear calculations, are examined regarding their predictions of the resonant M 1+ and E 1+ multipoles. The nonunitary BL approach violates Watson's theorem, and predicts these multipoles poorly. In the static limit, the CGLN multipoles satisfy Watson's theorem and are in fine agreement with data. The unitarized BL multipoles agree with those from the Olsson theory and data.
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