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We investigate the importance of crossing symmetry in effective field modelsand the effects of phenomenological nucleon resonance widths on theparadigmatic case of pion photoproduction. We use reaction models containingfour star resonances up to 1.8 Gev ($\Delta$(1232), N(1440), N(1520), N(1535),$\Delta$(1620), N(1650), $\Delta$(1700), and N(1720)) with differentprescriptions for crossed terms and widths, to fit the latest world database onpion photoproduction. We compare $\chi^2$ results from selected multipoles andfits. The $\chi^2$ is highly dependent on the fulfillment of crossing symmetryand the inclusion of $u$ channels.

Crossing symmetry and phenomenological widths in effective Lagrangian models of the pion photoproduction process