Extraction of the Ratio of the N*(1535) Electromagnetic Helicity Amplitudes from Eta Photoproduction off Neutrons and Protons
Abstract
Using the recent precise measurements of eta photopro- duction in proton and deuteron targets, we extract the ratio of the helicity amplitudes An1/2 / Ap1/2, for the excitation of N*(1535), in the effective Lagrangian approach, It is fairly model-independent, free from the final-state interaction effects, and negative as predicted by the quark models. We stress the importance of polarization observables in further elucidation of the N*(1520) photoexcitation amplitudes.
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