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 A^n_1/2 / A^p_1/2, 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.

4 figures. It will be published in Phys. Lett. B

References in corpus (4)

• Quasi-Two-Body Decays of Nonstrange Baryons
• Baryon Current Matrix Elements in a Light-Front Framework
• Effective Lagrangian Approach to the Theory of Eta Photoproduction in the $N^{\ast }(1535)$ Region
• The $\eta$NN Coupling in Eta Photoproduction

Cited by in corpus (13)

• Study of Non-Strange Baryon Resonances with Meson Photoproduction
• eta-photoproduction in the resonance energy region
• Strong decays of qqq baryons
• Transition form factors of the N*(1535) as a dynamically generated resonance
• Photoproduction of eta meson within a coupled-channels K-matrix approach
• Model-Independent Extraction of the N*(1535) Electrostrong Form Factor from Eta Electroproduction
• Coherent eta-photoproduction from nuclei in a relativistic impulse approximation approach
• Nuclear dependence of the coherent eta photoproduction reaction in a relativistic approach
• Coherent Photoproduction of eta-mesons on Three-Nucleon Systems
• Rescattering effects in coherent eta-photoproduction on the deuteron
• Quasifree eta photoproduction from nuclei and medium modifications of resonances
• Photo- and Electron-Production of Mesons on Nucleons and Nuclei
• Irreducible tensor approach to spin observables in photo production of mesons with arbitrary spin-parity $s^{\pi }$