Study of N(1520) and N(1535) structures via $$\gamma ^*p\rightarrow N^*$$ transitions

Abstract

The helicity amplitudes of the N(1520) and N(1535) resonances in the $$\gamma ^*p\rightarrow N^*$$ electromagnetic transition are studied in the constituent quark model using the impulse approximation, with the proton and resonances assumed to be in three-quark configurations. The comparison of theoretical results and experimental data on the helicity amplitudes $$A_{1/2}$$ , $$A_{3/2}$$ , and $$S_{1/2}$$ indicates that the N(1520) and N(1535) resonances are primarily composed of three-quark $$L=1$$ states but may contain additional components. However, it is improbable that contributions from meson clouds will be dominant at low $$Q^2$$ .