Covariant model for theγN→N(1535)transition at high momentum transfer

Abstract

A relativistic constituent quark model is applied to the $\ensuremath{\gamma}N\ensuremath{\rightarrow}N(1535)$ transition. The $N(1535)$ wave function is determined by extending the covariant spectator quark model, previously developed for the nucleon, to the ${S}_{11}$ resonance. The model allows us to calculate the valence quark contributions to the $\ensuremath{\gamma}N\ensuremath{\rightarrow}N(1535)$ transition form factors. Because of the nucleon and $N(1535)$ structure the model is valid only for ${Q}^{2}>2.3\text{ }\text{ }{\mathrm{GeV}}^{2}$. The results are compared with the experimental data for the electromagnetic form factors ${F}_{1}^{*}$ and ${F}_{2}^{*}$ and the helicity amplitudes ${A}_{1/2}$ and ${S}_{1/2}$, at high ${Q}^{2}$.