Abstract
We investigate $\eta$ photoproduction off the neutron target, i.e., $\gamma n \to \eta n$, employing an effective Lagrangian method combining with a Regge approach. As a background, we consider nucleon exchange in the $s$-channel diagram and $\rho$- and $\omega$-meson Regge trajectories in the $t$ channel. The role of nucleon resonances given in the Review of Particle Data Group in the range of $W \approx 1500 - 2100$ MeV and the narrow nucleon resonance $N(1685,1/2^+)$ is extensively studied. The numerical results of the total and differential cross sections, double polarization observable $E$, and helicity-dependent cross sections $\sigma_{1/2}$, $\sigma_{3/2}$ are found to be in qualitative agreement with the recent A2 experimental data. The predictions of the beam asymmetry are also given.
Highlights
Photoproduction of mesons provides an essential tool to investigate excited baryons
We investigate η photoproduction off the neutron target, i.e., γn → ηn, employing an effective Lagrangian method combining with a Regge approach
The role of nucleon resonances given in the Review of Particle Data Group in the range of W ≈ 1500–2100 MeV and the narrow nucleon resonance Nð1685; 1=2þÞ is extensively studied
Summary
Η photoproduction plays a role of a filter for excited nucleon resonances, since η is a pseudoscalar and isoscalar meson, and it contains hidden strangeness. Only the selected number of the excited nucleon resonances can be exclusively studied, which can be only coupled to the η meson [1]. Starting from the ηN threshold, the total cross section of η photoproduction off the nucleon raises rapidly because of the dominant and broad excited nucleon resonance Nð1535; 1=2−Þ.
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