Measurement of eta photoproduction on the proton from threshold to 1500 MeV

TL;DR

This paper reports measurements of beam asymmetry and differential cross sections for eta photoproduction on protons from threshold to 1500 MeV, comparing results with models and investigating narrow resonance states.

Contribution

The study provides new experimental data on eta photoproduction and compares multiple models, highlighting differences in resonance contributions and searching for narrow N(1670) states.

Findings

Data agree with previous measurements

Models fit the data but differ in resonance contributions

No evidence found for narrow N(1670) state

Abstract

Beam asymmetry and differential cross section for the reaction gamma+p->eta+p were measured from production threshold to 1500 MeV photon laboratory energy. The two dominant neutral decay modes of the eta meson, eta->2g and eta->3pi0, were analyzed. The full set of measurements is in good agreement with previously published results. Our data were compared with three models. They all fit satisfactorily the results but their respective resonance contributions are quite different. The possible photoexcitation of a narrow state N(1670) was investigated and no evidence was found.