Photoproduction of $\eta$ and $\eta\prime$ Mesons off Protons

TL;DR

This paper reports new measurements of total and differential cross sections for eta and eta prime meson photoproduction off protons, covering a broad energy and angular range, using the CBELSA/TAPS detector, providing valuable data for understanding meson production mechanisms.

Contribution

First comprehensive measurement of eta and eta prime photoproduction cross sections over full angular range with multiple decay modes at energies 0.85-2.55 GeV.

Findings

Consistent with previous CB-ELSA results for eta mesons.

Extended angular coverage for eta prime meson detection.

First full angular coverage in eta meson photoproduction.

Abstract

Total and differential cross sections for $\eta$ and $\eta ^\prime$ photoproduction off the proton have been determined with the CBELSA/TAPS detector for photon energies between 0.85 and 2.55 GeV. The $\eta$ mesons are detected in their two neutral decay modes, $\eta\to\gamma\gamma$ and $\eta\to 3\pi^0\to 6\gamma$, and for the first time, cover the full angular range in $\rm cos \theta_{cm}$ of the $\eta$ meson. These new $\eta$ photoproduction data are consistent with the earlier CB-ELSA results. The $\eta ^\prime$ mesons are observed in their neutral decay to $\pi^0\pi^0\eta\to 6\gamma$ and also extend the coverage in angular range.