Comprehensive measurement of ${\eta }^{\prime }$ photoproduction off the proton at $E_{\gamma }<2.4$ $\mathrm{GeV}$

Abstract

For the spectroscopy of nucleon resonances at the total energies from the ${\eta }^{\prime }$-meson production threshold to $2.32$ $\mathrm{GeV}$, photon beam asymmetries of the reaction $\gamma p\to {\eta }^{\prime }p$ were measured together with total and differential cross sections by analyzing the two decay modes ${\eta }^{\prime }\to \gamma \gamma$ and ${\pi }^0{\pi }^0\eta$. New constraints for amplitude decomposition were given by the first-time result of photon beam asymmetries at $E_{\gamma }>1.84$ $\mathrm{GeV}$ and the most precise data of differential cross sections to date at extremely backward ${\eta }^{\prime }$ angles. The possibility of a larger coupling constant of the ${\eta }^{\prime }$-nucleon system to the $N(2250)$ resonance was implied in the partial wave analyses using the present data.

arXiv comment7 pages, 5 figures

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