Beam Asymmetries ($\Sigma$) for ${\pi }^0$, $\eta$ and ${\eta }^{\prime }$ in Photoproduction at GlueX

Abstract

The GlueX experiment is a photoproduction experiment located at Thomas Jefferson National Lab in Newport News, Virginia. GlueX is capable of making beam asymmetry ($\Sigma$) measurements using a tagged, linearly-polarized 9 GeV photon beam incident on a hydrogen target. Measurements of the beam asymmetry for the exclusive reactions $\gamma p\to {\pi }^{0}p$, $\gamma p\to \eta p$ and $\gamma p\to {\eta }^{\prime }p$ will provide insight into the meson production mechanisms. GlueX measurements are the first beam asymmetry results for the $\eta$ and ${\eta }^{\prime }$ in this energy range and are expected to further constrain Regge theory models for photoproduced pseudoscalar mesons. This talk will present preliminary results of the photon beam asymmetries as a function of the Mandelstam variable, t, for multiple $\eta$ decay modes and the ${\eta }^{\prime }\to {\pi }^{+}{\pi }^{-}\eta$ decay mode.

10 pages, 8 figures, proceedings for The 15th International Conference on Meson-Nucleon Physics and the Structure of the Nucleon (MENU-2019)