Beam Asymmetry $\mathbf{\Sigma }$ for the Photoproduction of $\eta$ and ${\eta }^{\prime }$ Mesons at ${\mathbf{E}}_{\gamma }=8.8$GeV

Abstract

We report on the measurement of the beam asymmetry $\Sigma$ for the reactions $\vec{\gamma }p\to p\eta$ and $\vec{\gamma }p\to p{\eta }^{\prime }$ from the GlueX experiment, using an 8.2--8.8 GeV linearly polarized tagged photon beam incident on a liquid hydrogen target in Hall D at Jefferson Lab. These measurements are made as a function of momentum transfer $-t$, with significantly higher statistical precision than our earlier $\eta$ measurements, and are the first measurements of ${\eta }^{\prime }$ in this energy range. We compare the results to theoretical predictions based on $t$--channel quasi-particle exchange. We also compare the ratio of ${\Sigma }_{\eta }$ to ${\Sigma }_{{\eta }^{\prime }}$ to these models, as this ratio is predicted to be sensitive to the amount of $s\bar{s}$ exchange in the production. We find that photoproduction of both $\eta$ and ${\eta }^{\prime }$ is dominated by natural parity exchange with little dependence on $-t$.

arXiv comment18 pages, 7 figures

References in corpus (16)

• Measurement of eta photoproduction on the proton from threshold to 1500 MeV
• Measurement of the beam asymmetry in eta-photoproduction off the proton
• Measurement of the beam asymmetry $\Sigma$ for ${\pi }^0$ and $\eta$ photoproduction on the proton at $E_{\gamma }=9$ GeV
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• Toward Complete Pion Nucleon Amplitudes
• The GlueX Start Counter Detector
• The Primakoff effect on a proton target
• Design and construction of a high-energy photon polarimeter
• The GlueX Central Drift Chamber: Design and Performance
• Unitarity constraints on neutral pion electroproduction
• A measurement of the energy and timing resolution of GlueX Forward Calorimeter using an electron beam
• Regge phenomenology in ${\pi }^0$ and $\eta$ photoproduction
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Cited by in corpus (13)

• The GlueX Beamline and Detector
• Novel approaches in Hadron Spectroscopy
• Strange Hadron Spectroscopy with Secondary KL Beam in Hall D
• Measurement of Spin-Density Matrix Elements in $\rho (770)$ Production with a Linearly Polarized Photon Beam at $E_{\gamma }=8.2-8.8\text{GeV}$
• Moravcsik's theorem on complete sets of polarization observables reexamined
• Search for axion-like particles through nuclear Primakoff production using the GlueX detector
• Measurement of beam asymmetry for ${\pi }^{-}{\Delta }^{++}$ photoproduction on the proton at $E_{\gamma }$=8.5 GeV
• Measurement of the Photon Beam Asymmetry in $\vec{\gamma }p\to K^{+}{\Sigma }^0$ at $E_{\gamma }=8.5$ GeV
• Photoproduction of $\eta$ mesons off the proton for $1.2<E_{\gamma }<4.7$ GeV using CLAS at Jefferson Laboratory
• Analysis of the differential cross section and photon beam asymmetry data for $\gamma p\to {\eta }^{\prime }p$
• Pseudoscalar and Scalar Meson Photoproduction Interpreted by Regge Phenomenology
• High-energy ${\eta }^{(\prime )}\pi$ photoproduction and the nature of exotic waves
• New graphical criterion for the selection of complete sets of polarization observables and its application to single-meson photoproduction as well as electroproduction