First Measurement of the $\Sigma$ Beam Asymmetry in ${\eta }^{\prime }$ Photoproduction off the Proton near Threshold

Abstract

The $\Sigma$ beam asymmetry in ${\eta }^{\prime }$ photoproduction off the proton was measured at the GrAAL polarised photon beam with incoming photon energies of 1.461 and 1.480 GeV. For both energies the asymmetry as a function of the meson production angle shows a clear structure, more pronounced at the lowest one, with a change of sign around 90${}^o$. The observed behaviour is compatible with P-wave D-wave (or S-wave F-wave) interference, the closer to threshold the stronger. The results are compared to the existing state-of-the-art calculations that fail to account for the data.

6 pages, 4 figures, accepted for publication on Eur. Phys. J A

References in corpus (5)

• Big-Bang Nucleosynthesis
• Progress Toward Understanding Baryon Resonances
• Measurement of eta photoproduction on the proton from threshold to 1500 MeV
• Combined analysis of eta' production reactions: gamma N -> eta' N, N N -> N N eta', and pi N -> eta' N
• Study of excited nucleons and their structure

Cited by in corpus (17)

• Etaprime and Eta Mesons with Connection to Anomalous Glue
• Light Baryon Spectroscopy
• Study of $\eta$ and ${\eta }^{\prime }$ photoproduction at MAMI
• Photoproduction Reactions and Non-Strange Baryon Spectroscopy
• Eta and Etaprime Photoproduction on the Nucleon with the Isobar Model EtaMAID2018
• Photon beam asymmetry $\Sigma$ for $\eta$ and ${\eta }^{\prime }$ photoproduction from the proton
• Proton-${\eta }^{\prime }$ interactions at threshold
• Beam Asymmetry $\mathbf{\Sigma }$ for the Photoproduction of $\eta$ and ${\eta }^{\prime }$ Mesons at ${\mathbf{E}}_{\gamma }=8.8$GeV
• $N^{\ast }\to N{\eta }^{\prime }$ decays from photoproduction of ${\eta }^{\prime }$-mesons off protons
• Photoproduction of $\eta$ and ${\eta }^{\prime }$ Mesons on Proton
• On the spin-observables in pseudoscalar meson photoproduction
• Analysis of the differential cross section and photon beam asymmetry data for $\gamma p\to {\eta }^{\prime }p$
• Effect of the final state interaction of ${\eta }^{\prime }N$ on the ${\eta }^{\prime }$ photoproduction off nucleon
• Comprehensive measurement of ${\eta }^{\prime }$ photoproduction off the proton at $E_{\gamma }<2.4$ $\mathrm{GeV}$
• First observation of the $\gamma$-ray beam production by the backward Compton scattering of reflected synchrotron radiation in the extreme ultraviolet range
• Backward-angle electroproduction of ${\eta }^{\prime }$ mesons off protons at $W=2.13\text{GeV}$ and $Q^2=0.46{\left(\text{GeV}/c\right)}^2$
• Beam Asymmetries ($\Sigma$) for ${\pi }^0$, $\eta$ and ${\eta }^{\prime }$ in Photoproduction at GlueX