Backward-angle electroproduction of ${\eta }^{\prime }$ mesons off protons at $W=2.13\text{GeV}$ and $Q^2=0.46{\left(\text{GeV}/c\right)}^2$

Abstract

The electroproduction of ${\eta }^{\prime }$ mesons from a ${}^1\mathrm{H}$ target at $W=2.13\text{GeV}$, $Q^2=0.46{\left(\text{GeV}/c\right)}^2$ and $\cos {\theta }_{{\gamma }^{\ast }{\eta }^{\prime }}^{\text{CM}}\approx -1$ has been experimentally measured. The differential cross section of virtual-photoproduction has been obtained as $4.4\pm 0.8\left(\text{stat.}\right)\pm 0.4\left(\text{sys.}\right)\text{nb/sr}$ in the One-Photon-Exchange Approximation. This value is one-sixth of that of real-photoproduction at backward angles. A comparison with newly-developed isobar model calculations not only shows validity of the theoretical framewark employed, but also imposes new constrains on coupling strength between the ${\eta }^{\prime }p$ final state and nucleon resonances.

27 pages, 9 figures

References in corpus (11)

• η- and η'-mesic nuclei and U_A(1) anomaly at finite density
• Data analysis techniques, differential cross sections, and spin density matrix elements for the reaction $\gamma p\to \varphi p$
• Analysis of U${}_A$(1) symmetry-breaking and restoration effects on the scalar-pseudoscalar spectrum
• High Resolution Spectroscopy of 12B_Lambda by Electroproduction
• The experiments with the High Resolution Kaon Spectrometer at JLab Hall C and the new spectroscopy of ${}_{\Lambda }^{12}\text{B}$ hypernuclei
• Momentum dependence of the imaginary part of the $\omega$- and ${\eta }^{\prime }$-nucleus optical potential
• Spectroscopy of Lambda-9Li by electroproduction
• Search for ${\eta }^{\prime }$ bound nuclei in the ${}^{12}\mathrm{C}(\gamma ,p)$ reaction with simultaneous detection of decay products
• Model selection for $K^{+}{\Sigma }^{-}$ photoproduction within isobar model
• The cross-section measurement for the ${}^3\text{H}(e,e^{\prime }{K}^{+})nn\Lambda$ reaction
• ${\eta }^{\prime }$ meson under partial restoration of chiral symmetry in nuclear medium