Study of $\eta$ and ${\eta }^{\prime }$ photoproduction at MAMI

Abstract

The reactions $\gamma p\to \eta p$ and $\gamma p\to {\eta }^{\prime }p$ have been measured from their thresholds up to the center-of-mass energy $W=1.96$GeV with the tagged-photon facilities at the Mainz Microtron, MAMI. Differential cross sections were obtained with unprecedented accuracy, providing fine energy binning and full production-angle coverage. A strong cusp is observed in the total cross section and excitation functions for $\eta$ photoproduction at the energies in vicinity of the ${\eta }^{\prime }$ threshold, $W=1896$MeV ($E_{\gamma }=1447$MeV). This behavior is explained in a revised $\eta$MAID isobar model by a significant branching of the $N(1895)1/2^{-}$ nucleon resonance to both, $\eta p$ and ${\eta }^{\prime }p$, confirming the existence and constraining the properties of this poorly known state.

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Cited by in corpus (35)

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• Precision tests of fundamental physics with $\eta$ and ${\eta }^{\prime }$ mesons
• Etaprime and Eta Mesons with Connection to Anomalous Glue
• Light Baryon Spectroscopy
• Photoproduction Reactions and Non-Strange Baryon Spectroscopy
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• Proton-${\eta }^{\prime }$ interactions at threshold
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• $N^{\ast }$ resonances from $K\Lambda$ amplitudes in sliced bins in energy
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• Moravcsik's theorem on complete sets of polarization observables reexamined
• Observation of a structure in the M${}_{p\eta }$ invariant mass distribution near 1700 MeV/$c^2$ in the $\gamma \mathbf{p}\to \mathbf{p}{\pi }^0\eta$ reaction
• Fixed-t analyticity as a constraint in single energy partial wave analyses of meson photoproduction reactions
• Differential cross sections and photon beam asymmetries of $\eta$ photoproduction on the proton at $E_{\gamma }$ = 1.3-2.4 GeV
• Measurement of the decay ${\eta }^{\prime }\to {\pi }^0{\pi }^0\eta$ at MAMI
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