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The reactions $\gamma p\to \eta p$ and $\gamma p\to \eta' p$ have beenmeasured from their thresholds up to the center-of-mass energy $W=1.96$GeV withthe tagged-photon facilities at the Mainz Microtron, MAMI. Differential crosssections were obtained with unprecedented accuracy, providing fine energybinning and full production-angle coverage. A strong cusp is observed in thetotal cross section and excitation functions for $\eta$ photoproduction at theenergies in vicinity of the $\eta'$ threshold, $W=1896$MeV($E_\gamma=1447$MeV). This behavior is explained in a revised $\eta$MAID isobarmodel by a significant branching of the $N(1895)1/2^-$ nucleon resonance toboth, $\eta p$ and $\eta' p$, confirming the existence and constraining theproperties of this poorly known state.

Study of $\eta$ and $\eta'$ photoproduction at MAMI