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Revised analysis of $\Sigma$ beam asymmetry for the $\eta$ photoproduction onthe free proton reveals a structure at $W\sim 1.69$ GeV. Fit of theexperimental data based on the E429 solution of the SAID partial wave analysissuggests a narrow ($\Gamma \leq 25$ MeV) resonance. Possible candidates are$P_{11}, P_{13}$, or $D_{13}$ resonances. The result is considered inconjunction with the recent evidence for a bump-like structure at $W\sim 1.67 -1.68$ GeV in the quasi-free $\eta$ photoproduction on the neutron.

Photoproduction off the nucleon revisited: Evidence for a narrow N(1688) resonance?