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Differential cross sections for eta photoproduction off protons have beenmeasured at E_gamma = 1.6 - 2.4 GeV in the backward direction. A bump structurehas been observed above 2.0 GeV in the total energy. No such bump is observedin cross sections for eta', omega and pi0 photoproductions. It is inferred thatthis unique structure in eta photoproduction is due to a baryon resonance witha large portion of ss-bar strongly coupled to the etaN channel.

Backward-angle photoproduction of eta meson from protons at E_gamma = 1.6 - 2.4 GeV