η photoproduction in the resonance energy region

The eta production in the nucleon resonance energy region is studied within the unitary coupled-channels effective Lagrangian approach of the Giessen model. We demonstrate that the second peak recently observed in the cross section of eta photoproduction on the neutron at root s = 1.66 GeV can be explained in terms of coupled-channel effects due to S-11 (1650) and P-11 (1710) resonance excitations. (C) 2007 Elsevier B.V. All rights reserved.