Partial wave analysis of (γ/π)N → ηN reactions within a coupled channel unitary Lagrangian approach*
Institut für Theoretische Physik I, Universität Giessen
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The recent Crystal Ball measurements of the eta-meson photoproduction on the proton are analyzed within an unitary coupled-channel Lagrangian approach. The dip observed in the reaction cross section at 1.68 GeV is explained in terms of the interference between the S11(1535) and S11(1650) states. Additional contributions from the P11 partial wave are also important. No strong indication for the narrow P11 state with a width of 15 MeV is found. Predictions for the double-spin asymmetry Cz are presented and discussed.
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