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Photoproduction of $\eta$ -mesons on protons in the resonance region: The background problem and the third S 11-resonance

“…2. It must be emphasized that the model including eleven [12] resonances agrees with the experimental results at these energies as good as the low energy model [11] with six resonances. Furthermore, we would like to note that the maxima in Σ(θ) for K 0 > 950 MeV appear at the same angles (θ ≈ 50 0 ) as does the maxima of dσ/dΩ at the corresponding energies.…”

“…In the same figure we also demonstrate the sensitivity of T (θ) to the contribution of the P 13 (1720) and D 15 (1675) resonances. It must also be noted, that the model of [11] (the result is shown by the doted curve) was in disagreement with the experimental results. At the same time, we could not describe the experimental data of work [17] on the target asymmetry of process (1) for the photon lab energy below 750 MeV by using the resonances from table 1.…”

“…They were discussed in our previous work [11] and are not presented here. With increasing energy the theoretical distributions dσ/dΩ exhibit pronounced decrease at forward angles (see also Ref.…”

“…Doted curve is the result of the Ref. [11]. The data are from [14] (open circles) and [15] (filled circles).…”

“…The prediction of the present model is shown by the solid curve. Doted curve is the result of the Ref [11]…”