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Resonance model for pN scattering and ?-meson production in the S 11 channel

A model for πN scattering and η-meson production in the S 11 channel is presented. The model includes πN-scattering Born terms as well as the N * resonances S 11 (1535) and S 11 (1610). The T-matrix is computed in the K-matrix approximation. The parameters of the model are determined by fitting the elastic πN-scattering T-matrix to empirical data. We find an excellent fit for all energies up to √ s = 1.75 GeV. Furthermore, a good description of the cross section for π − + p → η + n is obtained without further adjustment of parameters.