Chirally motivated separable potential model for $ηN$ amplitudes

We analyze the $ηN$ interaction using a coupled channel separable potential model that implements the chiral symmetry. The model predicts an $ηN$ stattering length $\Re a_{ηN} \approx 0.7$ fm and in-medium subthreshold attraction most likely sufficient to generate $η$-nuclear bound states. The energy dependence of the $ηN$ amplitude and pole content of the model are discussed. An idea of the same origin of the baryon resonances $N^{\star}(1535)$ and $N^{\star}(1650)$ is presented.

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