The \bar K N and \eta N dynamics at energies near threshold

Ales Cieply (Rzez)

Abstract:

We analyze the \bar K N and \eta N interactions using an effective separable potential coupled channels model that implements chiral symmetry. The energy dependence of both the \bar K N and \eta N scattering amplitudes is strongly affected by dynamically generated resonances close to the meson-baryon thresholds, the \Lambda(1405) and N*(1535), respectively. We discuss the relation of the observed energy dependence to the resonance pole dynamics in a free space and in nuclear medium. The model predicts an \eta N stattering length \Re a_{\eta N} \approx 0.7 fm and in-medium subthreshold attraction most likely sufficient to generate \eta-nuclear bound states, similar to those predicted for the \bar K}-nuclear interactions.