K-Mesic Nuclei Versus eta -Mesic Nuclei

TL;DR

This paper compares K-mesic and eta-mesic nuclear states, explaining differences in binding energies and absorption behaviors through resonance mechanisms and phenomenological models.

Contribution

It provides a comparative analysis of K-mesic and eta-mesic nuclei, highlighting the role of resonance states and introducing a phenomenological model for eta-N interactions.

Findings

Large differences in binding energies explained by resonance positions

Broad ar K-mesic and narrow exteta-mesic states observed

Suppression of exteta absorption in light nuclei explained

Abstract

The nuclear states of \bar K and \eta are bound by a similar mechanism - the excitations of nucleons to \Lambda (1405) and N*(1535) resonant states. The observed large differences in binding energies are understood in terms of separation of the involved energies and the resonance positions. The other experimental findings: broad \bar K-mesic and narrow \eta -mesic states are more difficult to understand. A phenomenological model for \eta -N interactions is used to explain the suppression of the \eta absorption in light nuclei.