Intriguing aspects of light baryon resonances

TL;DR

This paper explores light baryon resonances that challenge the traditional three-quark model, highlighting specific states and decay behaviors that suggest more complex internal structures influenced by hadron dynamics.

Contribution

It identifies baryon resonances requiring descriptions beyond the quark model, emphasizing the role of hadron-hadron interactions in their properties.

Findings

Certain light baryon resonances cannot be explained by the three-quark model.

The N* resonance decays to hyperon states with widths comparable to πN decays.

Resonance properties are linked to strong hadron-hadron dynamics.

Abstract

We discuss that some light baryon resonances exhibit properties which cannot be described when attributing a three-valence quark structure to them. Besides pointing out the hadron resonances which clearly require description beyond the quark model, we focus on the third $s_{11},~ N^*$ state and its decay to final states consisting of the lightest hyperon resonances which have a partial width comparable to that for the decay to $\pi N$. Such properties of the mentioned nucleon resonance get manifested in the cross sections and other observables related to processes producing the lightest hyperon resonances. We show that all these findings arise from the strong association of the baryon resonances to the dynamics among the ground-state hadrons.