Intriguing aspects of light baryon resonances

¹ Universidade Federal de São Paulo, C.P. 01302-907, São Paulo, Brazil.
² Universidade de Sao Paulo, Instituto de Fisica, C.P. 05389-970, São Paulo, Brazil.
³ Department of Physics and Origin of Matter and Evolution of Galaxies (OMEG) Institute, Soongsil University, Seoul 06978, Korea.
⁴ Department of Physics, Pukyong National University (PKNU), Center for Extreme Nuclear Matters (CENuM), Busan 48513, Korea.
⁵ Research Center for Nuclear Physics (RCNP), Osaka University, Ibaraki, Osaka, 567-0047, Japan.
⁶ Department of Physics, Nara Women’s University, Nara 630-856, Japan

^* e-mail: kanchan.khemchandani@unifesp.br
^** e-mail: amartine@if.usp.br

Published online: 7 August 2024

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 s₁₁, 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 πN. 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.