2024/09/12 by Zhong, Hui-Hua, Liu, Ming-Sheng, Ni, Ru-Hui +3
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph) #Nuclear Experiment (nucl-ex) #Nuclear Theory (nucl-th)
paper · doi:10.48550/arxiv.2409.07998
In this work we systematically study both the mass spectra and strong decays of the nucleon and Δ resonances up to the N=2 shell within a unified quark model framework with chiral dynamics. In this framework we achieve a good description of the strong decay properties of the well-established nucleon and Δ resonances. Meanwhile, the mass reversal between N(1440)1/2+ as the first radial excitation state and the 1P-wave nucleon resonances can be explained. We show that the three-body spin-orbit potential arising from the one-gluon exchange can cause a large configuration mixing between N(1520)3/2- and N(1700)3/2-, and is also responsible for the large splitting between Δ(1600)1/2- and Δ(1700)3/2-. Some of these baryon resonances turn to weakly couple to the Nπ, Nη, KΛ, and KΣ channels, which may answer the question why they have not been established in these channels via the πN and γN scatterings. It shows that these ``missing resonances" may have large potentials to be established in the Nππ final state due to their large decay rates into either the Δ(1232) or 1P-wave nucleon resonances via the pionic decays. Further experimental search for their signals in charmonium decays at BESIII is thus strongly recommended.