Year: 2024
Type: article
Abstract: 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 1 P -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 tend to weakly couple to the N π , N η , K Λ , and K Σ channels, which may answer the question of why they have not been established in these channels via the π N and γ N scatterings. It shows that these “missing resonances” may have large potentials to be established in the N π π final state due to their large decay rates into either the Δ ( 1232 ) or 1 P -wave nucleon resonances via the pionic decays. Further experimental search for their signals in charmonium decays at BESIII is thus strongly recommended. Published by the American Physical Society 2024
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
OpenAlex ID: W4405911701