Dynamically generated resonances from the vector meson-octet baryon interaction in the strangeness zero sector

TL;DR

This paper models vector meson-octet baryon interactions to dynamically generate and identify baryon resonances, predicting new states and explaining known resonances through coupled-channel analysis.

Contribution

It introduces a comprehensive calculation of interaction potentials including tensor interactions and solves coupled-channel equations to generate and analyze baryon resonances in the strangeness zero sector.

Findings

Several known resonances are reproduced and identified with pole structures.

New resonance states are predicted, including a J^P=1/2^- state around 2000 MeV.

The model suggests possible experimental observations for some unconfirmed resonances.

Abstract

The interaction potentials between vector mesons and octet baryons are calculated explicitly with a summation of t-, s-, u-channel diagrams and a contact term originating from the tensor interaction. Many resonances are generated dynamically in different channels of strangeness zero by solving the coupled-channel Lippman-Schwinger equations with the method of partial wave analysis, and their total angular momenta are determined. The spin partners N(1650)1/2^{-} and N(1700)3/2^-, N(1895)1/2^{-} and N(1875)3/2^-, and the state N(2120)3/2^- are all produced respectively in the isospin I=1/2 sector. In the isospin I=3/2 sector, the spin partners Delta(1620)1/2^- and Delta(1700)3/2^- are also associated with the pole in the complex energy plane. According to the calculation results, a J^P=1/2^- state around 2000 MeV is predicted as the spin partner of N(2120)3/2^-. Some resonances are well fitted with their counterparts listed in the newest review of Particle Data Group(PDG), while others might stimulate the experimental observation in these energy regions in the future.