Review on recent progress in the study of the N^*(920) subthreshold singularity and the σ/f₀(500) meson

2025/05/30 by Qu-Zhi Li, Li, Qu-Zhi, Zhiguang Xiao +3
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Lattice (hep-lat) #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Nuclear Theory (nucl-th) #Nuclear physics research studies #Quantum Chromodynamics and Particle Interactions

paper · doi:10.48550/arxiv.2505.24674

openalex publication_date 2025/05/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We summarize recent results on studies of ππ and πN scatterings. They include the finding of a negative-parity nucleon pole with a mass lower than the nucleon mass, and the pole trajectory of f₀(500) as the pion mass varies. The results are obtained from model-independent dispersion analyses. We also study the thermal properties of f₀(500) based on the O(N) σ model and N/D method.

Citations

• Dynamical coupled-channel models for hadron dynamics
• On the pole trajectory of the subthreshold negative parity nucleon with varying pion masses
• Rigorous Roy-Steiner equation analysis of πK scattering at unphysical quark masses
• Nuclear matter and finite nuclei: recent studies based on Parity Doublet Model
• Chiral Symmetry of Baryons

Related

• On the pole trajectory of the subthreshold negative parity nucleon with varying pion masses
• The N/D study on the singularity structure of πN scattering amplitudes
• Studies on quark-mass dependence of the N^*(920) pole from πN χPT amplitudes
• Sigma-Meson and Confinement Singularity
• Properties and composition of the f₀(500) resonance