2003/05/08 by K. Naito, Kenichi Naito, Makoto Oka +3 · 1 citation
Physics and Astronomy · #Chiral symmetry breaking #Hadron #High-Energy Particle Collisions Research #Meson #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Rho meson #Scalar (mathematics) #Scalar meson #Strangeness #Symmetry breaking #hep-ph
paper · pdf · doi:10.1143/ptp.109.969
published as Prog.Theor.Phys. 109 (2003) 969-980 · 10 pages, 3 figures
arxiv created 2003/05/08 · openalex publication_date 2003/06/01 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Effects of the UA(1) breaking interaction on the low-lying nonet scalar mesons are studied using the extended Nambu-Jona-Lasinio model. The strength of the UA(1) breaking interaction is determined by the electromagnetic decays of the η meson. We find that the UA(1) breaking interaction gives rise to about 150 MeV mass difference between the σ and a0 mesons. We also find that the strangeness content in the σ meson is about 15%. The calculated mass of the I = 1/2 state is about 200 MeV heavier than that of the I = 1 state. The order of these masses is not likely to change within this model.