Instantons, Chiral Dynamics and Hadronic Resonances

Abstract

We use the Interacting Instanton Liquid Model (IILM) as a tool to study the role played by the chiral interactions in the lowest-lying vector and axial vector meson resonances. We find that narrow a1 and rho meson resonances can be generated by instanton-induced chiral forces, even in the absence of confinement. In the IILM, these hadrons are found to have masses only about 30% larger than the experimental value and small width <10-50 MeV. This result suggests that chiral interactions are very important in these systems and provide most of their mass. We explore the decaying patterns of the rho meson, in the absence of confinement. We argue that, in our model where only chiral forces are switched on, this meson decays dissociating into its quark anti-quark constituents.

References in corpus (18)

• Instantons in QCD
• Evidence for the Role of Instantons in Hadron Structure from Lattice QCD
• Mesonic Correlation Functions in the Random Instanton Vacuum
• Low-lying fermion modes, topology and light hadrons in quenched QCD
• The instanton liquid in QCD at zero and finite temperature
• The strong coupling constant at small momentum as an instanton detector
• Evidence for Instanton-Induced Dynamics, from Lattice QCD
• Testing the self-duality of topological lumps in SU(3) lattice gauge theory
• Properties of near-zero modes and chiral symmetry breaking
• Are There Diquarks in the Nucleon?
• Instanton Contribution to the Pion Electro-Magnetic Formfactor at Q^2 > 1 GeV^2
• Exploring the Chiral Regime of QCD in the Interacting Instanton Liquid Model
• Confinement from Instantons or Merons
• Instantons, diquarks and non-leptonic weak decays of hyperons
• Proton Electro-Magnetic Form-Factors in the Instanton Liquid Model
• Instanton Contribution to the Electro-Magnetic Form Factors of the Nucleon
• Instanton Contribution to the Proton and Neutron Electric Form Factors
• Instanton-Induced Correlations in Hadrons

Cited by in corpus (5)

• QCD Topology at Finite Temperature: Statistical Mechanics of Selfdual Dyons
• Influence of Meson's Widths on Yukawa-like Potentials and Lattice Correlation Functions
• Computing the Effective Hamiltonian of Low-Energy Vacuum Gauge Fields
• Quantum Interactions Between Non-Perturbative Vacuum Fields
• Instanton fermionic zero mode at finite temperature and chemical potential