Instantons, chiral dynamics, and hadronic resonances

Journal Article · Thu Mar 01 04:00:00 EST 2007 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.75.054024· OSTI ID:21020071

Cristoforetti, M; Faccioli, P; Traini, M ^[1]

---

1. Dipartimento di Fisica and INFN, Universita degli Studi di Trento, Via Sommarive 15, Povo, Trento 38050 (Italy) and European Centre for Theoretical Studies in Nuclear Physics and Related Areas, Strada delle Tabarelle 286, Villazzano, Trento, I-38050 (Italy)

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 a{sub 1} 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 < or approx. 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-antiquark constituents.

• OSTI ID: 21020071
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 5 Vol. 75; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
AXIAL VECTOR MESONS
CHIRALITY
INSTANTONS
PARTICLE DECAY
PARTICLE MODELS
PARTICLE WIDTHS
RESONANCE PARTICLES
REST MASS