Study of exotic hadrons in S-wave scatterings induced by chiral interaction in the flavor symmetric limit
- Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502 (Japan)
We study s-wave bound states of a hadron and a light pseudoscalar meson induced by the Weinberg-Tomozawa (WT) interaction in the flavor SU(3) symmetric limit. The WT interaction is a driving force to generate quasibound states dynamically in the chiral unitary approaches. The strength and sign of the WT interaction are determined only by the group theoretical structure of the target hadrons, and we present a general expression of the strengths for the flavor SU(3) case. We show that, for the channels which are more exotic than the target, the interaction is repulsive in most cases, and the strength of the attractive interaction is universal for any possible target states. We demonstrate that the attractive coupling is not strong enough to generate an exotic state from the physically known masses of target hadrons. In addition, we also find a nontrivial N{sub c} dependence of the coupling strengths. We show that the channels which are attractive at N{sub c}=3 change into repulsive ones for large N{sub c}, and, therefore, no attractive interaction exists in exotic channels in the large-N{sub c} limit.
- OSTI ID:
- 21010978
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 75, Issue 3; Other Information: DOI: 10.1103/PhysRevD.75.034002; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
Similar Records
Large N{sub c} Weinberg-Tomozawa interaction and negative parity s-wave baryon resonances
Low-lying even-parity meson resonances and spin-flavor symmetry