Origin of resonances in the chiral unitary approach

Abstract

We study the origin of the resonances associated with pole singularities of the scattering amplitude in the chiral unitary approach. We propose a "natural renormalization" scheme using the low-energy interaction and the general principle of the scattering theory. We develop a method to distinguish dynamically generated resonances from genuine quark states [Castillejo-Dalitz-Dyson (CDD) poles] using the natural renormalization scheme and phenomenological fitting. Analyzing physical meson-baryon scatterings, we find that the Lambda(1405) resonance is largely dominated by the meson-baryon molecule component. In contrast, the N(1535) resonance requires a sizable CDD pole contribution, while the effect of the meson-baryon dynamics is also important.

RevTeX4, 14 pages, 4 figures, 4 tables, title changed by editors, final version to appear in Phys. Rev. C

References in corpus (5)

• Effective Kbar N interaction based on chiral SU(3) dynamics
• Transition form factors of the N*(1535) as a dynamically generated resonance
• Structure of the Lambda(1405) baryon resonance from its large Nc behavior
• How and when can one identify hadronic molecules in the baryon spectrum
• Study of exotic hadrons in s-wave chiral dynamics

Cited by in corpus (5)

• K anti-K N molecule state with I=1/2 and J^P=1/2^+ studied with three-body calculation
• anti-K anti-K N molecule state in three-body calculation
• Electromagnetic mean squared radii of Lambda(1405) in chiral dynamics
• On the nature of the $\Lambda (1405)$ and $\Lambda (1670)$ from their $N_c$ behavior in chiral dynamics
• The structure of N(1535) in the aspect of chiral symmetry