Origin of resonances in chiral dynamics

Abstract

The nature of baryon resonances is studied in the dynamical chiral coupled-channel approach for meson-baryon scattering. In general, origin of resonances in two-body scattering can be classified into two categories: dynamically generated states and genuine elementary particles. We demonstrate that the genuine contribution in the loop function can be excluded by adopting a natural renormalization scheme. The origin of resonances can be studied by looking at the effective interaction in the natural renormalization scheme, which is deduced from the phenomenological amplitude fitted to experimental data. Applying this method to the baryon resonances, we find that the dominant component for the Lambda(1405) resonance is dynamical, while a genuine contribution plays a substantial role for the structure of the N(1535).

9 pages, 3 figures, Talk given at Chiral Dynamics 2009, July 6-10, 2009, University of Bern, Switzerland

References in corpus (7)

• Chiral Dynamics of the Two Λ(1405) States
• Effective Kbar N interaction based on chiral SU(3) dynamics
• Origin of resonances in the chiral unitary approach
• Flavor SU(3) breaking effects in the chiral unitary model for meson-baryon scatterings
• 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
• Structure of the Lambda(1405) baryon resonance from its large Nc behavior