Meson-baryon nature of Lambda(1405) in chiral dynamics

TL;DR

This paper investigates the Lambda(1405) resonance's meson-baryon structure using chiral dynamics, proposing a natural renormalization scheme to clarify its origin and comparing it with N(1535).

Contribution

It introduces a natural renormalization scheme in chiral coupled-channel approach to better understand baryon resonance origins.

Findings

Lambda(1405) has a meson-baryon molecular structure.

The renormalization scheme reduces ambiguity in interaction modeling.

Comparison with N(1535) reveals structural differences.

Abstract

We present the recent progress in the study on the origin of baryon resonances in chiral dynamics. It is shown that in the chiral coupled-channel approach, the form of the interaction cannot be specified due to the cutoff of the loop integral. To avoid this ambiguity, we propose a natural renormalization scheme, which affords a clue to the origin of the resonance, together with the phenomenological fitting to experimental data. We study the structure of the Lambda(1405) resonance in comparison with the N(1535).