Chiral dynamics, structure of Lambda(1405), and Kbar N phenomenology

TL;DR

This paper explores the structure of the Lambda(1405) resonance and Kbar N interactions using chiral SU(3) dynamics, providing evidence for a meson-baryon molecular nature and emphasizing the role of pi Sigma interactions.

Contribution

It offers a comprehensive analysis of Lambda(1405) structure through multiple approaches within chiral dynamics, supporting the meson-baryon molecule interpretation.

Findings

Lambda(1405) is best described as a meson-baryon molecule.

Strong pi Sigma interaction plays a crucial role in Kbar N phenomenology.

Chiral dynamics explains the properties of the antikaon bound states in nuclei.

Abstract

We investigate the structure of the Lambda(1405) resonance and Kbar N phenomenology in the perspective of chiral SU(3) dynamics. Utilizing the chiral coupled-channel approach which well describes the Kbar N scattering observable, we perform three different analyses to clarify the structure of the Lambda(1405) resonance. The results consistently indicate the meson-baryon molecule picture of the Lambda(1405). We argue the consequence of the chiral dynamics in Kbar N phenomenology and the antikaon bound state in nucleus, emphasizing the important role of the strong pi Sigma interaction.