Lambda(1405) in chiral SU(3) dynamics

TL;DR

This paper explores the Lambda(1405) resonance using chiral SU(3) dynamics, deriving an effective interaction and analyzing its structure and behavior with respect to the number of colors, providing insights into its phenomenology.

Contribution

It introduces a single-channel KbarK N interaction based on chiral SU(3) coupled-channel approach and examines the resonance's structure and Nc dependence.

Findings

Emphasizes the role of the pi Sigma channel in Lambda(1405) structure

Derives an effective KbarK N interaction from chiral dynamics

Analyzes the Nc dependence of the resonance poles

Abstract

We discuss several aspects of the Lambda(1405) resonance in relation to the recent theoretical developments in chiral dynamics. We derive an effective single-channel KbarK N interaction based on chiral SU(3) coupled-channel approach, emphasizing the important role of the pi Sigma channel and the structure of the Lambda(1405) in Kbar N phenomenology. In order to clarify the structure of the resonance, we study the behavior with the number of colors (Nc) of the poles associated with the Lambda(1405), and argue the physical meaning of the renormalization procedure.