Internal structure of the Lambda(1405) resonance probed in chiral unitary amplitude

TL;DR

This study investigates the internal structure of the Lambda(1405) resonance using chiral unitary amplitudes, revealing it is mainly composed of a Kbar around N with a significant pi Sigma component.

Contribution

It provides a detailed analysis of Lambda(1405)'s internal structure through meson-baryon dynamics and form factors, offering new insights into its composition.

Findings

Lambda(1405) is mainly Kbar-N bound state

Significant pi Sigma component in Lambda(1405)

Form factors support meson-baryon molecular structure

Abstract

The internal structure of the resonant Lambda(1405) state is investigated based on meson-baryon coupled-channels chiral dynamics. We evaluate Lambda(1405) form factors which are extracted from current-coupled scattering amplitudes in meson-baryon degrees of freedom. Using several probe currents and channel decomposition, we find that the resonant Lambda(1405) state is dominantly composed of widely spread Kbar around N, with escaping pi Sigma component.