Construction of KbarN potential and structure of Lambda(1405) based on chiral unitary approach

TL;DR

This paper develops a realistic KbarN local potential based on the chiral unitary approach, incorporating recent experimental data, to study the structure of Lambda(1405) and its meson-baryon molecular nature.

Contribution

It introduces a new local potential for KbarN that accurately reproduces scattering amplitudes and resonance structures, constrained by recent experimental data.

Findings

The potential reproduces scattering amplitudes accurately.

Lambda(1405) is shown to have a meson-baryon molecular structure.

Uncertainty in KbarN amplitude is significantly reduced.

Abstract

Based on chiral unitary approach, we construct the realistic KbarN local potential, which is useful for the quantitative calculation of Kbar-nuclei. Since the resonance pole structure of the KbarN system seems important for the Kbar-nuclei and the spacial structure of Lambda(1405), we establish the construction procedure of the local potential paying attention to the scattering amplitude in the complex energy plane. Furthermore, for the quantitative study of the Kbar-nuclei, we consider the constraint from the recent experimental data measured by SIDDHARTA, which significantly reduces the uncertainty of the KbarN amplitude. With this new local potential, we estimate the spacial structure of Lambda(1405) and obtain the result indicating the meson-baryon molecular state of Lambda(1405).