A chiral quark model analysis of the $\bar KN$ interaction

TL;DR

This paper uses a constituent quark model to analyze the antikaon-nucleon interaction, successfully reproducing experimental cross sections and exploring the existence of bound states related to the Lambda(1405).

Contribution

It introduces a quark model approach to study the $ar KN$ interaction, providing insights into bound states and resonance structures.

Findings

Good agreement with experimental cross sections

Identification of two poles related to $ar KN$ bound states

Interpretation of poles as the $ ext{Lambda}(1405)$ state

Abstract

In this work we analyze the $\bar KN$ interaction in the framework of a constituent quark model. The near-threshold elastic and charge exchange cross sections are evaluated, finding a good agreement with the experimental data. Furthermore, the possible existence of $\bar KN$ bound states are explored, finding two poles in the isoscalar $J^P=\frac{1}{2}^-$ sector that can be interpreted as the experimental $\Lambda(1405)$ state.