Review of the ${\mathbf \Lambda}$(1405): A curious case of a strange-ness resonance

TL;DR

This review summarizes the historical, experimental, and theoretical developments of the $ ext{Lambda}(1405)$ resonance, highlighting its significance in understanding SU(3) hadron dynamics and recent debates on its pole structure.

Contribution

It provides a comprehensive overview of the $ ext{Lambda}(1405)$, including a unified database of experimental results and a comparison of recent theoretical models.

Findings

Historical prediction and experimental verification of $ ext{Lambda}(1405)$

Debate on the existence of a second broad pole

Comparison of recent theoretical approaches

Abstract

During its long-lasting history, the $\Lambda(1405)$ has become a benchmark for our understanding of the $\rm SU(3)$ hadron dynamics. Starting with its theoretical prediction and later experimental verification, until the most recent debates on the existence of the second broad pole, it emerged as a fruitful research area sparking many theoretical and experimental developments. This review intends to provide the reader with the current status of research on the $\Lambda(1405)$-resonance, reflecting on historical, experimental and theoretical developments. A common database for experimental results and a comparison of most recent theoretical approaches will be provided in the last two parts of this manuscript.