The nature of the Lambda(1405)

TL;DR

This paper investigates the Lambda(1405) resonance, supporting its interpretation as a dynamically generated state from meson-baryon interactions, and compares theoretical predictions with recent experimental data across various reactions.

Contribution

It provides evidence for the two-pole structure of Lambda(1405) and analyzes different reactions to understand its nature and decay modes.

Findings

Support for two-pole structure of Lambda(1405)

Different reaction shapes confirm its complex nature

Theoretical predictions align with recent experimental results

Abstract

We present here some results supporting the nature of the $\Lambda(1405)$ resonance as dynamically generated from the meson baryon interaction in coupled channels and resulting from the superposition of two close-by poles. We find support for this picture in the $K^- p \to \pi^0 \pi^0 \Sigma^0 $ reaction, which shows a different shape than the one obtained from the $\pi ^- p \to K^0 \pi \Sigma $ reaction. We also call the attention to the $K^- p \to \gamma \pi \Sigma$ with $\pi \Sigma$ in the $\Lambda(1405)$ region, which shows a narrow peak in the calculations around 1420 MeV. We also report on recent calculations of the radiative decay of the two $\Lambda(1405)$ states and on reactions to obtain information on these decay modes. Finally, we present results for the $pp\to p K^+\Lambda(1405)$ reaction recently measured at ANKE/COSY and compare them with theoretical results.