Structure of $\lambda^*$(1405) and the $\lambda^*$-Meson-Baryon Coupling Constants

TL;DR

This paper investigates the internal quark structure of the Lambda(1405) resonance using an extended chiral constituent quark model, emphasizing the role of five-quark components in its decay properties.

Contribution

It introduces a detailed analysis of three- and five-quark configurations in Lambda(1405), highlighting the significance of five-quark admixture in decay width reproduction.

Findings

Approximately 50% five-quark admixture in Lambda(1405)

Reproduction of decay width consistent with experimental data

Insights into meson-baryon coupling constants

Abstract

Within an extended chiral constituent quark model, three- and five-quark structure of the $S_{01}$ resonance $\Lambda(1405)$ is investigated with respect to the coupling constants $g^2_{\Lambda^* \pi \Sigma}$ and $g^2_{\Lambda^* \bar{K} N}$. Our findings corroborate with about 50% of five-quark admixture in the $\Lambda(1405)$ needed in reproducing the strong decay width, $\Gamma_{\Lambda(1405)\to (\Sigma \pi)^\circ}$.