Structure of ${\lambda }^{\ast }$(1405) and the ${\lambda }^{\ast }$-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 $g_{{\Lambda }^{\ast }\pi \Sigma }^2$ and $g_{{\Lambda }^{\ast }\bar{K}N}^2$. Our findings corroborate with about 50% of five-quark admixture in the $\Lambda (1405)$ needed in reproducing the strong decay width, ${\Gamma }_{\Lambda (1405)\to (\Sigma \pi {)}^{\circ }}$.

Comments: Contributed to MESON2010