The $Λ$(1600): A Strange Hybrid Baryon

Abstract

We use the method of QCD sum rules to investigate a possible hybrid baryon with the quantum numbers of the $Λ$. Using a current composed of uds quarks in a color octet and a gluon, a strange hybrid, the $Λ_H$ is found about 500 MeV above the $Λ$, and we identify it as the $Λ(1600)$. Using our sigma/glueball model we predict a large branching fraction for the $Λ_H \to Λ+ σ(ππ$ resonance), and the experimental search for this decay mode could provide a test of the hybrid nature of the $/Lambda(1600)$.