Baryon resonances as hadronic molecule states with kaons

Abstract

We investigate hadronic molecule states of $K \bar K N$ and $\bar K \bar K N$ systems with I = 1/2 and J ^P = 1/2⁺, assuming that Λ(1405) and the scalar mesons, f ₀(980), a ₀(980), are reproduced as quasi-bound states of $\bar KN$ and $K \bar K$. Performing non-relativistic three-body calculations for these systems, we find weakly bound states for $K \bar K N$ and $\bar K \bar K N$ around 1900 MeV, which correspond to new baryon resonances of N ^* and Ξ ^* with J ^P = 1/2⁺. We find that these resonances have cluster structure of the two-body bound state keeping its properties as in the isolated two-particle system.