A possible interpretation of $\Lambda$ baryon spectrum with pentaquark components
- Mr. Kai XU
- Mr. Kai XU (Suranaree University of Technology)
The $\Lambda$ baryon spectrum is studied with the SU(3) flavor symmetry in the CQM. We found it difficult to accommodate some negative-parity resonances as single $q^2s$ states in the normal three-quark picture. A possible interpretation is proposed: The $\Lambda(1520)$ and $\Lambda(1690)$ are mixtures of two $q^2s$ negative-parity states, and the $\Lambda(1405)$, $\Lambda(1670)$ and $\Lambda(2000)$ are three-state mixtures of two $q^2s$ states and one ground $q^3s\bar q$ pentaquark state.