Negative-parity baryons in quenched anisotropic lattice QCD Original Research Article

We study negative-parity baryon spectra in quenched anisotropic lattice QCD. The negative-parity baryons are measured as the parity partner of the ground-state baryons. In addition to the flavor octet and decuplet baryons, we pay much attention to the flavor-singlet negative-parity baryon as a three-quark state and compare it with the Λ (1405) baryon. For the flavor octet and decuplet negative-parity baryons, the calculated masses are close to experimental values of corresponding lowest-lying negative-parity baryons. On the other hand, the flavor-singlet baryon is found to be much heavier than Λ(1405), which indicates the multi-quark state of Λ(1405) such as the View the MathML source molecule rather than the flavor-singlet three-quark state.