Negative parity baryons in quenched anisotropic lattice QCD

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  • 20 February 2003
Abstract
We investigate the negative parity baryon spectrum in quenched lattice QCD. We employ the anisotropic lattice with standard Wilson gauge and O(a) improved Wilson quark actions at three values of lattice spacings with renormalized anisotropy xi=a_sigma/a_tau=4, where a_sigma and a_tau are spatial and temporal lattice spacings. The negative parity baryons are measured as the parity partner of the ground state baryons, i.e., by the same correlation functions as the positive parity baryons. In relation to Lambda(1405), we pay much attention to the SU(3) flavor singlet negative parity baryon, which is described as a three-quark state in quenched lattice QCD. For the flavor octet and decuplet negative parity baryons, the calculated masses are close to the experimental values of corresponding lowest-lying negative parity baryons. In contrast the flavor singlet baryon is much heavier than Lambda(1405), which indicates that the Lambda(1405) would be a multi-quark state such as the N-Kbar molecule rather than the flavor singlet three-quark state.

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