Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2003-02-20
Phys.Rev. D68 (2003) 094505
Physics
High Energy Physics
High Energy Physics - Lattice
14 pages, 15 eps figures, version to appear in Phys. Rev. D. Discussions on the quenching effects are mainly modified
Scientific paper
10.1103/PhysRevD.68.094505
We investigate the negative-parity baryon spectra 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, respectively. The negative-parity baryons are measured with the parity projection. In particular, we pay much attention to the lowest SU(3) flavor-singlet negative-parity baryon, which is assigned as the Lambda(1405) in the quark model. 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 found to be about 1.7 GeV, which is much heavier than the Lambda(1405). Therefore, it is difficult to identify the Lambda(1405) to be the flavor-singlet three-quark state, which seems to support an interesting picture of the penta-quark (uds qbar q) state or the N-Kbar molecule for the Lambda(1405).
Matsufuru Hideo
Nakajima Noriaki
Nemoto Yukio
Suganuma Hideo
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