Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2002-04-11
Proceeding of International Symposium on ``Hadrons and Nuclei'' (AIP Conference Proceedings CP594,349-356,2001)
Physics
High Energy Physics
High Energy Physics - Lattice
8 pages, 3 figures, proceeding of "International Symposium on Hadron and Nuclei" at Yonsei Univ., Seoul, Korea 20-22 Feb. 2001
Scientific paper
The spectra of octet and decuplet baryons are studied using SU(3) lattice QCD at the quenched level. As an implementation to reduce the statistical fluctuation, we employ the anisotropic lattice with $O(a)$ improved quark action. In relation to $\Lambda(1405)$, we measure also the mass of the SU(3) flavor-singlet negative-parity baryon, which is described as a three quark state in the quenched lattice QCD, and its lowest mass is measured about 1.6 GeV. Since the experimentally observed negative-parity baryon $\Lambda(1405)$ is much lighter than 1.6 GeV, $\Lambda(1405)$ may include a large component of a $N \bar K$ bound state rather than the three quark state. The mass splitting between the octet and the decuplet baryons are also discussed in terms of the current quark mass.
Matsufuru Hideo
Nakajima Noriaki
Nemoto Yukio
Suganuma Hideo
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