Five-Quark Picture of Λ(1405) in Anisotropic Lattice QCD
Abstract
Five-quark (5Q) picture of Λ(1405) is studiedusing quenched lattice QCD with an exotic 5Q operator of Nbar{K} type. To discreminate mere Nbar{K} and Σπ scattering states, Hybrid Boundary Condition (HBC), a flavor-dependent boundary condition, is imposed on the quark fields along spatial direction. 5Q mass m_{5Q}≃ 1.89 GeV is obtained after the chiral extrapolation to the physical quark mass region, which is too heavy to be identified with Λ(1405). Then, Λ(1405) seems neither a pure 3Q state nor a pure 5Q state, and therefore we present an interesting possibility that Λ(1405) is a mixed state of 3Q and 5Q states.
- Publication:
-
Progress of Theoretical Physics Supplement
- Pub Date:
- 2007
- DOI:
- 10.1143/PTPS.168.598
- arXiv:
- arXiv:0707.0079
- Bibcode:
- 2007PThPS.168..598I
- Keywords:
-
- High Energy Physics - Lattice
- E-Print:
- A talk given at Yukawa International Seminar(YKIS) 2006 NEW FRONTIERS IN QCD --Exotic Hadrons and Hadronic Matter--, Kyoto, Japan, Nov. 20-Dec.8 2006, 4 pages, 2 figures