Five-quark picture of Lambda(1405) in anisotropic lattice QCD

Details Five-quark picture of Lambda(1405) in anisotropic lattice QCD Five-quark picture of Lambda(1405) in anisotropic lattice QCD

2007-06-30

arxiv.org/abs/0707.0079v1

Prog.Theor.Phys.Suppl.168:598-601,2007

Physics

High Energy Physics

High Energy Physics - Lattice

A talk given at Yukawa International Seminar(YKIS) 2006 NEW FRONTIERS IN QCD --Exotic Hadrons and Hadronic Matter--, Kyoto, Ja

Scientific paper

10.1143/PTPS.168.598

Five-quark (5Q) picture of Lambda(1405) is studied using quenched lattice QCD with an exotic 5Q operator of N\bar{K} type. To discreminate mere N\bar{K} and \Sigma\pi scattering states, Hybrid Boundary Condition (HBC), a flavor-dependent boundary condition, is imposed on the quark fields along spatial direction. 5Q mass m_{5Q}\simeq 1.89 GeV is obtained after the chiral extrapolation to the physical quark mass region, which is too heavy to be identified with Lambda(1405). Then, Lambda(1405) seems neither a pure 3Q state nor a pure 5Q state, and therefore we present an interesting possibility that Lambda(1405) is a mixed state of 3Q and 5Q states.

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