CCAST, World Lab, Beijing 100080, Peoples R China
; Huazhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China
; Inst High Energy Phys, Beijing 100049, Peoples R China
A preliminary investigation of (K) over barN interaction is performed within a chiral constituent quark model by solving the resonating group method (RGM) equation. The model parameters are taken from our previous work, which gave a satisfactory description of the S-, P-, D-, F-wave KN scattering phase shifts. The channel-coupling between (K) over barN,pi Lambda and pi Sigma is considered, and the scattering phase shifts as well as the bound-state problem of (K) over barN are dynamically studied. The results show that the S-wave (K) over barN interaction in the isospin I=0 channel is attractive, and in the extended chiral SU(3) quark model such an attraction can make for a (K) over barN bound state, which appears as a pi Sigma resonance in the coupled-channel calculation, while the chiral SU(3) quark model cannot accommodate the existence of a (K) over barN bound state. It seems that the vector meson exchanges are necessary to be introduced in the quark-quark interactions if one tries to explain the Lambda(1405) as a (K) over barN bound state or a pi Sigma-(K) over barN resonance state.