The Study Of Multi-quark State

Content:The structures of multi-quark system are investigated in the chiral SU(3) quark model and in the extended chiral SU(3) quark model by solving the resonating group method equation(RGM).The short-range mechanisms are different in these models,one is from onegluon exchange effect in the chiral SU(3) quark model,the other is from vector meson change effect in the extended chiral SU(3) quark model.Firstly,the structure of NΩwith spin S=1 and S=2 are studied.The results show that N(?) with spin S=1 and S=2 systems can be bound states.The scattering proccess are also studied.Secondly,the structures of NΩand N(?) systems are compared.We calculate the binding energies of these two systems and find the binding energies of these two systems are different.We further make an analysis of the interaction GCM matrix element and find that the strangeκ,K和K^* meson exchange contribute repulsive force to NΩsystems and contribute nothing to N(?) system.Therefore,the binding energies in N(?) system are larger than those in NΩsystem.Finally,the annihilation effect,the width of wave function,the mass ofσand the factor of f_chv/g_chv are further investigated.When the annihilation effect is considered,the N(?) system will become more bound.When we change the width of wave function,the mass ofσand the factor of f_chv/g_chv within a reasonable range,NΩsystem would become bound state.