| In the past years, the chiral SU(3) quark model has achieved success. In this model, the nonet pseudo-scalar meson exchanges and the nonet scalar meson exchanges are considered in describing the medium-and long-range parts of the interactions, and the one gluon exchange(OGE) describe the short-range repulsion. By using this model, the spectrum of ground state baryons and the processes of nucleon-nucleon(N-N) and nucleon-hyperon(N-Y) scattering can be explained reasonably with the same set of parameters. The possible dibaryon bound state candidates are also predicted in this chiral SU(3) quark model.In order to study the different short-range interaction, the extended chiral SU(3) quark model has been proposed. Based on chiral SU(3) quark model, couplings among vector meson fields with quarks is considered in this extended chiral SU(3) quark model. There are totally different short-range mechanisms in this two models. The OGE is responsible for the short-range mechanism in the chiral SU(3) quark model, and vector meson change effect governs short-range mechanism in the extended chiral SU(3) quark model.In the extended chiral SU(3) quark model, the possible dibaryon candidates are predicted within the framework of resonating group method(RGM). We use the same sets of parameters which have been successfully employed in the research of N-N scattering phase shifts and deuteron bound state, to study non-strangeness △△3,0 (S = 3,T = 0) and △△3,0(S = 0,T = 3) dibaryons. We get the same results qualitatively in this two models. Further, we investigate the controversial dibaryon bound state candidate, NΩ2,1/2(S = 2,T = 1/2). Our results show, compared to chiral SU(3) quark model, the binding energy of NΩ will be enhanced in the extended chiral SU(3) quark model. However, the prediction of NΩ(2,1/2) is a weak bound dibaryon state above the threshold of N(?)K in our model, which is different with the prediction of deeply bound dibaryon state below the threshold of NAK in other model. |
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