| Content: The chiral SU(3) quark model has achieved success in explaining the ground statestructure and natrue of baryon, the experimental data in such respects as the nucleon-the nucleonand the nucleon-the hyperon scattering, etc.. The extended chiral SU(3) quark model can beconstructed by introducing the coupling of quark and vector field on the foundation of chiralSU(3) quark model. The short distance mutual function mechanisms of the two kinds of modelsare totally different. In the chiral SU(3) quark model, the short distance mutual function isoffered by the one gluon exchanges(OGE), while in the extended, chiral SU(3) quark model, theshort distance mutual function is offered by the vector mesons changes.In the extended chiral SU(3) quark model, this text studys∑*△(3,1/2), the possible dibaryoncandidates of strange number for-1, within the framework of resonating group method(RGM)and using the sets of paramaters which have been successfully employed in the research of N-Nscattering phase shifts and deuteron bound state. The results show that the qualitative resultsgained from the two models are unanimous. The prediction binding energy of∑*△(3,1/2) in thistwo models is both above the threshold of∧π△and below the threshold of∑*△. Compared tochiral SU(3) quark model, the binding energies of∑*△(3,1/2) will be enhanced in the extendedchiral SU(3) quark model, because the vector meson exchange offers more attractive force tothem. This is very different with the prediction of deeply bound dibaryon state below thethreshold of∧Nππin other model. Then, we further investigate the structure of∑*△(3,1/2)dibaryon using the set of parameters by fitting K-N scattering process where the mixed angleof scalar mesons is considered. |
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