In order to describe Kaon-Nucleon scattering data, the mixing of scalar meson σ0 and σ8 must be introduced in the chiral SU(3) quark model. Inspired by this, now the mixing of scalar meson is further considered to study some interesting dibaryons in the chiral SU(3) quark model. The results show that the mixing of scalar meson has different effects on these dibaryons.
We study the Σ*-Δ interaction in the chiral SU(3) quark model and in the extended chiral SU(3) quark model. In these two models,the short-range interaction mechanism are totally different,one is from the one-gluon exchange and another is from the vector meson exchange. The possible reasons of forming strangeness -1 bound states are given. Comparisons between the cases with and without quark exchange effect are made. The results show the quark exchange effect does give attractions to (Σ*Δ)ST=0 52 and (Σ*Δ)ST=3 12 systems,which means the special symmetry is important. Also,we make some analysis on chiral field effect,our results show that the σ exchange dominantly provides the attractive interaction for these two states.
DAI Lian-rong1,BAI Li-hui1,ZHANG He1, LIU Jia1,FU Yao1,2,TONG De-xin1,3 (1 Department of Physics,Liaoning Normal University,Dalian 116029,Liaoning,China
