Abstract
Previously, we extended our chiral SU(3) quark modelto include the coupling between the quark and vector chiral fields [Nucl. Phys. A727 (2003) 321]. Here we further study the structure of (ΩΩ)ST = 00dibaryon in the extended chiral SU(3) quark model by solving a resonating groupmethod equation. The vector meson exchanges effect, hidden colour channel andcolour screening effect are investigated, respectively. The results show that the(ΩΩ)ST = 00 system is still the deeply bound state in the extendedchiral SU(3) quark model in which the vector meson exchanges control theshort-range quark–quark interaction, which is similar to the results obtained fromthe chiral SU(3) quark model. When the model space is enlarged by including thehidden colour channel, it is found that the energy of the hidden colour state|CC⟩str = −6,ST = 00 is much higher than that of the (ΩΩ)ST = 00state, thus the CC channel has little effect on the binding energy of(ΩΩ)ST = 00 state. When the error function confinement potential is considered, the bound state property would not change largely. Further, scalar meson mixing isconsidered. No matter whether θS = −18° or ideal mixing istaken, (ΩΩ)ST = 00 state is still a bound state.
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