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The structure of $\Delta\Delta$ dibaryon is studied in the extended chiralSU(3) quark model in which vector meson exchanges are included. The effect fromthe vector meson fields is very similar to that from the one-gluon exchange(OGE) interaction. Both in the chiral SU(3) quark model and in the extendedchiral SU(3) quark model, the resultant mass of the $\Delta\Delta$ dibaryon islower than the threshold of the $\Delta\Delta$ channel but higher than that ofthe $\Delta N\pi$ channel.Comment: 3 pages, to be published in Chin. Phys. Let

ΔΔ Dibaryon Structure in Extended Chiral SU (3) Quark Model