Abstract
The most fascinating dibaryon in the non-strange quark sector is d^*(2380), which was reported by WASA-at-COSY Collaboration and confirmed by A2@MAMI Collaboration. The reported mass and decay width are Mapprox 2.37 GeV, Gamma approx 70 MeV and the quantum numbers are IJ^P=03^+. The structure of d^*(2380) is still in controversy. In the present calculation, the powerful method in few-body system, Gaussian expansion method (GEM) is employed to explore the structure of d^*(2380) in the framework of constituent quark models without assuming the presupposed structure. The results show that the radius of d^*(2380) is around 0.8 fm, it is a very compact object. Because of the compact structure, the color singlet-singlet component has a large overlap with the color octet-octet one, two colorless, large overlapped Delta s dominate the state is possible.
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