The most fascinating dibaryon in the non-strange quark sector is $$d^*(2380)$$
d
∗
(
2380
)
, which was reported by WASA-at-COSY Collaboration and confirmed by A2@MAMI Collaboration. The reported mass and decay width are $$M\approx 2.37$$
M
≈
2.37
GeV, $$\Gamma \approx 70$$
Γ
≈
70
MeV and the quantum numbers are $$IJ^P=03^+$$
I
J
P
=
03
+
. The structure of $$d^*(2380)$$
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 $$d^*(2380)$$
d
∗
(
2380
)
in the framework of constituent quark models without assuming the presupposed structure. The results show that the radius of $$d^*(2380)$$
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 $$\Delta $$
Δ
s dominate the state is possible.
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