We perform a systemical investigation of the low-lying doubly heavy dibaryon systems with strange $S=0$, isospin $I=0$, 1, 2, and the angular momentum $J=0$, 1, 2, 3 in the quark delocalization color screening model. We find the effect of channel-coupling cannot be neglected in the study of the multi-quark systems. Several bound systems are obtained. They are the doubly charm dibaryon systems with $IJ=00$, $IJ=01$, and $IJ=02$, and the corresponding energies are 4590, 4720, and 4764 MeV, respectively; and the doubly bottom dibaryon systems with $IJ=00$, $IJ=02$, and $IJ=13$, and the corresponding energies are $11219$, $11416$, and $11633$ MeV, respectively. Besides, six resonance states are obtained, which are $IJ=00N{\mathrm{\Xi }}_{cc}$ and $N{\mathrm{\Xi }}_{bb}$ with resonance masses of 4730 and 11411 MeV respectively, $IJ=11N{\mathrm{\Xi }}_{cc}^{*}$ and $N{\mathrm{\Xi }}_{bb}^{*}$ with resonance masses of 4775 and 11432 MeV respectively, and $IJ=12{\mathrm{\Sigma }}_c{\mathrm{\Sigma }}_c^{*}$ and ${\mathrm{\Sigma }}_b{\mathrm{\Sigma }}_b^{*}$ with resonance masses of 4935 and 11626 MeV respectively. All these heavy dibaryons are worth searching for in experiments, although it will be a challenging work.

• Received 4 June 2021
• Revised 27 December 2021
• Accepted 25 January 2022

DOI:https://doi.org/10.1103/PhysRevC.105.025201

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Published by the American Physical Society