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Description
A pair of triply charmed baryons, $\Omega_{ccc}\Omega_{ccc}$, is studied as an ideal dibaryon system by (2+1)-flavor lattice QCD with nearly physical light-quark masses and the relativistic heavy quark action with the physical charm quark mass. The spatial baryon-baryon correlation is related to their scattering parameters on the basis of the HAL QCD method. The $\Omega_{ccc}\Omega_{ccc}$ in the $^1S_0$ channel taking into account the Coulomb repulsion with the charge form factor of $\Omega_{ccc}$ leads to the scattering length $a^{\mathrm C}_0\simeq-19$ fm and the effctive range $r^{\mathrm C}_{\mathrm{eff}}\simeq0.45$ fm. The ratio $r^{\mathrm C}_{\mathrm{eff}}/a^{\mathrm C}_0\simeq-0.024$, whose magnitude is considerably smaller than that of the dineutron ($-0.149$), indicates that $\Omega_{ccc}\Omega_{ccc}$ is located in the unitary regime.
