Dibaryon with Highest Charm Number near Unitarity from Lattice QCD

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 charm mass. The spatial baryon-baryon correlation related to their scattering parameters on basis HAL method. $\Omega_{ccc}\Omega_{ccc}$ in ${^1S_0}$ channel taking into account Coulomb repulsion charge form factor $\Omega_{ccc}$ leads length $a^{\rm C}_0\simeq -19~\text{fm}$ effective range $r^{\rm C}_{\mathrm{eff}}\simeq 0.45~\text{fm}$. ratio C}_{\mathrm{eff}}/a^{\rm C}_0 \simeq -0.024$, whose magnitude considerably smaller than that dineutron ($-0.149$), indicates located unitary regime.