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 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 S-1(0) channel, taking into account the Coulomb repulsion with the charge form factor of Omega(ccc), leads to the scattering length a(0)(C) similar or equal to -19 fm and the effective range r(eff)(C) similar or equal to -0.45 fm. The ratio r(eff)(C)/a(0)(C) similar or equal to -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.

Automated summary

A pair of triply charmed baryons, Omega(ccc)Omega(ccc), is studied as an ideal dibaryon system, revealing that they are located in the unitary regime with short scattering length and small effective range.