Most charming dibaryon near unitarity

Abstract

We present a first study on a pair of triply charmed baryons, ${\Omega }_{ccc}{\Omega }_{ccc}$ in the ${}^1{S}_0$ channel, on the basis of the HAL QCD method. The measurements are perfomed on the $(2+1)$-flavor lattice QCD configurations with nearly physical light-quark masses and physical charm-quark mass. We show that the system with the Coulomb repulsion taking into account the charge form factor of ${\Omega }_{ccc}$ leads to the scattering length $a_0^{\mathrm{C}}\simeq -19$ fm and the effective range $r_{\mathrm{eff}}^{\mathrm{C}}\simeq 0.45$ fm, which indicates ${\Omega }_{ccc}{\Omega }_{ccc}$ is located in the unitary regime.

Comments: 8 pages, 4 figures, Talk presented at the 38th International Symposium on Lattice Field Theory, LATTICE2021, July, 26th-30th 2021, Zoom/Gather@Massachusetts Institute of Technology