Most charming dibaryon near unitarity

TL;DR

This study investigates a pair of triply charmed baryons using lattice QCD, revealing they are in the unitary regime with strong interactions, which could imply the existence of a novel dibaryon state.

Contribution

First lattice QCD study of $ ext{Ω}_{ccc} ext{Ω}_{ccc}$ dibaryon near unitarity, providing insights into its scattering properties and interaction regime.

Findings

Scattering length approximately -19 fm indicating strong attraction.

Effective range around 0.45 fm consistent with unitarity.

System likely in the unitary regime with potential for bound states.

Abstract

We present a first study on a pair of triply charmed baryons, $\Omega_{ccc}\Omega_{ccc}$ in the $^1S_0$ 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 $a^\mathrm{C}_0\simeq-19$ fm and the effective range $r^\mathrm{C}_\mathrm{eff}\simeq0.45$ fm, which indicates $\Omega_{ccc}\Omega_{ccc}$ is located in the unitary regime.