Ab-initio study of dibaryons with highest bottom number

TL;DR

This study uses lattice QCD to investigate the existence of a deeply bound dibaryon composed of two $ ext{Ω}_{bbb}$ baryons, providing the first such evidence with a calculated binding energy.

Contribution

It presents the first lattice QCD evidence for a deeply bound $ ext{Ω}_{bbb}- ext{Ω}_{bbb}$ dibaryon with quantified uncertainties.

Findings

Evidence for a deeply bound dibaryon with a binding energy of -81 MeV.

Identification of a sub-threshold pole indicating a bound state.

Quantification of systematic uncertainties in the lattice calculation.

Abstract

We present the first lattice study of dibaryons with highest bottom number. Utilizing a set of state-of-the-art lattice QCD ensembles and methodologies, we determine the ground state of dibaryon composed of two $\Omega_{bbb}$ baryons. We extract the related scattering amplitude in the $^1S_0$ channel and find a sub-threshold pole, which signifies an unambiguous evidence for a deeply bound $\Omega_{bbb}-\Omega_{bbb}$ dibaryon. The binding energy of such a state as dictated by this pole singularity is found to be -81($^{+14}_{-16}$) MeV. We quantify various systematic uncertainties involved in this determination, including those related to the excited state contamination and Coulomb repulsion between the bottom quarks.