Ab-initio study of dibaryons with highest bottom number

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 ${}^1{S}_0$ 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(${}_{-16}^{+14}$) 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.

Comments: 7 pages, 4 figures, 2 tables, contribution for the 39th International Symposium on Lattice Field Theory, 8th-13th August, 2022, Bonn, Germany