Evidence against a Stable Dibaryon from Lattice QCD

We have used standard numerical techniques of lattice quantum chromodynamics to look for evidence of the proposed doubly strange spin-zero dibaryon (the $H$ particle), and to determine the splitting between the mass of the $H$ and the mass of two $\Lambda \text{'}\mathrm{s}$, its lightest possible strong-decay channel. We find that the dibaryon is above the two-$\Lambda$ threshold, making it unstable to strong decay.