The H dibaryon on the lattice

TL;DR

This study uses lattice QCD simulations to investigate the mass of the H dibaryon, finding it likely unbound or marginally bound, thus challenging its existence as a stable state.

Contribution

First lattice QCD calculation of the H dibaryon mass using improved actions and techniques to assess its bound state nature.

Findings

H mass is above or near the mbdambda threshold

Bound H dibaryon state appears unlikely based on results

Simulation methods effectively enhance ground state overlap

Abstract

We present our final results for the mass of the six quark flavor singlet state (J^P=0^+, S=-2) called H dibaryon, which would be the lightest possible strangelet in the context of strange quark matter. The calculations are performed in quenched QCD on (8-24)^3 x 30 lattices with the (1,2) Symanzik improved gauge action and the clover fermion action. Furthermore the fuzzing technique for the fermion fields and smearing of the gauge fields is applied in order to enhance the overlap with the ground state. Depending on the lattice size we observe an H mass slightly above or comparable with the \Lambda\Lambda threshold for strong decay. Therefore a bound H dibaryon state seemed to be ruled out by our simulation.