Search for H dibaryon on the lattice

TL;DR

This study uses lattice QCD simulations to investigate the H-dibaryon, finding evidence that it is a bound state with a binding energy of approximately 47 MeV, supporting its existence as a stable hexa-quark state.

Contribution

First lattice QCD study to demonstrate the H-dibaryon as a bound state with high-accuracy simulations on coarse anisotropic lattices.

Findings

H-dibaryon is a bound state with ~47 MeV binding energy.

Negative energy difference indicates a bound hexa-quark state.

Attractive interaction observed in the continuum limit.

Abstract

We investigate the H-dibaryon, an $I(J^{P})=0(0^{+})$ with $s=-2$, in the chiral and continuum regimes on anisotropic lattices in quenched QCD. Simulations are performed on very coarse lattices with refined techniques to obtain results with high accuracy over a spatial lattice spacing in the range of $a_{s} \sim 0.19 - 0.41$ fm. We present results for the energy difference between the ground state energy of the hexa-quark stranglet and the free two-baryon state from our ensembles. A negative binding energy observed in the chirally extrapolated results leads to the conclusion that the measured hexa-quark state is bound. This is further confirmed by the attractive interaction in the continuum limit with the observed H-dibaryon bound by $\sim 47$ MeV.