Bound H-dibaryon in Flavor SU(3) Limit of Lattice QCD

TL;DR

This study uses lattice QCD to investigate the flavor-singlet H-dibaryon, revealing a volume-insensitive potential that predicts a bound state with a binding energy of 30-40 MeV at certain meson masses.

Contribution

It introduces a novel lattice QCD approach to derive the baryon-baryon potential and demonstrates the existence of a bound H-dibaryon in the flavor SU(3) limit.

Findings

Bound H-dibaryon with 30-40 MeV binding energy.

Potential is insensitive to lattice volume.

Supports existence of H-dibaryon in flavor SU(3) limit.

Abstract

The flavor-singlet H-dibaryon, which has strangeness -2 and baryon number 2, is studied by the approach recently developed for the baryon-baryon interactions in lattice QCD. The flavor-singlet central potential is derived from the spatial and imaginary-time dependence of the Nambu-Bethe-Salpeter wave function measured in N_f=3 full QCD simulations with the lattice size of L = 2, 3, 4 fm. The potential is found to be insensitive to the volume, and it leads to a bound H-dibaryon with the binding energy of 30 - 40 MeV for the pseudo-scalar meson mass of 673 - 1015 MeV.