Evidence for a Bound H-dibaryon from Lattice QCD

TL;DR

This study provides lattice QCD evidence for a bound H-dibaryon state with specific quantum numbers, demonstrating its existence at a pion mass of approximately 389 MeV through multiple ensemble calculations.

Contribution

First lattice QCD evidence for a bound H-dibaryon at this pion mass, using multiple ensembles and anisotropic clover gauge configurations.

Findings

H-dibaryon bound by approximately 16.6 MeV

Evidence consistent across four lattice ensembles

Supports existence of H-dibaryon in QCD simulations

Abstract

We present evidence for the existence of a bound H-dibaryon, an I=0, J=0, s=-2 state with valence quark structure uuddss, at a pion mass of m_pi ~ 389 MeV. Using the results of Lattice QCD calculations performed on four ensembles of anisotropic clover gauge-field configurations, with spatial extents of L ~ 2.0, 2.5, 3.0 and 3.9 fm at a spatial lattice spacing of b ~ 0.123 fm, we find an H-dibaryon bound by B = 16.6 +- 2.1 +- 4.6 MeV at a pion mass of m_pi ~ 389 MeV.