Present Constraints on the H-dibaryon at the Physical Point from Lattice QCD

TL;DR

This paper reviews current lattice QCD constraints on the H-dibaryon, highlighting uncertainties in extrapolations to the physical point and emphasizing the need for further calculations to determine its existence.

Contribution

It analyzes existing lattice QCD data and explores simple chiral extrapolations, providing insights into the possible bound state or scattering nature of the H-dibaryon.

Findings

Extrapolations allow for a bound H-dibaryon or near-threshold state.

Current lattice data are limited and inconclusive.

Further lattice QCD studies are necessary.

Abstract

The current constraints from lattice QCD on the existence of the H-dibaryon are discussed. With only two significant lattice QCD calculations of the H-dibaryon binding energy at approximately the same lattice spacing, the forms of the chiral and continuum extrapolations to the physical point are not determined. In this brief report, we consider the constraints on the H-dibaryon imposed by two simple chiral extrapolations. In both instances, the extrapolation to the physical pion mass allows for a bound H-dibaryon or a near-threshold scattering state. Further lattice QCD calculations are required to clarify this situation.