Search for a bound H-dibaryon using local six-quark interpolating operators

TL;DR

This study uses lattice QCD with improved Wilson fermions to search for a bound H-dibaryon, analyzing two-point functions with various operators and smearing techniques to identify potential bound states.

Contribution

It introduces a new noise reduction scheme and employs a comprehensive operator basis to improve the search for the H-dibaryon in lattice QCD.

Findings

Results from pion masses 451 MeV and 1 GeV.

Comparison with other lattice calculations.

Evidence for or against a bound H-dibaryon (pending detailed results).

Abstract

We present early results from a lattice QCD study seeking a bound $H$-dibaryon using $N_f=2$ flavors of $O(a)$ improved Wilson fermions and a quenched strange quark. We compute a matrix of two-point functions using operators consisting of the two independent local products of six positive-parity-projected quarks with the appropriate quantum numbers, which belong to the singlet and 27-plet irreducible representations of flavor SU(3). To expand this basis, we also independently vary the quark-field smearing, and apply a new scheme to reduce the noise caused by smearing. We then find the ground-state mass by solving the generalized eigenvalue problem. We show results from ensembles with pion masses 451 MeV and 1 GeV, and compare with other lattice calculations.