H-Dibaryon from Lattice QCD with Improved Anisotropic Actions

TL;DR

This study uses lattice QCD simulations with improved anisotropic actions to investigate the existence and properties of the H dibaryon, a six-quark state, finding its mass and suggesting a large radius with significant finite size effects.

Contribution

First lattice QCD calculation of the H dibaryon using improved anisotropic actions on different lattice sizes, providing insights into its mass and spatial extent.

Findings

H dibaryon mass around 2134-2167 MeV

Indications of a very large radius for the H dibaryon

Significant finite size effects observed

Abstract

The six quark state(uuddss) called H dibaryon($J^P=0^+$,$S=-2$) has been calculated to study its existence and stability. The simulations are performed in quenched QCD on $8^3 \times 24$ and $16^3 \times 48$ anisotropic lattices with Symanzik improved gauge action and Clover fermion action. The gauge coupling is $\beta=2.0$ and aspect ratio $\xi=a_s/a_t=3.0$. Preliminary results indicate that mass of H dibaryon is 2134(100)Mev on $8^3 \times 24$ lattice and 2167(59)Mev on $16^3 \times 48$ respectively. It seems that the radius of H dibaryon is very large and the finite size effect is very obvious.