# Super-heavy Quarkonia as a probe of the QCD Vacuum

## TL;DR

This paper explores how a non-perturbative gluon condensate influences super-heavy quarkonium spectra using NRQCD, combining lattice simulations and perturbative comparisons to understand QCD vacuum effects.

## Contribution

It introduces lattice NRQCD simulations with an improved gluon action to study non-perturbative effects on heavy quarkonium spectra, providing a novel approach to probing the QCD vacuum.

## Key findings

- Non-perturbative gluon condensate significantly affects quarkonium energy levels.
- Lattice results are consistent with perturbative calculations within uncertainties.
- The study offers insights into the QCD vacuum structure through heavy quark bound states.

## Abstract

We investigate the effect of a non-perturbative gluon condensate on the spectrum of bound states of extremely heavy quarks using Non-Relativistic-QCD (NRQCD). Simulations are done with an improved gluon action on small lattices. We compare our numerical results with perturbative calculations to test the consistency.