The Glueball; The Fundamental Particle of Non-Perturbative QCD

TL;DR

This paper reviews theoretical concepts supporting the existence of glueballs in QCD, emphasizing non-perturbative phenomena and their implications for particle physics.

Contribution

It provides a comprehensive overview of non-perturbative QCD phenomena and their relation to glueball properties and the nucleon mass.

Findings

Glueballs are linked to confinement and vacuum condensates.

The trace of the stress-tensor is dominated by glueballs.

A theorem on the lightest glueball state is discussed.

Abstract

Theoretical ideas related to the existence of glueballs in QCD are reviewed. These include non-perturbative phenomena such as confinement, instantons, vacuum condensates and renormalons. We also discuss glueball dominance of the trace of the stress-tensor, the mass content of the nucleon and a theorem on the lightest glueball state.