The Glueball; The Fundamental Particle of Non-Perturbative QCD

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.

Comments: 14 pages. Talk given at the Montpelier Conference and Paris Workshop on QCD