Properties of scalar gluonium

Abstract

We examine the properties of a scalar glueball in a simple effective-Lagrangian model which satisfies both the axial-vector and trace anomaly equations of quantum chromodynamics. The scalar-glueball decay pattern can be predicted if its mass is specified and may present some unusual features. In this approach a characteristic mass scale is directly related to the vacuum energy density which automatically comes out to be of a nonperturbative type.