Determining the Gluonic Content of Isoscalar Mesons

Abstract

The gluonic widths of four leading glueball candidates are determined from their production in radiative quarkonium decays, allowing quantitative estimation of their glue content. Lattice predictions for the scalar and tensor channels seem to be in reasonable agareement with present data (allowing for mixing with $q \bar{q}$ states). However there is a glueball-like-state in the pseudoscalar spectrum whose mass is considerably lower than expected from lattice estimates.

Invited talk ICHEP96, Warsaw, Poland, July 29, 1996 based on work done in collaboration with M. B. Cakir, F. E. Close and Z. P. Li