Evidence for a scalar glueball

We show that the newly discovered scalar meson f0(1500) at LEAR has properties compatible with the lightest scalar glueball predicted by lattice QCD and incompatible with a QQ state. We suggest that decays of glueballs are into pairs of glueballs (including η, η′ or (ππ)s) or by mixing with nearby QQ states. The partial widths of f0(1500) are in accord with this hypothesis, tests of which include characteristic radiative decays to γφ, γω, γϱ and the prediction of a further scalar state, f′0(1500 – 1800) which couples strongly to KK, ηη and ηη′.