Gluonia, Scalar and Hybrid Mesons in QCD

Abstract

For some experimental guidelines of the next millenium, I review the determinations of the masses, decays and mixings of the gluonia, scalar and hybrid mesons from QCD spectral sum rules and low-energy theorems, and compare them with the lattice.

Comments: Latex2e sources 10 pages. Plenary talk given at Hadrons 99 (Beijing)