Abstract

A brief phenomenological review on the status of glueballs and hybrids is presented. Recent results for scalar mesons in hadronic reactions and in ∞∞-collisions suggest that f0(1500) has a large glue content and forms the dominant component of the ground state scalar glueball, while f0(1710) is mainly ss. The flrst excited glueball state, a tensor, has not been identifled yet, although more tensor states have been reported than can be accommodated in the qq nonets. We have now evidence for two isovector mesons, …1(1400) and…1(1600), with quantum numbers incompatible with qq states, which could be hybrid mesons or four-quark states.

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