Meson resonances and glueballs: Theoretical review and relevance to p-p at LEAR

This chapter reviews some theoretical ideas about the meson spectrum and briefly discusses what may be learned about it in p-p annihilation. Conventional q-q mesons as treated in potential models are examined by focusing on the familiar c-c system. The possibility of detecting constituent gluons in p-p annihilation, in gg states (which may already have been detected in e+e- and p-p) and in the exotic J /SUP PC/ ''hermaphrodite'' states q-qg, is investigated. The Low-Energy Antiproton Ring (LEAR) energies could be increased so that c-c production occurs, although there are no plans to study charmonium at LEAR. The c-c models are compared with scalar and vector long-range potentials in order to see which levels best distinguish them. Some theoretical ideas about the gg glueball spectrum, arising from lattices, QCD sum rules, bag models, and potential models, are considered