From Coloured Quarks to Quarkonia, Glueballs and Hybrids

摘要

The author will first show the important role that color plays for quarks inbaryons and then he will contrast baryons, made of three constituent quarks, with the nuclei 3H and 3He which are made of three nucleons. Then he will concentrate on colour in mesons, extracting information about the color forces from spectroscopy (section 3). He will then discuss decays (section 4) in order to contrast with glueball decays (section5) before considering a 'realistic' picture where glueball and quarkonia mix (section 6). The production of glueballs is discussed in section 7, the phenomenology of hybrids in section 8 and some attempts to test the hybrid interpretation are in the final section.