Abstract
I will review some of the outstanding issues in meson spectroscopy. The most important qualitative issue is, whether hadrons with explicit gluonic degrees of freedom exist. To answer this question requires a much better understanding of conventional q \(\overline{q}\) mesons. I therefore begin by examining the status of conventional meson spectroscopy and how the situation can be improved. I then survey the expected properties of hybrids to give guidance to experimental searches. I briefly mention glueballs, since they axe likely to be more difficult to find. The final section discusses multiquark systems, as they are likely to be important in the mass region under study and will have to be understood better.
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Godfrey, S. (1990). Mesons, hybrids, and glueballs: the search for new forms of hadronic matter. In: Frekers, D., Gill, D.R., Speth, J. (eds) Physics at KAON. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-75467-8_15
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