New results from LEAR experiments on the search for glueballs and other non- states have attracted considerable attention, particularly the discovery of the (1500), which is an excellent candidate for the scalar glueball. This article gives an overview about the special features of annihilation for meson spectroscopy, and about the use of initial and final-state selection for quantum-number filtering. The general model underlying the partial-wave analysis is discussed. An overview about the Crystal Barrel, OBELIX, and Jetset experiments and their results is followed by a comparison of results from other production mechanisms. Finally, an interpretation of the new results is given.


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  • Article Type: Review Article
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