Mixtures of quarkonium and gluonium.

Abstract

In this talk we investigate the possibility that states that have a mixed quarkonium‐gluonium content exist and would be their spectroscopy. The beginning of this analysis was inspired by questions raised about the nature of ι(1440). The analysis will include mass spectroscopy, radiative decays and production data for such states from J/ψ and ψ’(3685) as well as prospects for the future.