Abstract
We propose that the mass of the $\eta^\prime$ meson is a particularly sensitive probe of the properties of finite energy density hadronic matter and quark gluon plasma. We argue that the mass of the $\eta^\prime$ excitation in hot and dense matter should be small, and therefore that the $\eta^\prime$ production cross section should be much increased relative to that for pp collisions. This may have observable consequences in dilepton and diphoton experiments.
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