Abstract
Preliminary estimates suggest that excess dimuon production with invariant mass in the range 1.5–2.5 GeV in nucleus–nucleus collisions can be explained on the basis of η c production. This appears to be consistent with all the peripheral and central collision data with various nuclei such as S–U at 200 GeV/nucleon except for the central collision data on Pb–Pb at 158 GeV/nucleon. Some explanations based on glueball production for Pb–Pb data are discussed.
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