Dileptons from ${\eta }_c$ in Nucleus-Nucleus collisions

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 ${\eta }_c$ 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.

Comments: LaTeX2e, 8 pages, 5 figure files (eps), minor changes, version to appear in Phys. Lett. B