Abstract
The results in dilepton production in nucleus-nucleus collisions, collected at the CERN's heavy ions experimental program, are summarized. The measurement of the dimuon mass spectrum shows a suppression of the J/ψ relative to the continuum and an enhancement of the φ production, in central collisions. Both results are expected in the framework of the quark-gluon plasma formation, but more conventional models are also able to explain the present data.
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