Abstract
The NA60 experiment studies open charm and prompt dimuon production in proton-nucleus and nucleus-nucleus collisions at the CERN SPS. During 2003 the experiment collected data in Indium- Indium collisions at 158 GeV per nucleon. Almost 240 million dimuon events were recorded. New results on J/ψ suppression, open-charm production and low mass dimuons should help clarify some interesting questions left open by previous experiments. After a brief detector description, this paper focuses on the analysis of the low mass dimuons. Preliminary results are presented on the φ/ω production cross section ratios and on the φ transverse momentum distributions, both as a function of collision centrality. PACS. 25.75.Dw 25.75.Nq
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