Low mass dimuon production in Indium-Indium collisions at 158 A GeV
Revised: 8 March 2005
Published online: 8 July 2005
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/ 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 production cross section ratios and on the transverse momentum distributions, both as a function of collision centrality.
© Springer-Verlag, 2005