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- W141006044 abstract "The NA38/NA50 experiments have measured, at the CERN SPS, the dimuon production in proton-nucleus and nucleus-nucleus collisions. In this paper it is shown that the mass continuum between the and the J/ψ can be satisfactorily described, after having removed the combinatorial background due to uncorrelated π and K decays, as a sum of two contributions, namely the Drell-Yan process and the semi-leptonic decay of pairs of charmed mesons, whose mass shape in the acceptance of the experiment has been evaluated using PYTHIA. However, in order to describe the A-B (namely S-U and Pb-Pb) mass spectra, the dimuon yield from open charm decays, which in p-A collisions is found to be consistent with direct open charm measurements from other CERN and FNAL experiments, has to be enhanced with respect to a linear extrapolation of p-A results. The size of the enhancement smoothly increases from peripheral S-U to central Pb-Pb interactions, reaching a factor ~3 in central Pb-Pb collisions. The pT distributions of the events in the mass continuum are also compatible with the hypothesis of open charm enhancement in A-B collisions." @default.
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- W141006044 date "1999-02-01" @default.
- W141006044 modified "2023-10-18" @default.
- W141006044 title "Intermediate mass dimuons in NA38/NA50" @default.