Abstract
The NA50 collaboration has measured J/ψ, ψl and Drell-Yan pair production in Pb-Pb interactions at 158 GeV/c per nucleon at the CERN SPS. Final results from the 1995 run and preliminary ones from the higher statistics 1996 run are presented. An anomalous J/ψ suppression (relative to the Drell-Yan process) has been observed with respect to the suppression pattern established in experiments NA38 and NA51 with proton, oxygen and sulfur beams. The 1996 data allow a detailed study of the suppression pattern in the Pb-Pb sample itself, showing a discontinuity around an ET value (the neutral transverse electromagnetic energy) of 50 GeV. The ψl is also suppressed relative to Drell-Yan, with a pattern very similar to the one observed in S-U collisions. Finally, the pT distributions of dimuons are presented. The average p2T of the J/ψ in Pb-Pb collisions does not increase any more with ET above 100 GeV.
Lingua originale | Inglese |
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pagine (da-a) | 261c-278c |
Rivista | Nuclear Physics A |
Volume | 638 |
Numero di pubblicazione | 1-2 |
DOI | |
Stato di pubblicazione | Pubblicato - 10 ago 1998 |