Charmonium production in Pb-Pb interactions at 158 GeV/c per nucleon

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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 originaleInglese
pagine (da-a)261c-278c
RivistaNuclear Physics A
Volume638
Numero di pubblicazione1-2
DOI
Stato di pubblicazionePubblicato - 10 ago 1998

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