and Drell-Yan cross-sections in PbPb interactions at 158 GeV/c per nucleon

Overview of hard processes at RHIC: high-pTlight-hadron and charm production

“…In the absence of nuclear effects the hard production yields in nucleus-nucleus collisions are therefore expected to scale as if the collision were an independent superposition of nucleonnucleon collisions. Measurements at SPS have shown that dilepton production in the Drell-Yan process indeed follows this expectation [1].…”

Pseudorapidity distributions of charged particles as a function of centrality in Pb–Pb collisions at 158 and 40 GeV per nucleon incident energy

“…The complete detector setup has been presented elsewhere [5]. Here we give some details only on the detectors relevant for the present analysis, as shown in Fig.…”

Another look at anomalous J/$Psi; suppression in Pb + Pb collisions at P/A = 158 GeV/c

“…A normalization factor had to be introduced to get the (b 2 ) e values in units of fm 2 . It has been adjusted in such a way that the dependence of (b 2 ) e upon E T agrees with the correlation between the average values of E T and b listed in NA50 publications [1,5] for successive E T slices, as fitted on the basis of a Glauber model calculation. These average values are also shown in the bottom part of Fig.…”

“…Very interesting results have been obtained recently by the NA50 experiment at CERN concerning J/Ψ production in Pb + Pb collisions at P/A = 158 GeV/c [1,2,3,4,5]. In most central collisions, the J/Ψ events are significantly suppressed with respect to what is expected from normal nuclear absorption as measured in lighter systems [2,3,4,5].…”

“…In the usual presentation of NA50 results concerning J/Ψ production in nucleus-nucleus collisions [1,2,3,4], the ratio between J/Ψ and Drell-Yan events is plotted as a function of the transverse energy E T measured in an electromagnetic calorimeter. This centrality variable is aimed primarily at sorting out all events according to the impact parameter of the collision.…”