The quartz-fiber calorimeters for the NA50 and ALICE experiments

Suppression

“…with impact parameter b < 8 − 8.5 fm, a stronger suppression is observed [ 3]: this anomalous suppression is the candidate as a signal of deconfined matter production at SPS. Recent NA60 data in In-In collisions confirmed the departure from the normal absorption in central collisions, with a pattern very similar to the one observed in Pb-Pb [ 5]. Surprisingly, also the first data from PHENIX (RHIC) show a suppression of the J/ψ meson comparable with what observed at SPS energies [ 6,7], while the common expectation pointed to a much stronger one.…”

“…However the model fails in describing the In-In results obtained by the NA60 Collab. [ 5]: the suppression predicted by the DPM is much stronger than what is observed, signaling that the effect of the collision term in Eq.3 is too strong: one could try to reduce it by refitting the parameters, but then the agreement with Pb-Pb data would be lost. The same problem occurs at RHIC energies, where the experimental data are largely underestimated by the theoretical curve [ 13].…”

Heavy Flavor, Quarkonia, and Electroweak Probes at Quark Matter 2012

“…Comparison to model calculations indicates that recombination plays a more significant role at LHC [8]. Furthermore, the p T dependence of J/ψ suppression [22,23,24], the flow pattern of J/ψ as a function of p T [25,26], and the high p T J/ψ suppression pattern as a function of centrality [24,27], reported at LHC and RHIC, can be described consistently by model calculations incorporating color screening and recombination features. We note that substantial suppression observed at high p T points to the color screening feature since the recombination and cold nuclear matter effects are negligible there.…”

“…Figure 5 shows systematic comparisons of J/ψ suppression patterns at RHIC and LHC. In central collisions, J/ψ is less suppressed in Pb+Pb at 2.76 TeV for 2.5 < |y| < 4 than in Au+Au collisions at 200 GeV for 1.2 < |y| < 2.2 [21,22]. A similar feature is observed for mid-rapidity comparisons between LHC and RHIC energies.…”

Proton-Proton Physics With the Alice Muon Spectrometer at the LHC

“…Recent investigations have demonstrated the capabilities of the ALICE muon spectrometer to measure this observable in p-p collisions at √ s = 14 TeV, even with a limited statistics. 10 …”