Abstract
The brief review of the experimental data on quarkonium productions measured at the CERN SPS, at the Brookhaven Collider RHIC, and at the LHC is presented. The dissociation of quarkonium resonances produced in heavy ion collisions was suggested as a possible signal of the Quark-Gluon Plasma formation. At the CERN SPS, the anomalous suppression of theJ/ψproduction was observed in central Pb-Pb collisions by the NA50 collaboration. However, the effects ofJ/ψsuppression on cold nuclear matter, feed-down production from higher charmonium states, and regeneration processes should be taken into account. If proton and ion beams at the LHC will be used with fixed targets, the energy interval between the SPS energy and the nominal RHIC energy (200 GeV) could be investigated. The high statistics data on quarkonium productions at these energies will give the possibility of clarifying the mechanism of charmonium productions to investigate the importance of the recombination process, since the probability of recombination decreases with decreasing the energy of collisions.
Highlights
The existence of the Quark-Gluon Plasma (QGP) is predicted by lattice Quantum Chromodynamics (QCD) at high temperature and large energy density
Quarkonium productions have been previously studied at the CERN SPS by NA38 [2], NA50 [3,4,5,6,7], and NA60 [8, 9] experiments, at the FNAL [10], and by fixed target p-A experiments at the HERA-B [11]
It was shown that the J/ψ suppression measured by PHENIX experiment at √s = 200 GeV is of the same order as the suppression at the SPS energies for Pb-Pb collisions [13, 20]
Summary
The existence of the Quark-Gluon Plasma (QGP) is predicted by lattice QCD at high temperature and large energy density. The high statistics measurements at the LHC could investigate the properties of matter at high energy density and temperature. Advances in High Energy Physics in order to investigate the mechanism of production, the medium effects, and conditions for the Quark-Gluon Plasma formation. If it would be possible to use the proton and ion beams at the LHC with fixed targets, the data in the energy interval between maximum energy of the SPS (√s ∼ 29 GeV) and the nominal RHIC energy (√s = 200 GeV) in pA and A-A collisions could be obtained. The high statistics data on quarkonium production at these energies will give the possibility of clarifying the mechanism of charmonium production to investigate the importance of recombination process, since the probability of recombination decreases with decreasing the energy of collisions
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