Abstract
Quarkonium has been regarded as one of the golden probes to identify the phase transition from confined hadronic matter to the deconfined quark-gluon plasma (QGP) in heavy-ion collisions. Recent data on the yields and momentum distributions of J/ψ and ϒ families in pp, pPb, and PbPb collisions at the Large Hadron Collider (LHC) are reviewed. The possible implications related to the propagation of quarkonia in the deconfined hot, dense matter and the modified parton distribution function (PDF) in cold nuclei are also discussed.
Highlights
Several observables have been proposed to identify and study the detailed characteristics of the phase transition from the confined hadronic matter to the deconfined quark-gluon plasma (QGP)
The quarkonium data in pPb are useful to recognize and quantify the initial-state effects, such as nuclear modification of parton distribution function (PDF), energy loss in cold nuclear matter, and pT broadening due to multiple scattering [6]
This paper summarizes some of recent experimental data on the J/ψ and Υ productions in pp, pPb, and PbPb collisions at Large Hadron Collider (LHC)
Summary
The data on the yields and momentum spectra of quarkonia may provide invaluable information on the medium temperature and the characteristics of quantum chromodynamics (QCD) in high density and temperature environment [2] Another production mechanism is the random recombination (or regeneration) of heavy quarks and their antiquarks [3]. The quarkonium data in pPb are useful to recognize and quantify the initial-state effects, such as nuclear modification of PDF, energy loss in cold nuclear matter, and pT broadening due to multiple scattering [6] These initial-state nuclear effects need to be taken into account to isolate any genuin signals caused by the high-density QCD medium in heavy-ion collisions. The implications of the data for the production mechanism, the initialand final-state effects are discussed
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