Abstract
The ALICE Collaboration has measured the inclusive J/ψ production at forward rapidity in pp, p-Pb and Pb-Pb collisions at the LHC. The pp measurements are crucial for a deeper understanding of the physics involving hadroproduction processes and provide the baseline for p-Pb and Pb-Pb measurements. The comparison of the results on the nuclear modification factor in p-Pb collisions as a function of rapidity or transverse momentum with theoretical predictions shows a fair agreement with a shadowing based model and energy loss models with or without a shadowing contribution. The nuclear modification factor in Pb-Pb as a function of collision centrality or transverse momentum shows a weaker suppression than at lower energies and can be described by statistical hadronization or transport models, suggesting a contribution to the J/ψ production due to the (re)combination of charm quarks, especially at low transverse momentum. The extrapolation to Pb-Pb collisions of the cold nuclear matter effects evaluated in p-Pb collisions supports the (re)combination mechanism interpretation.
Highlights
ALICE is the LHC experiment dedicated to the study of heavy-ion collisions
The experimental results in Pb-Pb collisions at LHC energies have revealed that other effects like quarkonium regeneration, in the Quark-Gluon Plasma (QGP) or at the boundary with the hadronic phase, may contribute to the charmonium production
In order to measure the effects related to cold nuclear matter (CNM), p-Pb collisions have been studied at the LHC
Summary
ALICE is the LHC experiment dedicated to the study of heavy-ion collisions. The peculiar properties of some of the charmonium states, like their small size (< 1 fm), strong binding energy (several hundred MeV) and large mass of the charm quarks, make them ideal probes of the strongly interacting Quark-Gluon Plasma (QGP) produced in high-energy heavy-ion collisions. Results on the inclusive J/ψ production at forward rapidity, such as the nuclear modification factor as a function√of transverse momentum (pT) in p-Pb collisions at a centre-of-mass energy pe√r nucleon pair sNN = 5.02 TeV, and the nuclear modification factor in Pb-Pb collisions at sNN = 2.76 TeV as a function of centrality or pT are presented and compared to theoretical models.
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