Speaker
Dr
Anton Andronic
(GSI Darmstadt)
Description
Among the various suggested probes of deconfinement, charmonium states play a distinctive role. J/psi is the first hadron for which a clear mechanism of suppression (melting) in deconfined matter was proposed early on, based on the color analogue of Debye screening. The ALICE measurements of J/psi production in Pb-Pb collisions are performed as a function of collision centrality, transverse momentum and rapidity. The nuclear modification factor of J/psi production shows that, at the LHC, there is an enhanced relative production at low transverse momentum compared to that at lower energies. Corroborated with the measurements of open charm hadrons, which will also be discussed, the charmonium results hint at a production in a thermalized hot medium. Comparisons to model predictions indicate that J/psi production occurs in deconfined matter or at hadronization.
| Presentation Type | Invited talk |
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Primary author
Dr
Anton Andronic
(GSI Darmstadt)
