# Charmonium production in Pb-Pb collisions at ALICE: from suppression to regeneration ?

- Institution: CERN
- Department: LHC Seminar
- Speaker: Enrico Scomparin
- Year: 2012
- Language: English
- Source: [CERN](https://videos.cern.ch/record/3011858)
- Licence: [CERN](http://copyright.web.cern.ch)
- Who can watch: Teens profiles and older (sources give no ratings; placed by Invisible Network from the source's own words)

Heavy quarkonium states are considered as one of the key observables for the study of the phase transition from a system made of hadrons towards a Quark-Gluon Plasma. In the last 25 years, experiments at CERN and Brookhaven have studied collisions of heavy ions looking for a suppression of charmonia/bottomonia, considered as a signature of the phase transition. After an introduction to the main concepts behind these studies, I will present the results obtained in Pb-Pb collisions by the ALICE experiment. The ALICE results will be critically compared to those of lower energy experiments, to CMS/ATLAS results, and to various model calculations. The large cross sections for heavy-quark production at LHC energies are expected to induce a novel production mechanism for charmonia in heavy-ion collisions, related to a (re)combination of ccbar pairs along the history of the collision and/or at hadronization. The occurrence of such a process at the LHC will be discussed. Finally, prospects for future measurements will be addressed..

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## Lectures

1. [Charmonium production in Pb-Pb collisions at ALICE: from suppression to regeneration ?](https://invisiblenetwork.ai/learn/cern/3011858/18ada393c38b), 1 h 1 min (CERN's player)