# Quarkonium production in A-A and p-A collisions

## TL;DR

This paper reviews recent high-precision measurements of quarkonium suppression in heavy-ion collisions at LHC and RHIC, highlighting their implications for understanding Quark-Gluon Plasma formation.

## Contribution

It provides an updated synthesis of experimental results on quarkonium production and suppression, comparing them with theoretical models to enhance understanding of medium effects in nuclear collisions.

## Key findings

- New measurements show detailed suppression patterns of quarkonium states.
- Data suggest complex medium effects influencing quarkonium yields.
- Results are consistent with Quark-Gluon Plasma formation signatures.

## Abstract

Thirty years ago, the suppression of quarkonium production in heavy-ion collisions was first proposed as an unambiguous signature for the formation of a Quark-Gluon Plasma. Recent results from the LHC run 2 have led to an unprecedented level of precision on this observable and, together with new data from RHIC, are providing an accurate picture of the influence of the medium created in nuclear collisions on the various charmonium (J/$\psi$, $\psi$(2S)) and bottomonium ($\Upsilon(1S)$, $\Upsilon(2S)$, $\Upsilon(3S)$) states, studied via their decay into lepton pairs. In this contribution, I will review the new results presented at Quark Matter 2017, emphasizing their relation with previous experimental observations and comparing them, where possible, with theoretical calculations.