Quarkonia and Deconfined Quark–Gluon Matter in Heavy-Ion Collisions

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In this article, we present an experimental overview of quarkonium results obtained in nucleus–nucleus collisions with a focus on the data collected at the LHC. We discuss the current understanding of charmonium and bottomonium behavior in the deconfined medium produced in such collisions, and we compare the currently accessible observables with predictions from state-of-the-art theoretical models. We also discuss the open questions and explain how future heavy-ion experiments aim to clarify these aspects.