Elsevier

Physics Reports

Volume 858, 10 May 2020, Pages 1-117
Physics Reports

Heavy quarkonium in extreme conditions

https://doi.org/10.1016/j.physrep.2020.02.006Get rights and content
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Highlights

  • Lattice QCD confirms QQ̄ in-medium modification ordered by vacuum binding energy.

  • Vital properties of quarkonium at T>0 revealed by the QCD complex in-medium potential.

  • Open quantum systems capture quarkonium real-time dynamics from 1st principles.

  • Quarkonium melting represents quantum decoherence involving screening and scattering.

  • QQ̄ suppression in heavy-ion collisions as interplay of melting & recombination.

Abstract

In this report we review recent progress achieved in the understanding of heavy quarkonium under extreme conditions from a theory perspective. Its focus lies both on quarkonium properties in thermal equilibrium, as well as recent developments towards a genuine real-time description, valid also out-of-equilibrium. We will give an overview of the theory tools developed and deployed over the last decade, including effective field theories, lattice field theory simulations, modern methods for spectral reconstructions and the open quantum systems paradigm. The report will discuss in detail the concept of quarkonium melting, providing the reader with a contemporary perspective. In order to judge where future progress is needed we will also discuss recent results from experiments and phenomenological modeling of quarkonium in relativistic heavy-ion collisions.

Keywords

Quarkonium
In-medium
Lattice QCD
Effective field theory
Open quantum systems

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