Phenomenological study of quarkonium suppression and the impact of the energy gap between singlets and octets

Abstract

The study of heavy quarkonium suppression in heavy-ion collisions represents an important source of information about the properties of the quark-gluon plasma produced in such collisions. In a previous paper, we have considered how to model the evolution of a quarkonium in such a way that the solution of the resulting equations evolves toward the correct thermal equilibrium distribution for an homogeneous and static medium. We found that it is crucial to take into account the energy gap between singlet and octet configurations when the temperature is not much greater than this energy gap. In this manuscript, we explore in more detail the phenomenological consequences of this observation in the more realistic situation of an expanding system. We consider two different scenarios, based on the same approximation scheme, but on different choices of parameters. In the first case, we rely on a Hard Thermal Loop approximation, while the second case is based on a recent determination of the static potential in lattice QCD. In both cases, we compute the decay width and the nuclear modification factor, both taking the energy gap into account and ignoring it. We find that the impact on the predictions is as large in the expanding medium as it is in the static case. Our conclusion is that this energy gap should be taken into account in phenomenological studies.

Published version. 25 pages, 11 figures

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Cited by in corpus (12)

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• Predictions for the sPHENIX physics program
• Quarkonium dynamics in the quantum Brownian regime with non-abelian quantum master equations
• The impact of fluctuating initial conditions on bottomonium suppression in 5.02 TeV heavy-ion collisions
• Bottomonium sequential suppression and strong heavy-quark potential in heavy-ion collisions
• $B_c^{+}$ Formation from Random Charm and Anti-bottom Quarks in the Quark-Gluon Plasma
• Spectral functions of heavy quarkonia in a bulk-viscous quark gluon plasma
• Bottomonium suppression at RHIC and LHC in an open quantum system approach
• Transverse momentum dependent feed-down fractions for bottomonium production
• Non-equilibrium evolution of quarkonium in medium in the open quantum system approach
• A simple model to include initial-state and hot-medium effects in the computation of quarkonium nuclear modification factor
• Non-Markovian dynamics of bottomonia in the QGP