Approach to equilibrium of a quarkonium in a quark-gluon plasma
Blaizot, J.-P., & Escobedo Espinosa, M. (2018). Approach to equilibrium of a quarkonium in a quark-gluon plasma. Physical Review D, 98(7), Article 074007. https://doi.org/10.1103/PhysRevD.98.074007
Published inPhysical Review D
© Authors, 2018
We derive equations of motion for the reduced density matrix of a heavy quarkonium in contact with a quark-gluon plasma in thermal equilibrium. These equations allow in particular a proper treatment of the regime when the temperature of the plasma is comparable to the binding energy of the quarkonium. These equations are used to study how the quarkonium approaches equilibrium with the plasma, and we discuss the corresponding entropy increase, or free energy decrease, depending on the temperature regime. The effect of collisions can be accounted for by the generalization of the imaginary potential introduced in previous studies, and from which collision rates are derived. An important outcome of the present analysis is that this imaginary potential has a sizable dependence on the energy of the relevant transitions.
PublisherAmerican Physical Society
Publication in research information system
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Related funder(s)Academy of Finland
Funding program(s)Research costs of Academy Research Fellow, AoF
Additional information about fundingThis work has been supported in part by the European Research Council under the Advanced Investigator Grant No. ERC-AD-267258. The work of M. A. E. was supported by the Academy of Finland, Project No. 303756.
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