The heavy quark–antiquark pair separation is shown as a function of temperature at fixed chemical potential and as a function of chemical potential at fixed temperature (IMAGE)
Caption
The separation between the heavy quark–antiquark pair increases with Z0 until reaching a peak (referred to as the dissociation distance Lmax ), at which point heavy quarkonium dissociates. As temperature and chemical potential rise, the dissociation distance Lmax gradually decreases. This is because the parton density in the medium increases with higher temperature and chemical potential, thereby enhancing the screening effect on the bound state of heavy quarkonium. Consequently, the reduction in dissociation distance makes it easier for the heavy quark–antiquark pair to transition into a deconfined state and become free quarks.
Credit
Zhou Kai
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CC BY-NC