Energy dependence of $J/\psi$ production in Au+Au collisions at $\sqrt{s_{NN}}=$ 39, 62.4 and 200 GeV

Abstract

The inclusive $J/\psi$ transverse momentum ($p_T$) spectra and nuclear modification factors are reported at midrapidity ($|y|<1.0$) in Au+Au collisions at $\sqrt{s_{NN}}=$ 39, 62.4 and 200 GeV taken by the STAR experiment. A suppression of $J/\psi$ production, with respect to {\color{black}the production in $p+p$ scaled by the number of binary nucleon-nucleon collisions}, is observed in central Au+Au collisions at these three energies. No significant energy dependence of nuclear modification factors is found within uncertainties. The measured nuclear modification factors can be described by model calculations that take into account both suppression of direct $J/\psi$ production due to the color screening effect and $J/\psi$ regeneration from recombination of uncorrelated charm-anticharm quark pairs.

References in corpus (5)

• Big-Bang Nucleosynthesis
• Glauber Modeling in High Energy Nuclear Collisions
• Systematic Measurements of Identified Particle Spectra in pp, d+Au and Au+Au Collisions from STAR
• Charmonium in Medium: From Correlators to Experiment
• The STAR Vertex Position Detector

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