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Energy dependence of J/psi production in Au+Au collisions at sqrt{s_(NN)} = 39, 62.4 and 200 GeV
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arxiv 1607.07517 v1 pith:DWCCR3OJ submitted 2016-07-26 hep-ex nucl-ex
Energy dependence of J/psi production in Au+Au collisions at sqrt{s_(NN)} = 39, 62.4 and 200 GeV
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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.
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