Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2008-08-20
Eur.Phys.J.C61:331-338,2009
Physics
Nuclear Physics
Nuclear Theory
8 pages, 7 figures
Scientific paper
10.1140/epjc/s10052-009-0963-9
In a hydrodynamic model, we have studied $J/\psi$ production in Au+Au/Cu+Cu collisions at RHIC energy $\sqrt{s}$=200 GeV. At the initial time, $J/\psi$'s are randomly distributed in the fluid. As the fluid evolve in time, the free streaming $J/\psi$'s are dissolved if the local fluid temperature exceeds a threshold temperature $T_{J/\psi}$. Sequential melting of charmonium states ($\chi_c$, $\psi\prime$ and $J/\psi$), with melting temperatures $T_{\chi_c}=T_{\psi\prime} \approx 1.2T_c$, $T_{J/\psi} \approx2T_c$ and feed-down fraction $F\approx 0.3$, explains the PHENIX data on the centrality dependence of $J/\psi$ suppression in Au+Au collisions. $J/\psi$ $p_T$ spectra and the nuclear modification factor in Au+Au collisions are also well explained in the model. The model however over predict centrality dependence of $J/\psi$ suppression in Cu+Cu collisions by 20-30%. The $J/\psi$ $p_T$ spectra are under predicted by 20-30%. The model predict that in central Pb+Pb collisions at LHC energy, $\sqrt{s}$=5500 GeV, $J/\psi$'s are suppressed by a factor of $\sim$ 10. The model predicted $J/\psi$ $p_T$ distribution in Pb+Pb collisions at LHC is similar to that in Au+Au collisions at RHIC.
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