$J/ψ$ suppression and $p_T$ spectra in RHIC and LHC energy collisions

Abstract

In a hydrodynamic model, we have studied $J/ψ$ production in Au+Au/Cu+Cu collisions at RHIC energy $\sqrt{s}$=200 GeV. At the initial time, $J/ψ$'s are randomly distributed in the fluid. As the fluid evolve in time, the free streaming $J/ψ$'s are dissolved if the local fluid temperature exceeds a threshold temperature $T_{J/ψ}$. Sequential melting of charmonium states ($χ_c$, $ψ\prime$ and $J/ψ$), with melting temperatures $T_{χ_c}=T_{ψ\prime} \approx 1.2T_c$, $T_{J/ψ} \approx2T_c$ and feed-down fraction $F\approx 0.3$, explains the PHENIX data on the centrality dependence of $J/ψ$ suppression in Au+Au collisions. $J/ψ$ $p_T$ 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 $J/ψ$ suppression in Cu+Cu collisions by 20-30%. The $J/ψ$ $p_T$ spectra are under predicted by 20-30%. The model predict that in central Pb+Pb collisions at LHC energy, $\sqrt{s}$=5500 GeV, $J/ψ$'s are suppressed by a factor of $\sim$ 10. The model predicted $J/ψ$ $p_T$ distribution in Pb+Pb collisions at LHC is similar to that in Au+Au collisions at RHIC.