$J/ψ$ suppression and QCD phase diagram

Abstract

QCD phase diagram is obtained by analysing centrality dependence of $J/ψ$ suppression in $\snn$=17.3 Pb+Pb and $\snn$=200 GeV Au+Au collisions. $J/ψ$'s produced in initial interactions are assumed to dissolve if local temperature exceeds a threshold temperature. The threshold temperature depends on the (local) fluid temperature and baryonic chemical potential, which are obtained, under certain assumptions, from experimentally determined quantities e.g. rapidity density, net baryon density. QCD critical line with curvature parameter $κ\approx 0.018-0.23$ is consistent with experimental $J/ψ$ data. $κ$ is factor of $\sim$3 larger than in lattice QCD calculations.

Extensively revised. Focus on QCD phase diagram from experimental $J/ψ$ data in SPS and RHIC energy. 4 pages, 3 figures