Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2007-02-16
Phys.Lett.B655:241-244,2007
Physics
Nuclear Physics
Nuclear Theory
4 pages, 3 figures. In the revised version (to be published in Phys.Lett.B) few discussions are added. Some misprints are also
Scientific paper
10.1016/j.physletb.2007.08.086
In the QGP motivated threshold model, in addition to the normal nuclear absorption, $J/\psi$'s are subjected to an additional "anomalous" suppression. We have analysed the recently published PHENIX data on the participant number dependence of the nuclear modification factor for $J/\psi$'s in Au+Au collisions and extracted the anomalous suppression required to explain the data. At mid rapidity $J/\psi$'s are anomalously suppressed only above a threshold density $n_c$=3.73 fm$^{-2}$. The forward rapidity data on the otherhand require that $J/\psi$'s are continuously "anomalously" suppressed. The analysis strongly indicate that in mid rapidity $J/\psi$'s are suppressed in a deconfined medium. Using the PHENIX data on the participant number dependence of the Bjorken energy density, we have also estimated the QGP formation time. For critical temperature $T_c$=192 MeV, estimated QGP formation time ranges between 0.06-0.08 fm/c.
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