Nuclear absorption and $J/\psi$ suppression in Pb+Pb collisions

Abstract

We have analyzed the NA58 data on $J/\psi$ suppression in Pb+Pb collisions. $J/\psi$ production is assumed to be a two step process, (i) formation of $c\bar{c}$ pair, which is accurately calculable in QCD and (ii) formation of $J/\psi$ meson from the $c\bar{c}$ pair, which can be conveniently parameterized. In a pA/AA collision, a $c\bar{c}$ pair gain relative square momentum as it passes through the nuclear medium and some of the $c\bar{c}$ pairs can gain enough momentum to cross the threshold to become an open charm meson, leading to suppression in pA/AA collisions. A new prescription is proposed for the gain in momentum square, consistent with Krammer process. The model without any free parameter could explain the $E_T$ dependence of $J/\psi$ over Drell-Yan ratio.

4 pages including 2 figurs

References in corpus (4)

• $J/\psi$ suppression in Pb+Pb collisions, a conventional description
• J/$\psi$ production and suppression in nuclear collisions
• Transverse energy distributions and $J/\psi$ production in Pb+Pb collisions
• Transverse energy dependence of J/Psi suppression in Au+Au collisions at RHIC energy

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• J/Psi production in proton induced collisions at FAIR
• Temperature dependent formation-time approach for ${\rm Y}$ suppression at energies available at the CERN Large Hadraon Collider
• pQCD approach to Charmonium regeneration in QGP at the LHC
• J/$\psi$ suppression in a dense baryonic medium
• Nuclear absorption of Charmoniums in pA and AA collisions
• Threshold model and the latest NA50 data on $J/\psi$ suppression in Pb+Pb collisions
• $\Psi (2s)$ production in $p+A$ collisions
• Statistical hadronization phenomenology in heavy ion collisions at SPS and RHIC energies