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Gluonic Dissociation Revisited : II . Hydrodynamic Expansion Effects

We explicitly take into account the effect of hydrodynamic expansion profile on the gluonic breakup of J/ψ’s produced in an equilibrating parton plasma. Attention is paid to the space-time inhomogeneities as well as Lorentz frames while deriving new expressions for the gluon number density ng, average dissociation rate 〈Γ̃〉, and ψ survival probability S. A novel type of partial wave interference mechanism is found to operate in the formula of 〈Γ̃〉. Nonrelativistic longitudinal expansion fro small length of the initial cylinder is found to push the S(pT ) graph above the no flow case considered by us earlier [9]. However, relativistic flow corresponding to large length of the initial cylinder pushes the curve of S(pT ) downwards at LHC but upwards at RHIC. This mutually different effect on S(pT ) may be attributed to the different initial temperatures generated at LHC and RHIC. PACS numbers: 12.38M