  Coherent multiple scatterings of c and cbar quark pairs in the environment of
heavy ion collisions have been used in a previous work by Qiu et al.
[Qiu:1998rz] to study J/psi suppression. That model suggests that heavy quark
re-scatterings in a cold nuclear medium can completely explain the centrality
dependence of the observed J/psi suppression in Pb+Pb collisions at the SPS
[Abreu:2001kd]. Their calculations also revealed significant differences under
the assumptions of a color singlet or color octet production mechanism. A more
recent analytic calculation [Fujii:2003fq], which includes incoherent
final-state re-scatterings with explicit momentum transfer fluctuations in
three dimensions, indicates much less suppression and little sensitivity to the
production mechanism. In this article, we study simultaneously both the J/psi
suppression and p_T modifications, at SPS and RHIC energies. We mainly focus on
incoherent momentum transfer fluctuations in two dimensions, which is more
appropriate for the heavy-ion collision kinematics. Our analytic and
Monte-Carlo calculations reinforce the analytic results in [Fujii:2003fq].
Additionally, we find that the experimental J/psi suppression and <p_T^2> from
nucleus-nucleus collisions at the SPS or RHIC cannot simultaneously be
described in this incoherent multiple scattering framework for any value of the
fluctuation strength parameter <k_T^2>.
