Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: $R_{AA}$ of $J/\psi$ near mid-rapidity in heavy ion collisions at
  $\sqrt{s_{NN}}=200$ GeV   We build up a model to reproduce the experimentally measured $R_{AA}$ of
$J/\psi$ near midrapidty in Au+Au collision at $\sqrt{s_{NN}}=200$ GeV. The
model takes into account the $J/\psi$ suppression from the quark-gluon plasma
and hadron gas as well as the nuclear absorption of primordial charmonia and
the regeneration effects at the hadronization stage, and hence is a
generalization of the two component model introduced by Grandchamp and Rapp.
The improvements in this work are twofold; the addition of the initial local
temperature profile and a consistent use of QCD NLO formula for both the
dissociation cross section in the hadron gas and the thermal decay widths in
the quark-gluon plasma for the charmonium states. The initial local temperature
profile is determined from the assumption that the local entropy density is
proportional to a formula involving the number densities of the number of
participants and of the binary collisions that reproduces the multiplicities of
charged particles at chemical freeze-out. The initial local temperature profile
brings about a kink in the $R_{AA}$ curve due to the initial melting of
$J/\psi$. The initially formed fireball, composed of weakly interacting quarks
and gluons with thermal masses that are extracted from lattice QCD, follows an
isentropic expansion with cylindrical symmetry. The fit reproduces well the
Au+Au as well as the Cu+Cu data. The same method is applied to predict the
$R_{AA}$ expected from the Pb+Pb collision at LHC energy.

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The categories of this paper are: chem-ph
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The categories of this paper are: math-ph
10
The categories of this paper are: q-bio
2
The categories of this paper are: math
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The categories of this paper are: supr-con
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The categories of this paper are: hep-ex
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The categories of this paper are: nucl-ex
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The categories of this paper are: dg-ga
7
The categories of this paper are: hep-th
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The categories of this paper are: patt-sol
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The categories of this paper are: ao-sci
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The categories of this paper are: q-alg
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The categories of this paper are: chao-dyn
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The categories of this paper are: hep-lat
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The categories of this paper are: cond-mat
0
The categories of this paper are: hep-ph