Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Cold and hot nuclear matter effects on $J/\psi$ production at RHIC-BES
  energies   Integrated and differential $J/\psi\ R_{AA}$ are systematically studied in
Au-Au collisions at RHIC-BES energies in a transport approach, including cold
and hot nuclear effects respectively in the initial condition and the collision
terms. With decreasing energy, while the temperature, life time and size of the
QGP fireball decrease, the nuclear absorption of the initially produced
charmonia is more and more strong, and the nuclear shadowing effect on
charmonium regeneration goes to anti-shadowing first and then to shadowing
again. As a competition between the cold and hot nuclear effects, the QGP phase
is still important for charmonium production at $\sqrt{s_{NN}}$=200, 62.4, 54.4
and 39 GeV but becomes negligible at $\sqrt{s_{NN}}$=14.5 GeV.

10
The categories of this paper are: q-bio
13
The categories of this paper are: quant-ph
15
The categories of this paper are: nucl-ex
29
The categories of this paper are: funct-an
9
The categories of this paper are: nlin
1
The categories of this paper are: cs
16
The categories of this paper are: stat
33
The categories of this paper are: plasm-ph
7
The categories of this paper are: hep-th
30
The categories of this paper are: q-alg
18
The categories of this paper are: econ
23
The categories of this paper are: solv-int
21
The categories of this paper are: adap-org
37
The categories of this paper are: supr-con
24
The categories of this paper are: dg-ga
32
The categories of this paper are: atom-ph