Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Evidence for psi' Regeneration in Heavy Ion Collisions   The production of the psi' meson in Pb+Pb collisions at CERN SPS is analyzed.
It provides an evidence for charmonium regeneration via charm quark-antiquark
coalescence at hadronization.

14
The categories of this paper are: math-ph
8
The categories of this paper are: hep-ex
25
The categories of this paper are: patt-sol
7
The categories of this paper are: hep-th
21
The categories of this paper are: adap-org
5
The categories of this paper are: gr-qc
31
The categories of this paper are: ao-sci
32
The categories of this paper are: atom-ph
6
The categories of this paper are: astro-ph
28
The categories of this paper are: alg-geom
30
The categories of this paper are: q-alg
29
The categories of this paper are: funct-an
20
The categories of this paper are: acc-phys
10
The categories of this paper are: q-bio
13
The categories of this paper are: quant-ph
18
The categories of this paper are: econ