Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Charmonium and Charmonium-like (?) States   The last few years have witnessed a renaissance in the spectroscopy of heavy
quarks. Several long elusive states have now been firmly identified, and
several unexpected states have been reported by the high luminosity experiments
at Belle, Babar, CLEO, and Fermilab. These discoveries have posed important
theoretical questions for our understanding of QCD, and a variety of
theoretical models have been proposed. These developments are critically
discussed.

28
The categories of this paper are: alg-geom
0
The categories of this paper are: hep-ph
2
The categories of this paper are: math
13
The categories of this paper are: quant-ph
37
The categories of this paper are: supr-con
12
The categories of this paper are: nucl-th
18
The categories of this paper are: econ
17
The categories of this paper are: q-fin
24
The categories of this paper are: dg-ga
34
The categories of this paper are: chem-ph
19
The categories of this paper are: eess
21
The categories of this paper are: adap-org
10
The categories of this paper are: q-bio
3
The categories of this paper are: physics
27
The categories of this paper are: comp-gas
32
The categories of this paper are: atom-ph