Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Masses of singlet and non-singlet 0++ particles   We compute the mass of the singlet 0++ state using both (psi_bar psi) and
Wilson loop operators from a N_f=2 lattice QCD calculation.

15
The categories of this paper are: nucl-ex
14
The categories of this paper are: math-ph
13
The categories of this paper are: quant-ph
8
The categories of this paper are: hep-ex
31
The categories of this paper are: ao-sci
2
The categories of this paper are: math
24
The categories of this paper are: dg-ga
1
The categories of this paper are: cs
22
The categories of this paper are: chao-dyn
4
The categories of this paper are: cond-mat
12
The categories of this paper are: nucl-th
23
The categories of this paper are: solv-int
9
The categories of this paper are: nlin
17
The categories of this paper are: q-fin
21
The categories of this paper are: adap-org
3
The categories of this paper are: physics