Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spontaneous Generation of Pseudoscalar Mass in the U(3)xU(3) Linear
  Sigma Model   A novel, nonperturbative, way to generate chiral symmetry breaking within the
linear sigma model for 3 flavours is discussed. After spontaneous chiral
symmetry breaking in the vacuum at the tree level the scalar nonet obtains
mass, while the pseudoscalars are massless. Then, including quantum loops in a
nonperturbative, self-consistent way chiral symmetry is broken by nonplanar
graphs in a second step, and also the pseudoscalars become massive. By
interpreting the basic symmetry to be a discrete permutation symmetry, in
accord with superselection rules, no additional Goldstone bosons are expected.

23
The categories of this paper are: solv-int
14
The categories of this paper are: math-ph
21
The categories of this paper are: adap-org
31
The categories of this paper are: ao-sci
5
The categories of this paper are: gr-qc
37
The categories of this paper are: supr-con
25
The categories of this paper are: patt-sol
16
The categories of this paper are: stat
34
The categories of this paper are: chem-ph
10
The categories of this paper are: q-bio
4
The categories of this paper are: cond-mat
6
The categories of this paper are: astro-ph
11
The categories of this paper are: hep-lat
29
The categories of this paper are: funct-an
35
The categories of this paper are: mtrl-th
8
The categories of this paper are: hep-ex