Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Scalar Mesons in a Relativistic Quark Model with Instanton-Induced
  Forces   In a relativistic quark model with linear confinement and an
instanton-induced interaction which solves the $\eta$-$\eta'$ puzzle, scalar
mesons are found as almost pure SU(3) flavor states. This suggests a new
interpretation of the scalar nonet: We propose that the recently discovered
$f_0(1500)$ is not a glueball but the scalar (mainly)--octet meson for which
the $K\bar{K}$ decay mode is suppressed. The mainly--singlet state is
tentatively identified with the $f_0(980)$. The isovector and isodoublet states
correspond to the $a_0(1450)$ and $K^{\ast}(1430)$, respectively.

18
The categories of this paper are: econ
26
The categories of this paper are: bayes-an
9
The categories of this paper are: nlin
25
The categories of this paper are: patt-sol
15
The categories of this paper are: nucl-ex
10
The categories of this paper are: q-bio
33
The categories of this paper are: plasm-ph
35
The categories of this paper are: mtrl-th
4
The categories of this paper are: cond-mat
29
The categories of this paper are: funct-an
30
The categories of this paper are: q-alg
37
The categories of this paper are: supr-con
36
The categories of this paper are: cmp-lg
22
The categories of this paper are: chao-dyn
16
The categories of this paper are: stat
11
The categories of this paper are: hep-lat