Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The processes $e^{+}e^{-} \to \pi\pi(\pi')$ in the extended NJL model   The process $e^{+}e^{-} \to \pi^{+}\pi^{-}$ is described in the framework of
the extended NJL model. Intermediate vector mesons $\rho^0(770)$, $\omega(782)$
and \rho'(1450)$ are taken into account. Our results are in satisfactory
agreement with experimental data. The prediction for the process $e^{+}e^{-}
\to \pi\pi'(1300)$ is given. Here the main contribution is given by the diagram
with intermediate $\rho'(1450)$ meson.

20
The categories of this paper are: acc-phys
21
The categories of this paper are: adap-org
24
The categories of this paper are: dg-ga
18
The categories of this paper are: econ
22
The categories of this paper are: chao-dyn
27
The categories of this paper are: comp-gas
6
The categories of this paper are: astro-ph
25
The categories of this paper are: patt-sol
35
The categories of this paper are: mtrl-th
15
The categories of this paper are: nucl-ex
4
The categories of this paper are: cond-mat
10
The categories of this paper are: q-bio
29
The categories of this paper are: funct-an
32
The categories of this paper are: atom-ph
7
The categories of this paper are: hep-th
8
The categories of this paper are: hep-ex