Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Study of the $\eta\pi$ and $\eta'\pi$ spectra and interpetation of
  possible exotic $J^{PC}=1^{-+}$ mesons   We discuss a coupled channel analysis of the $\eta\pi$ and $\eta'\pi$ systems
produced in $\pi^-p$ interactions at 18 GeV/$c$. We show that known $Q\bar Q$
resonances, together with residual soft meson-meson rescattering, saturate the
spectra including the exotic $J^{PC}=1^{-+}$ channel. A possibility of a narrow
exotic resonance at a mass near 1.6 GeV/$c^2$ cannot, however, be ruled out.

25
The categories of this paper are: patt-sol
29
The categories of this paper are: funct-an
10
The categories of this paper are: q-bio
17
The categories of this paper are: q-fin
15
The categories of this paper are: nucl-ex
13
The categories of this paper are: quant-ph
11
The categories of this paper are: hep-lat
33
The categories of this paper are: plasm-ph
8
The categories of this paper are: hep-ex
26
The categories of this paper are: bayes-an
6
The categories of this paper are: astro-ph
31
The categories of this paper are: ao-sci
32
The categories of this paper are: atom-ph
14
The categories of this paper are: math-ph
2
The categories of this paper are: math
7
The categories of this paper are: hep-th