Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nucleon pole contributions in $J/\psi\to N \bar{N} \pi$, $p \bar{p}
  \eta$, $p \bar{p} \eta^{\prime}$ and $p \bar{p} \omega$ decays   Nucleon pole contributions in $J/\psi \to N \bar N \pi$, $p \bar p \eta$, $p
\bar p \eta^{\prime}$ and $p \bar{p} \omega$ decays are re-studied. Different
contributions due to PS-PS and PS-PV couplings in the $\pi$-N interaction and
the effects of $NN\pi$ form factors are investigated in the $J/\psi \to N \bar
N \pi$ decay channel. It is found that when the ratio of $|F_0| /|F_M|$ takes
small value, without considering the $NN\pi$ form factor, the difference
between PS-PS and PS-PV couplings are negligible. However, when the $NN\pi$
form factor is included, this difference is greatly enlarged. The resultant
decay widths are sensitive to the form factors. As a conclusion, the
nucleon-pole contribution as a background is important in the $J/\psi\to
N\bar{N}\pi$ decay and must be accounted. In the $J/\psi\to N\bar{N}\eta$ and
$N\bar{N}\eta'$ decays, its contribution is less than 0.1% of the data. In the
$J/\psi\to N\bar{N}\omega$ decay, it provides rather important contribution
without considering form factors. But the contribution is suppressed greatly
when adding the off-shell form factors. Comparing these results with data would
help us to select a proper form factor for such kind of decay.

31
The categories of this paper are: ao-sci
37
The categories of this paper are: supr-con
7
The categories of this paper are: hep-th
34
The categories of this paper are: chem-ph
21
The categories of this paper are: adap-org
11
The categories of this paper are: hep-lat
1
The categories of this paper are: cs
13
The categories of this paper are: quant-ph
33
The categories of this paper are: plasm-ph
2
The categories of this paper are: math
3
The categories of this paper are: physics
17
The categories of this paper are: q-fin
36
The categories of this paper are: cmp-lg
26
The categories of this paper are: bayes-an
22
The categories of this paper are: chao-dyn
32
The categories of this paper are: atom-ph