Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The role of $N^{*}(1535)$ in $\eta '$ production   We study the near-threshold $\eta '$ production mechanism in nucleon-nucleon
and $\pi N$ collisions under the assumption that sub-threshold resonance
$N^{*}(1535)$ is predominant. In an effective Lagrangian approach which gives a
reasonable description to the $pN \to pN \eta$ and $\pi p \to p \eta$
reactions, it is found that t-channel $\pi$ exchange make the dominate
contribution to the $pN \to pN \eta '$ process, and a value of 6.5 for the
ratio of $\sigma (pn \to pn \eta ')$ to $\sigma (pp \to pp \eta ')$ is
predicted. A strong coupling strength of $N^{*}(1535)$ to $\eta ' N$ ($g_{\eta
' NN^*}^2 /4\pi = 1.1$) is extracted from a combined analysis to $pp \to pp
\eta '$ and $\pi N \to N \eta '$, and the possible implication to the intrinsic
component of $N^{*}(1535)$ is explored.

23
The categories of this paper are: solv-int
0
The categories of this paper are: hep-ph
5
The categories of this paper are: gr-qc
3
The categories of this paper are: physics
36
The categories of this paper are: cmp-lg
30
The categories of this paper are: q-alg
32
The categories of this paper are: atom-ph
2
The categories of this paper are: math
7
The categories of this paper are: hep-th
9
The categories of this paper are: nlin
31
The categories of this paper are: ao-sci
4
The categories of this paper are: cond-mat
11
The categories of this paper are: hep-lat
24
The categories of this paper are: dg-ga
6
The categories of this paper are: astro-ph
21
The categories of this paper are: adap-org