Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Is eta' partially made of gluonium?   A phenomenological analysis of radiative $V\to P\gamma$ and $P\to V\gamma$
decays is performed in order to determine the gluonic content of the
$\eta^\prime$ wave function. Our result shows that there is no evidence for
such a gluonium contribution, $Z_{\eta^\prime}^2=0.04\pm 0.09$. In terms of a
mixing angle description this corresponds to $\phi_P=(41.4\pm 1.3)^\circ$ and
$|\phi_{\eta^\prime G}|=(12\pm 13)^\circ$.

9
The categories of this paper are: nlin
21
The categories of this paper are: adap-org
7
The categories of this paper are: hep-th
25
The categories of this paper are: patt-sol
6
The categories of this paper are: astro-ph
30
The categories of this paper are: q-alg
3
The categories of this paper are: physics
23
The categories of this paper are: solv-int
26
The categories of this paper are: bayes-an
4
The categories of this paper are: cond-mat
19
The categories of this paper are: eess
35
The categories of this paper are: mtrl-th
12
The categories of this paper are: nucl-th
11
The categories of this paper are: hep-lat
37
The categories of this paper are: supr-con
28
The categories of this paper are: alg-geom