Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A rational approach to $\eta$ and $\eta^\prime$ transition form factors   The $\eta$ and $\eta^\prime$ transition form factors in the space-like region
are analyzed at low and intermediate energies in a model-independent way
through the use of rational approximants. The slope and curvature parameters of
the form factors as well as their values at infinity are extracted from
experimental data. The impact of these results on the mixing parameters of the
$\eta$-$\eta^\prime$ system are also discussed.

37
The categories of this paper are: supr-con
19
The categories of this paper are: eess
32
The categories of this paper are: atom-ph
25
The categories of this paper are: patt-sol
1
The categories of this paper are: cs
23
The categories of this paper are: solv-int
36
The categories of this paper are: cmp-lg
21
The categories of this paper are: adap-org
9
The categories of this paper are: nlin
11
The categories of this paper are: hep-lat
6
The categories of this paper are: astro-ph
5
The categories of this paper are: gr-qc
24
The categories of this paper are: dg-ga
35
The categories of this paper are: mtrl-th
17
The categories of this paper are: q-fin
2
The categories of this paper are: math