Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: An overview of $\eta$ and $\eta^{\prime}$ decays at BESIII   The world's largest sample of 1.31 billion $J/\psi$ events accumulated at the
BESIII detector, provides a unique opportunity to investigate $\eta$ and
$\eta^\prime$ physics via two body $J/\psi$ radiative or hadronic decays. For
many $\eta^\prime$ decay channels the low background data samples are up to
three orders of magnitude larger than collected in any previous experiment.
Here we review the most significant results on $\eta$ and $\eta^\prime$
obtained at BESIII so far. The analyses range from detailed studies of the
common decays dynamics, observations of new radiative and Dalitz decays, and
search for rare/forbidden decays with sensitivity up to $\cal{B}\sim 10^{-5}$.
Finally, prospects of the forthcoming runs at $J/\psi$ peak for the $\eta$ and
$\eta^\prime$ physics are discussed.

29
The categories of this paper are: funct-an
37
The categories of this paper are: supr-con
3
The categories of this paper are: physics
20
The categories of this paper are: acc-phys
1
The categories of this paper are: cs
11
The categories of this paper are: hep-lat
36
The categories of this paper are: cmp-lg
27
The categories of this paper are: comp-gas
30
The categories of this paper are: q-alg
12
The categories of this paper are: nucl-th
7
The categories of this paper are: hep-th
19
The categories of this paper are: eess
28
The categories of this paper are: alg-geom
4
The categories of this paper are: cond-mat
23
The categories of this paper are: solv-int
21
The categories of this paper are: adap-org