Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measurement of the Matrix Elements for the Decays $\eta \rightarrow
  \pi^{+}\pi^{-}\pi^0$ and $\eta/\eta^{\prime}\rightarrow\pi^0\pi^0\pi^0$   Based on a sample of $1.31 \times 10^9$ $J/\psi$ events collected with the
BESIII detector at the BEPCII collider, Dalitz plot analyses of selected 79,625
$\eta\rightarrow\pi^{+}\pi^{-}\pi^0$ events, 33,908
$\eta\rightarrow\pi^0\pi^0\pi^0$ events and 1,888
$\eta^{\prime}\rightarrow\pi^0\pi^0\pi^0$ events are performed. The measured
matrix elements of $\eta\rightarrow\pi^+\pi^-\pi^0$ are in reasonable agreement
with previous measurements. The Dalitz plot slope parameters of
$\eta\rightarrow\pi^0\pi^0\pi^0$ and $\eta^{\prime}\rightarrow\pi^0\pi^0\pi^0$
are determined to be $-0.055 \pm 0.014 \pm 0.004$ and $-0.640 \pm 0.046 \pm
0.047$, respectively, where the first uncertainties are statistical and the
second systematic. Both values are consistent with previous measurements, while
the precision of the latter one is improved by a factor of three. Final state
interactions are found to have an important role in those decays.

18
The categories of this paper are: econ
1
The categories of this paper are: cs
9
The categories of this paper are: nlin
16
The categories of this paper are: stat
33
The categories of this paper are: plasm-ph
32
The categories of this paper are: atom-ph
27
The categories of this paper are: comp-gas
13
The categories of this paper are: quant-ph
2
The categories of this paper are: math
17
The categories of this paper are: q-fin
0
The categories of this paper are: hep-ph
10
The categories of this paper are: q-bio
25
The categories of this paper are: patt-sol
11
The categories of this paper are: hep-lat
21
The categories of this paper are: adap-org
23
The categories of this paper are: solv-int