Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: VMD, chiral loops, sigma-meson, and omega-rho mixing in omega-->pi^0
  pi^0 gamma decay   In an attempt to explain the latest experimental result about the branching
ratio of $\omega\to \pi^0\pi^0\gamma$ decay we reexamine the decay mechanism of
this decay in a phenomenological framework in which the contributions of VMD,
chiral loops, $\sigma$-meson intermediate state amplitudes and the effects of
$\omega-\rho$ mixing are considered. We conclude that in order to obtain the
experimental value of the branching ratio $B(\omega\to \pi^0\pi^0\gamma)$
$\sigma$-meson amplitude which makes a substantial contribution should be
included into the reaction mechanism and the effects of $\omega-\rho$ mixing
should be taken into account. We also estimate the coupling constant
$g_{\omega\sigma\gamma}$ as $g_{\omega\sigma\gamma}=0.11$ which is much smaller
than the values suggested by light cone QCD sum rules calculations.

30
The categories of this paper are: q-alg
32
The categories of this paper are: atom-ph
35
The categories of this paper are: mtrl-th
21
The categories of this paper are: adap-org
18
The categories of this paper are: econ
36
The categories of this paper are: cmp-lg
37
The categories of this paper are: supr-con
24
The categories of this paper are: dg-ga
15
The categories of this paper are: nucl-ex
22
The categories of this paper are: chao-dyn
31
The categories of this paper are: ao-sci
27
The categories of this paper are: comp-gas
7
The categories of this paper are: hep-th
14
The categories of this paper are: math-ph
1
The categories of this paper are: cs
23
The categories of this paper are: solv-int