Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The $\phi\to\eta\pi^0\gamma$ decay   Rare radiative decay $\phi\to\eta\pi^0\gamma$ was studied with SND detector
at {VEPP-2M} electron-positron collider and its branching ratio was measured:
$B(\phi\to\eta\pi^0\gamma)=(0.88\pm0.14\pm0.09)\cdot 10^{-4}$. Significant
contribution of the $a_0(980)\gamma$ intermediate state was observed in the
decay. The result is based on total integrated luminosity corresponding to
$2\cdot10^7$ produced $\phi$ mesons.

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The categories of this paper are: q-bio
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The categories of this paper are: dg-ga
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The categories of this paper are: hep-ph
17
The categories of this paper are: q-fin
36
The categories of this paper are: cmp-lg
32
The categories of this paper are: atom-ph
37
The categories of this paper are: supr-con
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The categories of this paper are: cond-mat
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The categories of this paper are: quant-ph
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The categories of this paper are: nlin
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The categories of this paper are: alg-geom
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The categories of this paper are: comp-gas
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The categories of this paper are: funct-an
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The categories of this paper are: astro-ph
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The categories of this paper are: solv-int
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The categories of this paper are: adap-org