Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Scalar sigma meson effects in radiative rho^0-meson decays   We study the radiative $\rho^0\to \pi^+\pi^-\gamma$ and $\rho^0\to
\pi^0\pi^0\gamma$ decays and we calculate their branching ratios using a
phenomenological approach by adding to the amplitude calculated within the
framework of chiral perturbation theory and vector meson dominance the
amplitude of $\sigma$-meson intermediate state. Our results for the branching
ratios are in good agreement with the experimental values.

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The categories of this paper are: chao-dyn
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The categories of this paper are: nlin
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The categories of this paper are: physics
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The categories of this paper are: econ
7
The categories of this paper are: hep-th
5
The categories of this paper are: gr-qc
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The categories of this paper are: chem-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: alg-geom
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The categories of this paper are: quant-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: solv-int
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The categories of this paper are: cond-mat
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The categories of this paper are: atom-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: eess