We calculate the branching ratio of \omega \rightarrow \pi +\pi -\gamma 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 the \sigma -meson intermediate state amplitude and \omega --\rho mixing make substantial contribution to the branching ratio.
PACS numbers: 12.20.Ds, 12.40.Vv, 13.20.Jf, 13.40.Hq
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