The decay $\rho^{0}\to \pi^{0}\pi^{0}\gamma$ and the role of   $\sigma$-meson
  We study the radiative decay $\rho^{0}\to\pi^{0}\pi^{0}\gamma$ within the framework of a phenomenological approach in which the contributions of $\sigma$-meson and $\omega$-meson intermediate states and of the pion-loops are considered. We conclude that the $\sigma$-meson amplitude provides the dominant contribution. 
A. Gokalp and O. Yilmaz (Physics Department, Middle East Technical   University, Turkey)