Scalar $a_0(980)$ meson in $\phi\to \pi^{0}\eta\gamma$ decay
  We study the radiative decay $\phi\to\pi^{0}\eta\gamma$ within the framework of a phenomenological approach in which the contributions of $\rho$-meson, chiral loop and $a_0$-meson are considered. We analyze the interference effects between different contributions and utilizing the experimental branching ratio and invariant $\pi^0\eta$ mass spectrum for $\phi\to\pi^{0}\eta\gamma$ decay we estimate the branching ratio of $\phi\to a_0\gamma$ decay. 
A. Gokalp, A. Kucukarslan, S. Solmaz, O. Yilmaz (Middle East Technical   University, Ankara-Turkey)