Scalar $a_0(980)$ meson in $\varphi \to {\pi }^0\eta \gamma$ decay

Abstract

We study the radiative decay $\varphi \to {\pi }^0\eta \gamma$ 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 $\varphi \to {\pi }^0\eta \gamma$ decay we estimate the branching ratio of $\varphi \to a_0\gamma$ decay.

Comments: 18 pages, RevTeX, 6 PS figures. A rounding-off error in printing the horizontal axes of figures resulting from the computer program Grapher is corrected. Journal Ref.: J. Phys. G: Nucl. Part. Phys. 28 (2002) 2783-2793