Chiral loop and LsigmaM predictions for phi->pi0etagamma

Abstract

A prediction for the contributions of chiral loops and the L$\ddot{I}ƒ$M model to the radiative $\ddot{I}•\to \ddot{I}{€}^0\hat{I}\cdot {\hat{I}}^3$ decay mode is presented. The L$\ddot{I}ƒ$M is used as an appropriate framework for describing the pole effects of the $a_0(980)$ scalar resonance. As a result, a better agreement with present available data is achieved for the higher part of the $\ddot{I}{€}^0\hat{I}\cdot$ invariant mass spectrum. For the branching ratio, a value of $B(\ddot{I}•\to \ddot{I}{€}^0\hat{I}\cdot {\hat{I}}^3)=(0.75$--$0.95)\times 10^{-4}$ is found.

10 pages, 2 figures. Talk given at the Hadron Structure'2000 Conference, Stara Lesna, High Tatras Mountains, Slovakia, 2-7 October 2000