Experimental study of the e^+e^-\toπ^+π^-π^0 reaction by SND detector in the energy range sqrt{s}=0.42--1.38 GeV

Abstract

The review of the SND results of the $e^{+}{e}^{-}\to \ddot{I}{€}^{+}\ddot{I}{€}^{-}\ddot{I}{€}^0$ process study in the energy range $\sqrt[]{s}=0.42$ -- 1.38 GeV at VEPP-2M collider, based on about $2\times 10^6$ selected events, is presented. The total cross section, parameters of the $\ddot{I}$, $\ddot{I}‰$, $\ddot{I}•$ resonances, and $\ddot{I}{‰}^{\prime }$, $\ddot{I}{‰}^{\prime \prime }$ states were obtained. It was found that $\ddot{I}\ddot{I}€$ and $\ddot{I}‰\ddot{I}{€}^0$ intermediate states describe the reaction dynamics. The experimental data cannot be described by a sum of only $\ddot{I}‰$, $\ddot{I}•$, $\ddot{I}{‰}^{\prime }$ and $\ddot{I}{‰}^{\prime \prime }$ resonances contributions. This can be interpreted as a manifestation of the $\ddot{I}\to 3\ddot{I}€$ decay, suppressed by $G$-parity, with relative probability $B(\ddot{I}\to 3\ddot{I}€)=(1.01{\pm }_{0.36}^{0.54}\pm 0.034)\times 10^{-4}$.

6 pages and 2 figures. Talk given at the X International Conference on Hadron Spectroskopy, Aschaffenburg, Germany, August 31 - September 6, 2003