Investigation of the $e^{+}{e}^{-}\to \omega {\pi }^0\to {\pi }^0{\pi }^0\gamma$ reaction in the energy domain near the $\varphi$-meson

Abstract

The $e^{+}{e}^{-}\to \omega {\pi }^0\to {\pi }^0{\pi }^0\gamma$ process was investigated in the SND experiment at the VEPP-2M collider. A narrow energy interval near the $\varphi$-meson was scanned. The observed cross-section reveals, at the level of three standard deviation, the interference effect caused by $\varphi \to {\pi }^0{\pi }^0\gamma$ decay. The cross-section parameters, as well as the real and imaginary parts of the $\varphi$-meson related amplitude, were measured.

Comments: 34 pages, 7 figures, LaTeX, uses FEYNMAN package. Erroneously reported C_{12} coefficient corrected (an error discovered in hep-ph/0603241). in the published version Nucl. Phys. B569(2000), 158 this coefficient is reported incorrectly