Study of the process $e^+e^-\to 3(π^+π^-)π^0$ in the C.M. Energy range 1.6--2.0 GeV with the CMD-3 detector

Abstract

The cross section of the process $e^+e^- \to 3(π^+π^-)π^0$ has been measured for the first time using a data sample of 56.7 pb$^{-1}$ collected with the CMD-3 detector at the VEPP-2000 $e^+e^-$ collider. 632$\pm$32 signal events have been selected in the center-of-mass energy range 1.6 -- 2.0 GeV. A study of dynamics of seven-pion production allows one to extract contributions of the dominated $2(π^+π^-)ω$ and $2(π^+π^-)η$ intermediate states.

13 pages, 5 figures