Study of the proccess $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}{\pi }^0{\pi }^0\eta$ in the c.m. energy range 1.6--2.0 GeV with the CMD-3 detector

Abstract

The cross section of the process $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}{\pi }^0{\pi }^0\eta$ has been measured using a data sample with the integrated luminosity of 372 pb${}^{-1}$ collected with the CMD-3 detector at the VEPP-2000 $e^{+}{e}^{-}$ collider. 6300$\pm$145 signal events have been selected in the center-of-mass energy range 1.6--2.0 GeV. The total systematic uncertainty of the cross section is about 10\%. The production dynamics is dominated by the $\omega (782){\pi }^0\eta$ final state with a possible small contribution of the $a_0(980)$ resonance in the ${\pi }^0\eta$ combination. We also observe a presence of the $\rho (770{)}^{\pm }$ resonance signal in the ${\pi }^{\pm }{\pi }^0$ invariant mass distribution.

14 pages, 10 figures