Study of the Process $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}{\pi }^{+}{\pi }^{-}$ IN THE C.M. Energy Range 920--1060 MeV with the CMD-3 Detector

A cross section of the process $e^{+}{e}^{-}\to \text{pipi}\text{pipi}$ has been measured using 6798$\pm$93 signal events from a data sample corresponding to an integrated luminosity of 9.8 pb${}^{-1}$ collected with the CMD-3 detector in the center-of-mass energy range 920–1060 MeV. The measured cross section exhibits an interference pattern of the $\varphi (1020)\to \text{pipi}\text{pipi}$ decay with a non-resonant process $e^{+}{e}^{-}\to \text{pipi}\text{pipi}$, from which we obtain the branching fraction of the doubly suppressed decays (by G-parity and OZI rule): $\text{BR}(\varphi \to \text{pipi}\text{pipi})=(6.5\pm 2.7\pm 1.6)\times {10}^{-6}$.