Measurement of the $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}$ process cross section with the SND detector at the VEPP-2000 collider in the energy region $0.525<\sqrt{s}<0.883$ GeV

The cross section of the process $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}$ has been measured in the Spherical Neutral Detector (SND) experiment at the VEPP-2000 $e^{+}{e}^{-}$ collider VEPP-2000 in the energy region $525<\sqrt[]{s}<883$ MeV. The measurement is based on data with an integrated luminosity of about 4.6 pb${}^{-1}$. The systematic uncertainty of the cross section determination is 0.8 % at $\sqrt{s}>0.600$ GeV. The $\rho$ meson parameters are obtained as $m_\rho = 775.3\pm 0.5\pm 0.6$MeV,$\Gamma_\rho = 145.6\pm 0.6\pm 0.8$MeV,$B_{\rho\to e^+ e^-}\times B_{\rho\to\pi^+\pi^-} = (4.89\pm 0.02\pm 0.04)\times 10^{-5}$,andtheparametersofthe$e^+ e^-\to\omega\to\pi^+\pi^-$ process, suppressed by $G$-parity, as $B_{\omega\to e^+ e^-}\times B_{\omega\to\pi^+\pi^-}= (1.32\pm 0.06\pm 0.02)\times 10^{-6} $and$\phi_{\rho\omega} = 110.7\pm 1.5\pm1.0$ degrees.