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  • Collaboration, CMD-3; :; Ignatov, F. V; Akhmetshin, R. R; Amirkhanov, A. N; Anisenkov, A. V; Aulchenko, V. M; Bashtovoy, N. S; Berkaev, D. E; Bondar, A. E; Bragin, A. V; Eidelman, S. I; Epifanov, D. A; Epshteyn, L. B; Erofeev, A. L; Fedotovich, G. V; Gorkovenko, A. O; Grancagnolo, F. J; Grebenuk, A. A; Gribanov, S. S; Grigoriev, D. N; Ivanov, V. L; Karpov, S. V; Kasaev, A. S; Kazanin, V. F; Khazin, B. I; Kirpotin, A. N; Koop, I. A; Korobov, A. A; Kozyrev, A. N; Kozyrev, E. A; Krokovny, P. P; Kuzmenko, A. E; Kuzmin, A. S; Logashenko, I. B; Lukin, P. A; Lysenko, A. P; Mikhailov, K. Yu; Obraztsov, I. V; Okhapkin, V. S; Otboev, A. V; Perevedentsev, E. A; Pestov, Yu. N; Popov, A. S; Razuvaev, G. P; Rogovsky, Yu. A; Ruban, A. A; Ryskulov, N. M; Ryzhenenkov, A. E; Semenov, A. V; Senchenko, A. I; Shatunov, P. Yu; Shatunov, Yu. M; Shebalin, V. E; Shemyakin, D. N; Shwartz, B. A; Shwartz, D. B; Sibidanov, A. L; Solodov, E. P; Talyshev, A. A; Timoshenko, M. V; Titov, V. M; Tolmachev, S. S; Vorobiov, A. I; Zemlyansky, I. M; Zhadan, D. S; Zharinov, Yu. M; Zubakin, A. S; Yudin, Yu. V

    arXiv (Cornell University), 02/2023
    Journal Article

    Phys. Rev. D 109, 112002 (2024) The cross section of the process $e^+e^-\to\pi^+\pi^-$ has been measured in the center of mass energy range from 0.32 to 1.2 GeV with the CMD-3 detector at the electron-positron collider VEPP-2000. The measurement is based on a full dataset collected below 1 GeV during three data taking seasons, corresponding to an integrated luminosity of about 62 pb$^{-1}$. In the dominant $\rho$-resonance region, a systematic uncertainty of 0.7% has been reached. At energies around $\phi$-resonance the $\pi^+\pi^-$ production cross section was measured for the first time with high beam energy resolution. The forward-backward charge asymmetry in the $\pi^+\pi^-$ production has also been measured. It shows a strong deviation from the theoretical prediction based on the conventional scalar quantum electrodynamics framework, and it is in good agreement with the generalized vector-meson-dominance and dispersive-based predictions. The impact of the presented results on the evaluation of the hadronic contribution to the anomalous magnetic moment of muon is discussed.