Measurement of the Pion Form Factor with CMD-3 Detector and Its Implication to the Hadronic Contribution to Muon (<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>g</mml:mi><mml:mo>−</mml:mo><mml:mn>2</mml:mn></mml:mrow></mml:math>)
F.V. Ignatov, R.R. Akhmetshin, A. N. Amirkhanov, A. V. Anisenkov, V.M. Aulchenko, N.S. Bashtovoy, D. E. Berkaev, A. E. Bondar, A. V. Bragin, S.I. Eidelman, D. A. Epifanov, L.B. Epshteyn, A. L. Erofeev, G.V. Fedotovich, A. O. Gorkovenko, F. J. Grancagnolo, A. A. Grebenuk, S.S. Gribanov, D. N. Grigoriev, V. L. Ivanov, S. V. Karpov, A. S. Kasaev, V. F. Kazanin, B.I. Khazin, A. N. Kirpotin, I. A. Koop, A. A. Korobov, A. N. Kozyrev, E. A. Kozyrev, P. Krokovny, A.E. Kuzmenko, A. Kuzmin, I.B. Logashenko, P.A. Lukin, А. П. Лысенко, K. Mikhailov, И. В. Образцов, V. S. Okhapkin, A.V. Otboev, E. A. Perevedentsev, Yu.N. Pestov, A. S. Popov, G. P. Razuvaev, Yu. A. Rogovsky, A. A. Ruban, N.M. Ryskulov, A.E. Ryzhenenkov, A. Semenov, A. I. Senchenko, P. Yu. Shatunov, Yu. M. Shatunov, V. Shebalin, D.N. Shemyakin, B. A. Shwartz, D. B. Shwartz, A.L. Sibidanov, E. P. Solodov, A. A. Talyshev, M. V. Timoshenko, В.М. Титов, S. S. Tolmachev, A.I. Vorobiov, Yu. V. Yudin, I. M. Zemlyansky, D. S. Zhadan, Yu. M. Zharinov, A. S. Zubakin
Abstract
The cross section of the process e^{+}e^{-}→π^{+}π^{-} 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 an integrated luminosity of about 88 pb^{-1}, of which 62 pb^{-1} represent a complete dataset collected by CMD-3 at center-of-mass energies below 1 GeV. In the dominant region near the ρ resonance a systematic uncertainty of 0.7% was achieved. The implications of the presented results for the evaluation of the hadronic contribution to the anomalous magnetic moment of the muon are discussed.