Measurement of the pion formfactor with CMD-3 detector and its implication to the hadronic contribution to muon (g-2)

Abstract

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 an integrated luminosity of about 88 pb$^{-1}$ out of which 62 pb$^{-1}$ constitutes a full dataset collected by CMD-3 at center-of-mass energies below 1 GeV. In the dominant region near $\rho$-resonance a systematic uncertainty of 0.7% has been reached. The impact of presented results on the evaluation of the hadronic contribution to the anomalous magnetic moment of muon is discussed.Comment: 6 pages, 3 figure