Measurement of the $$\boldsymbol{e}^{\boldsymbol{+}}\boldsymbol{e}^{\boldsymbol{-}}\boldsymbol{\to}{\pi}^{\boldsymbol{+}}{\pi}^{\mathbf{-}}$$ Cross Section below 1.2 GeV with the CMD-3 Detector at VEPP-2000 Collider
The cross section of the reaction $$e^{+}e^{-}\to\pi^{+}\pi^{-}$$ was 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 analyses of the collected data based on the integrated luminosity of about 62 $$\textrm{pb}^{-1}$$ . The systematic uncertainty of about 0.7 $$\%$$ has been reached around $$\rho$$ -resonance. The forward-backward charge asymmetry for the channel $$\pi^{+}\pi^{-}$$ has also been measured. It clear demonstrates the strong deviation from the conventional scalar QED prediction, but it well agrees with [1]. The current results for pion form factor were used to evaluate the hadronic contribution to the anomalous magnetic moment of muon and reveal a discrepancy with the results of previous experiments.
Authors
- G.V. Fedotovich (ORCID: https://orcid.org/0000-0002-5369-1947)
Institutions
- Budker Institute of Nuclear Physics (RU)
Publication Details
- Journal
- Moscow University Physics Bulletin
- Published
- 2024-12-01
- DOI
- https://doi.org/10.3103/s0027134924700838
- Citations
- 1
- Primary Topic
- Particle physics theoretical and experimental studies
- Type
- article
- Field-Weighted Citation Impact
- 0.66