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.

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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
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article

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

G.V. Fedotovich
1 citations
Moscow University Physics Bulletin
Particle physics theoretical and experimental studies
0.66
article

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

G.V. Fedotovich
article en
1 citations

Abstract

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.

Moscow University Physics BulletinVol. 79(S1)
Budker Institute of Nuclear Physics (RU)
Openalex Percentile: Top 13%
Particle physics theoretical and experimental studies
0.66
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