Measurement of e+e- -> pi+pi- cross section with CMD-2 around rho-meson
CMD-2 collaboration
TL;DR
This paper reports a precise measurement of the e+e- -> pi+pi- cross section around the rho-meson resonance, providing valuable data for understanding hadronic effects in muon magnetic moment calculations.
Contribution
The study presents a high-precision measurement of the pion form factor in the 0.61 to 0.96 GeV range with 0.6% systematic uncertainty, improving existing data.
Findings
Measured cross section with high precision
Determined pion form factor with 0.6% systematic error
Discussed implications for muon g-2 calculations
Abstract
The cross section of the process e+e- -> pi+pi- has been measured using about 114000 events collected by the CMD-2 detector at the VEPP-2M e+e- collider in the center-of-mass energy range from 0.61 to 0.96 GeV. Results of the pion form factor determination with a 0.6% systematic uncertainty are presented. Implications for the hadronic contribution to the muon anomalous magnetic moment are discussed.
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