R-values in Low Energy e^+e^- Annihilation
Z. G. Zhao
TL;DR
This paper reviews recent experimental measurements of R-values in low energy electron-positron annihilation, highlighting efforts to improve precision using upgraded detectors at Beijing and Novosibirsk colliders.
Contribution
It summarizes new experimental results of R-values with reduced uncertainties from BESII, CMD-2, and SND detectors.
Findings
Improved precision in R-value measurements at low energies.
Successful use of upgraded detectors to reduce uncertainties.
Comparison of results from different experimental setups.
Abstract
This presentation briefly summarizes the recent measurements of R-values in low energy e^+e^- annihilation. The new experiments aimed at reducing the uncertainties in R-values and performed with the upgraded Beijing Spectrometer (BESII) at Beijing Electron Positron Collider (BEPC) in Beijing and with CMD-2 and SND at VEEP-2M in Novosibirsk are reviewed and discussed.
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