Chinese Acad Sci, Inst High Energy Phys, Beijing 100039, Peoples R China
The QED running coupling constant alpha(s) and the anomalous magnetic moment of muon a(mu) are two fundamental quantities for the precision test of the Standard Model (SM). The current uncertainties on alpha(s) and a(mu) are dominated by the contribution from the R-values measured about 20 years ago with an averaged uncertainty of 15% in the energy region below 5 GeV. This review article 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 Cryogenic Magnetic Detector, CMD-2 and SND (Spherical Neutral Detector) at VEEP-2M in Novosibirsk are reviewed and discussed.