2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/36926We report preliminary $R$ values for all 85 energy points scanned in the energy region of 2-5 GeV with the upgraded Beijing Spectrometer (BESII) at the Beijing Electron Positron Collider (BEPC). The typical uncertainty on the R values we measured is about 7%. The new R values have a significant impact on the predicted mass of the Higgs coming from the global fit to the electroweak data, and will also contribute to the interpretation of the E821 g-2 experiment.3 pages, 1 figure, talk given at ICHEP2000High Energy Physics - Experimenttext