2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/178643We report values of $R = σ(e^+e^-\to {hadrons})/σ(e^+e^-\toμ^+μ^-)$ for 85 center-of-mass energies between 2 and 5 GeV measured with the upgraded Beijing Spectrometer at the Beijing Electron-Positron Collider.5 pages, 3 figuresHigh Energy Physics - ExperimentMeasurements of the Cross Section for e+e- -> hadrons at Center-of-Mass Energies from 2 to 5 GeVtext