Measurement of the Total Cross Section for Hadronic Production by e+e- Annihilation at Energies between 2.6-5 Gev
Abstract
Description
Using the upgraded Beijing Spectrometer (BESII), we have measured the total cross section for $e^+e^-$ annihilation into hadronic final states at center-of-mass energies of 2.6, 3.2, 3.4, 3.55, 4.6 and 5.0 GeV. Values of $R$, $σ(e^+e^-\to {hadrons})/σ(e^+e^-\toμ^+μ^-)$, are determined.
Submitted to Phys. Rev. Lett
Submitted to Phys. Rev. Lett