Abstract
Using a data sample with a total integrated luminosity of 9998.3 nb −1 collected at center of mass energies of 2.6, 3.07 and 3.65 GeV with BESII, cross section for e + e − annihilation into hadronic final states ( R values) are measured with statistical errors smaller than 1% and systematic errors about 3.5%. The R values measured at center-of-mass energies between 3.7 and 5.0 GeV are fitted to determine the resonance parameters (mass, total width, electron width) of the high mass charmonia states, ψ ( 3770 ) , ψ ( 4040 ) , ψ ( 4160 ) and ψ ( 4415 ) .
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