A Measurement of Psi(2S) Resonance Parameters

Cross sections for e+e- to hadons, pi+pi- J/Psi, and mu+mu- have been measured in the vicinity of the Psi(2S) resonance using the BESII detector operated at the BEPC. The Psi(2S) total width; partial widths to hadrons, pi+pi- J/Psi, muons; and corresponding branching fractions have been determined to be Gamma(total)= (264±27) keV; Gamma(hadron)= (258±26) keV, Gamma(mu)= (2.44±0.21) keV, and Gamma(pi+pi- J/Psi)= (85±8.7) keV; and Br(hadron)= (97.79±0.15)%, Br(pi+pi- J/Psi)= (32±1.4)%, Br(mu)= (0.93±0.08)%, respectively.