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Using data acquired with the CLEO detector at the CESR e+e- collider atsqrt{s} = 3.773 GeV, we measure the cross section for the radiative returnprocess e+e- --> gamma J/psi, J/psi --> mu+mu-, resulting in B(J/psi -->mu+mu-) x Gamma_ee(J/psi) = 0.3384 +- 0.0058 +- 0.0071 keV, Gamma_ee(J/psi) =5.68 +- 0.11 +- 0.13 keV, and Gamma_tot(J/psi) = 95.5 +- 2.4 +- 2.4 keV, inwhich the errors are statistical and systematic, respectively. We alsodetermine the ratio Gamma_ee[psi(2S)] / Gamma_ee(J/psi) = 0.45 +- 0.01 +- 0.02.

physical review. d. particles, fields, gravitation, and cosmology/physical review. d, particles, fields, gravitation, and cosmology

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Measurement ofΓee(J/ψ),Γtot(J