Measurement of Gamma_ee(J/psi), Gamma_tot(J/psi), and Gamma_ee[psi(2S)]/Gamma_ee(J/psi)

Abstract

Using data acquired with the CLEO detector at the CESR e+e- collider at sqrt{s} = 3.773 GeV, we measure the cross section for the radiative return process 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, in which the errors are statistical and systematic, respectively. We also determine the ratio Gamma_ee[psi(2S)] / Gamma_ee(J/psi) = 0.45 +- 0.01 +- 0.02.

12 pages postscript,also available through http://www.lns.cornell.edu/public/CLNS/2005/

References in corpus (9)

• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• The Upsilon spectrum and m_b from full lattice QCD
• Precision Measurements of the Timelike Electromagnetic Form Factors of Pion, Kaon, and Proton
• The Cleo Rich Detector
• Decay of the psi(3770) to Light Hadrons
• J/psi production via initial state radiation in e+ e- --> mu+ mu- gamma at an e+e- center-of-mass energy near 10.6 GeV
• Branching Fractions for psi(2S) to J/psi Transitions
• Observation of 1^-0^- Final States from psi(2S) Decays and e^+e^- Annihilation
• Measurement of the Branching Fractions for J/psi to ell^+ ell^-

Cited by in corpus (9)

• Heavy quarkonium: progress, puzzles, and opportunities
• Quarkonia and their transitions
• Hadron Production via e+e- Collisions with Initial State Radiation
• Measurement of the Total Hadronic Cross Section in e+e- Annihilations below 10.56 GeV
• Measurement of Γ_{ee}(J/ψ)*Br(J/ψ->e^+e^-) and Γ_{ee}(J/ψ)*Br(J/ψ->μ^+μ^-)
• Evidence for $e^{+}{e}^{-}\to \gamma {\eta }_c(1S)$ at center-of-mass energies between 4.01 and 4.60 GeV
• Masses of the η_c(nS) and η_b(nS) mesons
• How Viable Is a QCD Axion near 10 MeV?
• Analytical Forms for Cross Sections of Di-lepton Production from $e^{+}{e}^{-}$ Collisions around the $J/\psi$ Resonance