Measurement of J/ψ Resonance Parameters

  • The cross sections of e+e→hadrons,e+e+μhave been measured in the vicinity of J/ψresonance at BES/BEPC.The fit of the observed cross sections gives the new results of J/ψ resonance parameters:the partial widths to hadrons,electrons and muous are Γh=74.1±8.1keV,Γe= 5.14±0.39keV and Γμ=5.13±0.52keV respectively;the total width Γ=84.4±8.9keV;the branching fractions Γh/Γ=(87.8±0.5)%,Γe/Γ=(6.09± 0.33)%,and Γμ/Γ=(6.08±0.33) %.
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BES Collaboration. Measurement of J/ψ Resonance Parameters[J]. Chinese Physics C, 1995, 19(8): 673-685.
BES Collaboration. Measurement of J/ψ Resonance Parameters[J]. Chinese Physics C, 1995, 19(8): 673-685. shu
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Received: 1900-01-01
Revised: 1900-01-01
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Measurement of J/ψ Resonance Parameters

  • Institute of High Energy Physics,The Chinese Academy of Sciences,Beijing 100039

Abstract: The cross sections of e+e→hadrons,e+e+μhave been measured in the vicinity of J/ψresonance at BES/BEPC.The fit of the observed cross sections gives the new results of J/ψ resonance parameters:the partial widths to hadrons,electrons and muous are Γh=74.1±8.1keV,Γe= 5.14±0.39keV and Γμ=5.13±0.52keV respectively;the total width Γ=84.4±8.9keV;the branching fractions Γh/Γ=(87.8±0.5)%,Γe/Γ=(6.09± 0.33)%,and Γμ/Γ=(6.08±0.33) %.

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