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- W2011129579 abstract "We present measurements of the branching fractions for J/ψ→e+e− and μ+μ− using 3M ψ(2S) decays collected with the CLEO detector operating at the CESR e+e− collider. We obtain B(J/ψ→e+e−)=(5.945±0.067±0.042)% and B(J/ψ→μ+μ−)=(5.960±0.065±0.050)%, leading to an average of B(J/ψ→ℓ+ℓ−)=(5.953±0.056±0.042)% and a ratio of B(J/ψ→e+e−)/B(J/ψ→μ+μ−)=(99.7±1.2±0.6)%, all consistent with, but more precise than, previous measurements.Received 11 March 2005DOI:https://doi.org/10.1103/PhysRevD.71.111103©2005 American Physical Society" @default.
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