New QED-based predictions show that e+e- → V l+ l- (V = J/ψ, ρ0, ω, φ) production rates at BESIII and Belle II are large enough to observe, with J/ψ μ+ μ- forming a significant background to J/ψ pair production.
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Vector meson production associated with a lepton pair in $e^+$ $e^-$ annihilation
New QED-based predictions show that e+e- → V l+ l- (V = J/ψ, ρ0, ω, φ) production rates at BESIII and Belle II are large enough to observe, with J/ψ μ+ μ- forming a significant background to J/ψ pair production.