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J/ψ mesons have been reconstructed from their decay to μ + μ - and e + e - , using the data collected by the DELPHI experiment during 1991 and 1992 at the LEP collider. From about 1 million hadronic Z decays 153 ± 17 J/ψ were found, 5.4 ± 2.3 ψ were obtained in the channel J/ψ (→ μ + μ - )π + π - and 6.4 ± 2.7 χ c in the channel...
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