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A sample of events enriched in bb quark pairs was selected in the data recorded by the DELPHI experiment at LEP during 1992 and 1993, by the presence of secondary decay vertices from short-lived particles. Using this sample, the average multiplicities of K 0s , K ± , p(p), Λ and of charged particles in bb events have been measured, distinguishing the component from fragmentation...
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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