Measurement of Delta++ (1232) production in hadronic Z decays

1995
A measurement of the Δ++(1232) inclusive production in hadronicdecays of the Z at LEP is presented, based on 1.3 million hadronicevents collected by the DELPHIdetector in the 1994 LEP running period. The DELPHIring imaging Cherenkov counters are used for identifying hadrons. The average Δ++(1232) multiplicity per hadronicevent is 0.079 ± 0.015 which is more than a factor of two below the JETSET, HERWIG and UCLA model predictions. It agrees with a recently proposed universal mass dependence of particle production rates in e+e− annihilations.
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