Genuine Correlations in Hadronic Z Decays

Correlations among hadrons with the same electric charge produced in Z decays are studied using the high statistics data collected from 1991 through 1995 with the OPAL detector at LEP. Normalized factorial cumulants up to fourth order are used to measure genuine particle correlations as a function of the size of phase space domains in rapidity, azimuthal angle and transverse momentum. Some of the recently proposed algorithms to simulate Bose-Einstein effects, implemented in the Monte Carlo model Pythia, reproduce reasonably well the measured secondand higher-order correlations between particles with the same charge as well as those in all-charge particle multiplets.