Multiplicities and Fragmentation Functions with OPAL at LEP

摘要

Two measurements of propertied of 7." decays into hadronn arc presented. The first one 18 the charged particle hemisphere multiplicity in Z" decays to light, (up, down and strange), charm ami bottom quarks, Based on high statistics Hampton of tagged '/" decayn into heavy quarks using exclusively reconstructed D* decays or secondary vertices precise measurements are obtained. The second one is a measurement of the transverse, longitudinal and asymmetric fragmentation functions for the process c+e? --> charged hudroiw -)?X. Distributions of polar production angles of charged liadronH are analysed in bins of the energy fraction *e ~ ^iiKdroii/^iwwii' Integration of the fragmentation functions yields a precise measurement of the average charged particle multiplicity. Results are compared to predictions whore possible.