Properties of Hadronization in e+e- -Annihilation

Possible effects from colour interferences in strong interactions are discussed and investigated, and possible experimental signals in e+e- --> hadrons and e+e- --> W+W- --> hadrons are suggested. The observability of the signals depend on the relative probabilities of the occurrence of interferences, and can provide a measurement of the probabilities. This is important since these probabilities cannot be calculated within perturbative QCD. Models of colour interference are implemented into existing MC programs. An investigation to which extent the spin of initial quarks in e+e- --> Z --> qqbar can be transferred to hadrons formed in the hadronization process is made, and heavy quark fragmentation within the framework of the Lund string model is discussed. A computer program to calculate group theoretical (colour) factors of QCD Feynman diagrams is presented, and the production of deuteron in Upsilon decay and in e+e- --> qqbar events is studied.