Comparison of four- and five-jet observables from $Z^{0}$ decays at LEP with leading order matrix-element calculations

Angular correlations in four-jet events from hadronic decays of the Z /sup 0/ have been compared with second-order matrix element calculations. Five-jet events have arise been investigated. Their production rate and their angular correlations were compared with third order matrix element calculations. Both the results of the four-jet and the five-jet measurements are consistent with a proportion of five-jet events in the data that is several times larger than the leading order prediction. (12 refs).