MULTIPLICITY DISTRIBUTIONS OF GLUON AND QUARK JETS AND TESTS OF QCD ANALYTIC PREDICTIONS

Gluon jets are identified in e(+)e(-) hadronic annihilation events by tagging two quark jets in tile same hemisphere of an event. The gluon jet is defined inclusively ns all tile particles in the opposite hemis phere. Gluon jets defined in this manlier hale a close correspondence to gluon jets as they are defined for analytic calculations, and are a lmost independent of a:let finding algorithm. The charged particle mul tiplicity distribution of the gluon jets is presented, and is analyzed for its mean. dispersion, skew, and curtosis values, and for it facto rial and cumulant moments. The results are compared to the analogous r esults found for a sample of light quark (uds) jets, also defined incl usively. We observe differences between the mean: skew and curtosis va lues of gluon and quark jets, but not between their dispersions. The c umulant moment results are compared to the predictions of QCD analytic calculations, A calculation which includes next-to-next-to-leading or der corrections and energy conservation is observed to provide a much improved description of the data compared to a next-to-leading order c alculation without energy conservation. There is agreement between the data and calculation for tile ratios of tile cumulant moments between gluon and quark jets.