Multiplicity distributions of gluon and quark jets and tests of QCD analytic predictions

Details Multiplicity distributions of gluon and quark jets and tests of QCD analytic predictions Multiplicity distributions of gluon and quark jets and tests of QCD analytic predictions

1997-08-19

arxiv.org/abs/hep-ex/9708029v1

Eur.Phys.J.C1:479-494,1998

Physics

High Energy Physics

High Energy Physics - Experiment

32 pages, LaTeX, uses a4p.sty, 9 eps figures included (plus in colour), submitted to Zeit. Phys. C

Scientific paper

10.1007/s100520050097

Gluon jets are identified in e+e- hadronic annihilation events by tagging two quark jets in the same hemisphere of an event. The gluon jet is defined inclusively as all the particles in the opposite hemisphere. Gluon jets defined in this manner have a close correspondence to gluon jets as they are defined for analytic calculations, and are almost independent of a jet finding algorithm. The charged particle multiplicity distribution of the gluon jets is presented, and is analyzed for its mean, dispersion, skew, and curtosis values, and for its factorial and cumulant moments. The results are compared to the analogous results found for a sample of light quark (uds) jets, also defined inclusively. We observe differences between the mean, skew and curtosis values of gluon and quark jets, but not between their dispersions. The cumulant moment results are compared to the predictions of QCD analytic calculations. A calculation which includes next-to-next-to-leading order corrections and energy conservation is observed to provide a much improved description of the data compared to a next-to-leading order calculation without energy conservation. There is agreement between the data and calculations for the ratios of the cumulant moments between gluon and quark jets.

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