Experimental properties of gluon and quark jets from a point source

Details Experimental properties of gluon and quark jets from a point source Experimental properties of gluon and quark jets from a point source

1999-03-15

arxiv.org/abs/hep-ex/9903027v1

Eur.Phys.J.C11:217-238,1999

Physics

High Energy Physics

High Energy Physics - Experiment

44 pages, LaTeX, including 15 eps figures, submitted to European Physical Journal C

Scientific paper

10.1007/s100520050628

Gluon jets are identified in hadronic Z0 decays as all the particles in a hemisphere opposite to a hemisphere containing two tagged quark jets. Gluon jets defined in this manner are equivalent to gluon jets produced from a color singlet point source and thus correspond to the definition employed for most theoretical calculations. In a separate stage of the analysis, we select quark jets in a manner to correspond to calculations, as the particles in hemispheres of flavor tagged light quark (uds) events. We present the distributions of rapidity, scaled energy, the logarithm of the momentum, and transverse momentum with respect to the jet axes, for charged particles in these gluon and quark jets. We also examine the charged particle multiplicity distributions of the jets in restricted intervals of rapidity. For soft particles at large transverse momentum, we observe the charged particle multiplicity ratio of gluon to quark jets to be 2.29 +- 0.09 +- 0.15 in agreement with the prediction that this ratio should approximately equal the ratio of QCD color factors, CA/CF = 2.25. The intervals used to define soft particles and large transverse momentum for this result, p<4 GeV/c and 0.8

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