Charged Particle Multiplicity in Three-Jet Events and Two-Gluon Systems

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dc.creatorThe DELPHI Collaboration
dc.creatorAbdallah, J.
dc.date2005-10-07
dc.date.accessioned2026-07-07T11:58:10Z
dc.date.available2026-07-07T11:58:10Z
dc.descriptionThe charged particle multiplicity in hadronic three-jet events from Z decays is investigated. The topology dependence of the event multiplicity is found to be well described by a modified leading logarithmic prediction. A parameter fit of the prediction to the data yields a measurement of the colour factor ratio C_A/C_F with the result C_A/C_F = 2.261 +/- 0.014 (stat.) +/- 0.036 (exp.) +/- 0.066 (theo.) in agreement with the SU(3) expectation of QCD. The quark-related contribution to the event multiplicity is subtracted from the three-jet event multiplicity resulting in a measurement of the multiplicity of two-gluon colour-singlet states over a wide energy range. The ratios r=N_{gg}(s)/N_{q qbar}(s) of the gluon and quark multiplicities and r^{(1)}=N_{gg}'(s)/N_{q qbar}'(s) of their derivatives are compared with perturbative calculations. While a good agreement between calculations and data is observed for r^{(1)}, larger deviations are found for r indicating that non-perturbative effects are more important for r than for r^{(1)}.
dc.description37 pages, 14 figures, Accepted by Eur. Phys. J. C
dc.identifierhttps://arxiv.org/abs/hep-ex/0510025
dc.identifierhttp://arxiv.org/abs/hep-ex/0510025
dc.identifierEur.Phys.J.C44:311-331,2005
dc.identifierdoi:10.1140/epjc/s2005-02390-x
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/206132
dc.subjectHigh Energy Physics - Experiment
dc.titleCharged Particle Multiplicity in Three-Jet Events and Two-Gluon Systems
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