Charged particle multiplicity in three-jet events and two-gluon systems

DELPHI Collaboration, The and Borissov, Guennadi V. and Sopczak, A. (2005) Charged particle multiplicity in three-jet events and two-gluon systems. European Physical Journal C: Particles and Fields, 44 (3). pp. 311-331. ISSN 1434-6044

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The 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 CA/CF with the result CA/CF = 2.261 ± 0.014stat. ± 0.036exp. ± 0.066theo. 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 twogluon colour-singlet states over a wide energy range. The ratios r = Ngg(s)/Nq¯q(s) of the gluon and quark multiplicities and r(1) = N gg(s)/Nq ¯q(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).

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Journal Article
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European Physical Journal C: Particles and Fields
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08 Oct 2016 00:06
Last Modified:
17 Sep 2023 00:09