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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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Abstract

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).

Item Type: Article
Journal or Publication Title: European Physical Journal C: Particles and Fields
Additional Information: Author list is partial - see original article for full author list.
Subjects: Q Science > QC Physics
Departments: Faculty of Science and Technology > Physics
ID Code: 10045
Deposited By: Ms Margaret Calder
Deposited On: 27 Jun 2008 16:04
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 14:42
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/10045

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