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- Title
Charged particle multiplicity in three-jet events and two-gluon systems.
- Authors
Abdallah, J.; Abreu, P.; Adam, W.; Adzic, P.; Albrecht, T.; Alderweireld, T.; Alemany-Fernandez, R.; Allmendinger, T.; Allport, P. P.; Amaldi, U.; Amapane, N.; Amato, S.; Anashkin, E.; Andreazza, A.; Andringa, S.; Anjos, N.; Antilogus, P.; Apel, W.-D.; Arnoud, Y.; Ask, S.
- 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 C A / C F with the result 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 $r = N_{gg}(s)/N_{q\bar q}(s)$ of the gluon and quark multiplicities and $r^{(1)} = N_{gg}'(s)/N_{q\bar q}'(s)$ 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).
- Subjects
GLUONS; HADRONS; LOGARITHMS; QUARKS; PARTICLES (Nuclear physics)
- Publication
European Physical Journal C -- Particles & Fields, 2005, Vol 44, Issue 3, p311
- ISSN
1434-6044
- Publication type
Article
- DOI
10.1140/epjc/s2005-02390-x