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Coherent soft particle production in Z decays into three jets

DELPHI Collaboration, The and Borissov, Guennadi V. and Sopczak, Andre (2005) Coherent soft particle production in Z decays into three jets. Physics Letters B, 605 (1-2). pp. 37-48. ISSN 0370-2693

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Abstract

Low-energy particle production perpendicular to the event plane in three-jet events produced in Z decays in e+e− annihilation is measured and compared to that perpendicular to the event axis in two-jet events. The topology dependence of the hadron production ratio is found to agree with a leading-order QCD prediction. This agreement and especially the need for the presence of a destructive interference term gives evidence for the coherent nature of gluon radiation. Hadron production in three-jet events is found to be directly proportional to a single topological scale function of the inter-jet angles. The slope of the dependence of the multiplicity with respect to the topological scale was measured to be 2.211±0.014(stat.)±0.053(syst.) in good agreement with the expectation given by the colour-factor ratio CA/CF=9/4. This result strongly supports the assumption of local parton–hadron duality, LPHD, at low hadron momentum.

Item Type: Article
Journal or Publication Title: Physics Letters B
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: 10046
Deposited By: Ms Margaret Calder
Deposited On: 27 Jun 2008 16:21
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 14:42
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/10046

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