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Coherent soft particle production in Z decays into three jets

Research output: Contribution to journalJournal article


<mark>Journal publication date</mark>6/01/2005
<mark>Journal</mark>Physics Letters B
Issue number1-2
Number of pages12
Pages (from-to)37-48
<mark>Original language</mark>English


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.

Bibliographic note

Author list is partial - see original article for full author list.