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Title
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Coherent soft particle production in Z decays into three jets
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Author
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Institution/Organisation
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DELPHI Collaboration
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Abstract
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| 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 partonhadron duality, LPHD, at low hadron momentum. |
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Language
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English
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Source (journal)
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Physics letters : B. - Amsterdam, 1967, currens
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Publication
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Amsterdam
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North-Holland
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2005
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ISSN
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0370-2693
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DOI
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10.1016/J.PHYSLETB.2004.10.059
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Volume/pages
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605
:1/2
(2005)
, p. 37-48
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ISI
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000226217900005
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Full text (Publisher's DOI)
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