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A simultaneous measurement of the QCD colour factors and the strong coupling

Bailey, Ian Richard and Kartvelishvili, Vakhtang (2001) A simultaneous measurement of the QCD colour factors and the strong coupling. European Physical Journal C: Particles and Fields, 20 (4). pp. 601-615. ISSN 1434-6044

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Abstract

Using data from e+e− annihilation into hadrons, taken with the OPAL detector at LEP at the Z pole between 1991 and 1995, we performed a simultaneous measurement of the colour factors of the underlying gauge group of the strong interaction, CF and CA, and the strong coupling, αs. The measurement was carried out by fitting next-to-leading order perturbative predictions to measured angular correlations of 4-jet events together with multi-jet related variables. Our results, CA = 3.02 ± 0.25(stat.) ± 0.49(syst.), CF = 1.34 ± 0.13(stat.) ± 0.22(syst.), αs(MZ )=0.120 ± 0.011(stat.) ± 0.020(syst.), provide a test of perturbative QCD in which the only assumptions are non-abelian gauge symmetry and standard hadronization models. The measurements are in agreement with SU(3) expectations for CF and CA and the world average of αs(MZ).

Item Type: Article
Journal or Publication Title: European Physical Journal C: Particles and Fields
Subjects:
Departments: Faculty of Science and Technology > Physics
ID Code: 82922
Deposited By: ep_importer_pure
Deposited On: 16 Nov 2016 09:50
Refereed?: Yes
Published?: Published
Last Modified: 23 Nov 2017 00:04
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/82922

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