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Measurements of the strong coupling constant and the QCD color factors using four jet observables from hadronic Z decays.

Schael, S. and Bouhova-Thacker, E. V. and Bowdery, C. K. and Finch, A. J. and Hughes, Gareth and Jones, Roger W. L. and Smizanska, Maria and ALEPH Collaboration, The (2003) Measurements of the strong coupling constant and the QCD color factors using four jet observables from hadronic Z decays. European Physical Journal C: Particles and Fields, 27 (1). pp. 1-17. ISSN 1434-6044

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Abstract

Data from annihilation into hadrons, taken with the ALEPH detector at the Z resonance, are analyzed. The four-jet rate is studied as a function of the resolution parameter and compared to next-to-leading order calculations combined with resummation of large logarithms. Angular correlations in four-jet events are measured and compared to next-to-leading order QCD predictions. With these observables two different measurements are performed. In a first analysis the strong coupling constant is measured from the four-jet rate yielding . In a second measurement the strong coupling constant and the QCD colour factors are determined simultaneously from a fit to the four-jet rate and the four-jet angular correlations, giving in good agreement with the expectation from QCD.

Item Type: Article
Journal or Publication Title: European Physical Journal C: Particles and Fields
Subjects: Q Science > QC Physics
Departments: Faculty of Science and Technology > Physics
ID Code: 26334
Deposited By: Dr Maria Smizanska
Deposited On: 01 May 2009 15:10
Refereed?: Yes
Published?: Published
Last Modified: 09 Apr 2014 20:29
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/26334

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