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A combination by the LEP QCD working group of alpha-s values derived from event shape variables at LEP : a contribution to the 10th high-energy international conference on quantum chromodynamics held in Montpellier, France in July 2003.

Jones, Roger W. L. (2004) A combination by the LEP QCD working group of alpha-s values derived from event shape variables at LEP : a contribution to the 10th high-energy international conference on quantum chromodynamics held in Montpellier, France in July 2003. Nuclear Physics B - Proceedings Supplements, 133 (1). pp. 13-20. ISSN 0920-5632

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Abstract

The LEP QCD Working Group has produced a combination of αs values derived from event-shape distributions. The distributions are measured at scales below the mass of the Z boson up to 206 GeV. Values of αs are all extracted using the consistent application of O(αs2)+ NLLA predictions with the modified Log(R) matching scheme. A combined αs is obtained for each experiment and observable using at least two experiments in each case for energies above at ad above the mass of the Z boson. A consistent treatment and controlled breakdown is made of the sources of uncertainty on the input values. The combined best value for αs(MZ) = 0.11 ± 0.003 ± 0.003. The dominant uncertainty is theoretical, due to the effects of missing higher order contributions.

Item Type: Article
Journal or Publication Title: Nuclear Physics B - Proceedings Supplements
Subjects: Q Science > QC Physics
Departments: Faculty of Science and Technology > Physics
ID Code: 23996
Deposited By: ep_ss_importer
Deposited On: 25 Feb 2009 13:17
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 16:19
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/23996

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