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Precise determination of the strong coupling constant at NNLO in QCD from the three-jet rate in electron–positron annihilation at LEP


Dissertori, G; Gehrmann-De Ridder, A; Gehrmann, T; Glover, E W N; Heinrich, G; Stenzel, H (2010). Precise determination of the strong coupling constant at NNLO in QCD from the three-jet rate in electron–positron annihilation at LEP. Physical Review Letters, 104(7):072002.

Abstract

We present the first determination of the strong coupling constant from the three-jet rate in e+e- annihilation at LEP, based on a next-to-next-to-leading-order (NNLO) perturbative QCD prediction. More precisely, we extract αs(MZ) by fitting perturbative QCD predictions at O(αs3) to data from the ALEPH experiment at LEP. Over a large range of the jet-resolution parameter ycut, this observable is characterized by small nonperturbative corrections and an excellent stability under renormalization scale variation. We find αs(MZ)=0.1175±0.0020(expt)±0.0015(theor), which is more accurate than the values of αs(MZ) from e+e- event-shape data currently used in the world average.

Abstract

We present the first determination of the strong coupling constant from the three-jet rate in e+e- annihilation at LEP, based on a next-to-next-to-leading-order (NNLO) perturbative QCD prediction. More precisely, we extract αs(MZ) by fitting perturbative QCD predictions at O(αs3) to data from the ALEPH experiment at LEP. Over a large range of the jet-resolution parameter ycut, this observable is characterized by small nonperturbative corrections and an excellent stability under renormalization scale variation. We find αs(MZ)=0.1175±0.0020(expt)±0.0015(theor), which is more accurate than the values of αs(MZ) from e+e- event-shape data currently used in the world average.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:19 February 2010
Deposited On:05 Jan 2011 10:31
Last Modified:05 Apr 2016 14:09
Publisher:American Physical Society
ISSN:0031-9007
Publisher DOI:https://doi.org/10.1103/PhysRevLett.104.072002
Related URLs:http://arxiv.org/abs/0910.4283

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