Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-34351
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.
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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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|Item Type:||Journal Article, refereed, original work|
|Communities & Collections:||07 Faculty of Science > Physics Institute|
|Date:||19 February 2010|
|Deposited On:||05 Jan 2011 10:31|
|Last Modified:||19 Aug 2014 13:38|
|Publisher:||American Physical Society|
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