Journal
JOURNAL OF HIGH ENERGY PHYSICS
Volume -, Issue 2, Pages -Publisher
SPRINGER
DOI: 10.1088/1126-6708/2008/02/040
Keywords
LEP HERA and SLC physics; NLO computations; jets; QCD
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Funding
- Science and Technology Facilities Council [PP/D00621X/2] Funding Source: researchfish
- STFC [PP/D00621X/2, ST/G000522/1] Funding Source: UKRI
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We present the first determination of the strong coupling constant from a fit of next-to-next-to-leading order QCD predictions to event-shape variables, measured in e(+)e(-) eannihilations at LEP. The data have been collected by the ALEPH detector at centre-of-mass energies between 91 and 206 GeV. Compared to results of next-to-leading order fits we observe that the central fit values are lower by about 10%, with considerably reduced scatter among the results obtained with different event-shape variables. The dominant systematic uncertainty from renormalization scale variations is reduced by a factor of two. By combining the results for several event-shape variables and centre-of-mass energies, we find
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