First determination of the strong coupling constant using NNLO predictions for hadronic event shapes in e^+e^- annihilations

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dc.creatorDissertori, G.
dc.creatorRidder, A. Gehrmann-De
dc.creatorGehrmann, T.
dc.creatorGlover, E. W. N.
dc.creatorHeinrich, G.
dc.creatorStenzel, H.
dc.date2007-12-03
dc.date2008-02-11
dc.date.accessioned2026-07-07T12:22:18Z
dc.date.available2026-07-07T12:22:18Z
dc.descriptionWe 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 $e^+e^-$ annihilations 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 α_s(M_Z^2) = 0.1240+-0.0008(stat)+-0.0010(exp)+-0.0011(had)+-0.0029(theo).
dc.description25 pages, LaTeX, extended discussion of hadronization corrections, typos corrected
dc.identifierhttps://arxiv.org/abs/0712.0327
dc.identifierhttp://arxiv.org/abs/0712.0327
dc.identifierJHEP 0802:040,2008
dc.identifierdoi:10.1088/1126-6708/2008/02/040
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/213605
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectHigh Energy Physics - Experiment
dc.titleFirst determination of the strong coupling constant using NNLO predictions for hadronic event shapes in e^+e^- annihilations
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