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

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arxiv 0712.0327 v2 pith:4Q2RKEZF submitted 2007-12-03 hep-ph hep-ex

G. Dissertori , A. Gehrmann-De Ridder , T. Gehrmann , E.W.N. Glover , G. Heinrich , H. Stenzel This is my paper · ORCID
classification hep-phhep-ex
keywords event-shaperesultsvariablesannihilationscentre-of-massconstantcouplingdetermination
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abstract

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 $e^+e^-$ 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 \alpha_s(M_Z^2) = 0.1240+-0.0008(stat)+-0.0010(exp)+-0.0011(had)+-0.0029(theo).

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Cited by 2 Pith papers

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  1. Precise Determination of the Strong Coupling Constant from Dijet Cross Sections up to the Multi-TeV Range

    hep-ph 2024-12 conditional novelty 6.0 of 10

    A complete NNLO QCD fit to LHC and HERA dijet data yields alpha_s(m_Z) = 0.1178 with a total uncertainty of 0.0022 and tests the running coupling from 7 GeV up to 7 TeV.

  2. On Determining $\alpha_s(m_Z)$ from Dijets in $e^+e^-$ Thrust

    hep-ph 2024-12 conditional novelty 5.0 of 10

    An updated N3LL'+O(alpha_s^3) thrust analysis yields alpha_s(m_Z)=0.1136 +/- 0.0012 from a dijet-restricted global fit, stable under fit-range, gap-scheme, and hadronization-model variations.

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