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Measurement of event shape distributions and moments in e+e- -> hadrons at 91-209 GeV and a determination of alpha_s

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arxiv hep-ex/0503051 v1 pith:7SOT7B6M submitted 2005-03-30 hep-ex

The OPAL Collaboration: G. Abbiendi , et al This is my paper · ORCID
classification hep-ex
keywords alphadistributionsenergyeventmomentsshapedataevolution
verification ladder T0 review T1 audit T2 compute T3 formal
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We have studied hadronic events from e+e- annihilation data at centre-of-mass energies from 91 to 209 GeV. We present distributions of event shape observables and their moments at each energy and compare with QCD Monte Carlo models. From the event shape distributions we extract the strong coupling alpha_s and test its evolution with energy scale. The results are consistent with the running of alpha_s expected from QCD. Combining all data, the value of alpha_s(M_Z) is determined to be alpha_s(M_Z) = 0.1191 +- 0.0005 (stat.) +- 0.0010 (expt.) +- 0.0011 (hadr.) +- 0.0044 (theo.). The energy evolution of the moments is also used to determine a value of alpha_s with slightly larger errors: alpha_s(M_Z) = 0.1223 +- 0.0005 (stat.) +- 0.0014 (expt.) +- 0.0016 (hadr.) +0.0054 -0.0036 (theo.).

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Thrust distribution in electron-positron annihilation at full NNNLL+NNLO (and beyond) in QCD

    hep-ph 2025-02 conditional novelty 7.0 of 10

    Laplace-space resummation of the thrust distribution at N4LL accuracy yields alpha_S(mZ^2) = 0.1181 +/- 0.0018, consistent with the world average, while physical-space resummation gives a lower value.

  2. Recoil-Safe Subtraction, Matching and Merging in e+e- to hadrons

    hep-ph 2025-07 conditional novelty 6.0 of 10

    The Alaric shower is matched to NLO matrix elements and merged to five jets in e+e- to hadrons, with new analytic subtraction terms validated against Catani-Seymour subtraction.

  3. Fits of $\alpha_s$ from event-shapes in the three-jet region: extension to all energies

    hep-ph 2025-01 conditional novelty 4.0 of 10

    The strong coupling at the Z mass is measured as 0.1181 from event-shape distributions using three-jet power corrections, with hadron-mass scheme ambiguity as the largest uncertainty.

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