Determination of αS using OPAL hadronic event shapes at √s=91--209 GeV and resummed NNLO calculations
Hadronic event shape distributions from e+e− annihilation measured by the OPAL experiment at centre-of-mass energies between 91 GeV and 209 GeV are used to determine the strong coupling αS. The results are based on QCD predictions complete to the next-to-next-to-leading order (NNLO), and on NNLO cal...
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| Hauptverfasser: | , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
21 September 2011
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The European physical journal. C, Particles and fields
Year: 2011, Jahrgang: 71, Heft: 9, Pages: 1-21 |
| ISSN: | 1434-6052 |
| DOI: | 10.1140/epjc/s10052-011-1733-z |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1140/epjc/s10052-011-1733-z
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| Verfasserangaben: | The OPAL Collaboration* |
| Zusammenfassung: | Hadronic event shape distributions from e+e− annihilation measured by the OPAL experiment at centre-of-mass energies between 91 GeV and 209 GeV are used to determine the strong coupling αS. The results are based on QCD predictions complete to the next-to-next-to-leading order (NNLO), and on NNLO calculations matched to the resummed next-to-leading-log-approximation terms (NNLO + NLLA). The combined NNLO result from all variables and centre-of-mass energies is while the combined NNLO + NLLA result is The completeness of the NNLO and NNLO + NLLA results with respect to missing higher order contributions, studied by varying the renormalization scale, is improved compared to previous results based on NLO or NLO + NLLA predictions only. The observed energy dependence of αS agrees with the QCD prediction of asymptotic freedom and excludes the absence of running. |
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| Beschreibung: | *The OPAL Collaboration: G. Abbiendi, P. Bock [und 207 weitere Personen] Im Titel ist der Buchstabe S tiefgestellt Im Titel steht der Buchstabe s unter dem Wurzelsymbol Gesehen am 23.02.2022 |
| Beschreibung: | Online Resource |
| ISSN: | 1434-6052 |
| DOI: | 10.1140/epjc/s10052-011-1733-z |