Determination of αS using OPAL hadronic event shapes at √s=91--209 GeV and resummed NNLO calculations

• Verfasst von: Abbiendi, Giovanni [VerfasserIn]
• Verfasst von: Bock, Peter [VerfasserIn]
• Titel: Determination of αS using OPAL hadronic event shapes at √s=91--209 GeV and resummed NNLO calculations
• Körperschaft: OPAL Collaboration [VerfasserIn]
• Verf.angabe: The OPAL Collaboration*
• E-Jahr: 2011
• Jahr: 21 September 2011
• Umfang: 21 S.
• Fussnoten: *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
• Titel Quelle: Enthalten in: The European physical journal / C
• Ort Quelle: Berlin : Springer, 1998
• Jahr Quelle: 2011
• Band/Heft Quelle: 71(2011), 9, Artikel-ID 1733, Seite 1-21
• ISSN Quelle: 1434-6052
• DOI: doi:10.1140/epjc/s10052-011-1733-z
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1793712050

Abstract

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.