Determination of $$\alpha _{S}$$ beyond NNLO using event shape averages
نویسندگان
چکیده
منابع مشابه
Event Shape Variables at NLLA+NNLO
The reaction of ee annihilation into three jets has played historically a very prominent role for phenomenology. It permitted for example the discovery of the gluon and the measurement of its properties and allows also a precise determination of the strong coupling constant αs, since the deviation from two-jet configurations is proportional to it. Not only jet rates, but also the shape of the s...
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Precision studies of QCD at ee colliders are based on measurements of event shapes and jet rates. To match the high experimental accuracy, theoretical predictions to nextto-next-to-leading order (NNLO) in QCD are needed for a reliable interpretation of the data. We report the first calculation of NNLO corrections (O(α s )) to three-jet production and related event shapes, and discuss their phen...
متن کاملFirst determination of the strong coupling constant using NNLO predictions for hadronic event shapes in e+e− annihilations
Dissertori, G; Gehrmann-DeRidder, A; Gehrmann, T; Glover , E W N; Heinrich, G; Stenzel, H Dissertori, G; Gehrmann-DeRidder, A; Gehrmann, T; Glover , E W N; Heinrich, G; Stenzel, H (2008). First determination of the strong coupling constant using NNLO predictions for hadronic event shapes in e+e− annihilations. Journal of High Energy Physics, 2008(2):040. Postprint available at: http://www.zora....
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We present a determination of the strong coupling constant from a fit of QCD predictions for six event-shape variables, calculated at next-to-next-to-leading order (NNLO) and matched to resummation in the next-to-leading-logarithmic approximation (NLLA). These event shapes have been measured in e+e− annihilations at LEP, where the data we use have been collected by the ALEPH detector at centre-...
متن کاملDetermination of the Strong Coupling αS from hadronic Event Shapes and NNLO QCD predictions using JADE Data
Event Shape Data from ee annihilation into hadrons collected by the JADE experiment at centre-of-mass energies between 14 GeV and 44 GeV are used to determine the strong coupling αS. QCD predictions complete to next-to-next-to-leading order (NNLO), alternatively combined with resummed next-to-leading-log-approximation (NNLO+NLLA) calculations, are used. The combined value from six different eve...
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ژورنال
عنوان ژورنال: The European Physical Journal C
سال: 2021
ISSN: 1434-6044,1434-6052
DOI: 10.1140/epjc/s10052-021-08975-3