Bibliographic Metadata
- TitleEnergieabhängigkeit von Ereignisformobservablen : Messungen und Studien zu Potenzreihenkorrekturen und Schemenabhängigkeiten / vorgelegt von Ralf Reinhardt
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- Published
- Description1 Computerdatei (ca. 3,8 MB) : Auszüge (Titel, Inhaltsverzeichnis, ca. 140 KB)
- Institutional NoteZugl.: Wuppertal, Univ., Diss.
- LanguageGerman
- Document typeDissertation (PhD)
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- IIIF
English
Infrared and collinear safe event shape distributions and their mean values are determined in e+e- collisions at centre-of-mass energies between 45 and 202 GeV. A phenomenological analysis based on power correction models including hadron mass effects for both differential distributions and mean values is presented. Using power corrections alpha_s is extracted from mean values and shapes. In an alternative approach renormalisation group invariance (RGI) is used as an explicit constraint, leading to a consistent description of mean values without the need for sizeable power corrections. The QCD beta-function is precisely measured using this approach. From the DELPHI data on Thrust, including data from low energy experiments, one obtains beta_0 = 7.86 +- 0.32 for the one loop coefficient of the beta-function or, assuming QCD for the number of active flavours, n_f = 4.75 +- 0.44 These values agree well with the QCD expectation of beta_0=7.67 and n_f=5.
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