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- W2892294543 abstract "Infrared and collinear safe event shape distributionsand their mean values are determined in e+e- collisions at centre-of-mass energies between 45 and 202 GeV. Aphenomenological analysis based on power correction models including hadron mass effects for both differential distributions and mean values is presented. Usingpower 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 withoutthe 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 ofbeta_0=7.67 and n_f=5." @default.
- W2892294543 created "2018-09-27" @default.
- W2892294543 creator A5013149394 @default.
- W2892294543 date "2002-08-02" @default.
- W2892294543 modified "2023-09-24" @default.
- W2892294543 title "Energieabhängigkeit von Ereignisformobservablen" @default.
- W2892294543 hasPublicationYear "2002" @default.
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