Hadronization effects in event shape moments

We study the moments of hadronic event shapes in e + e ‐ annihilation within the context of next-to-next-to-leading order (NNLO) perturbative QCD predictions combined with non-perturbative power corrections in the dispersive model. This model is extended to match the NNLO perturbative prediction. The resulting theoretical expression has been compared to experimental data from JADE and OPAL, and a new value for � s ( M Z ) has been determined, as well as of the average coupling � 0 in the non-perturbative region below � I =2 GeV within the dispersive model: beginarrayrcl�s(MZ) = 0.1153ś0.0017(exp)ś0.0023(th), 5pt]0 = 0.5132ś0.0115(exp)ś0.0381(th).Theprecisionofthes(MZ)valuehasbeenimprovedincomparisontothepreviouslyavailablenext− to−leadingorderanalysis.Weobservethattheresultingpowercorrectionsareconsiderablylargerthanthoseestimatedfromhadronisationmodelsinmulti− purposeeventgeneratorprograms. DOI: https://doi.org/10.1140/epjc/s10052-010-1288-4 Posted at the Zurich Open Repository and Archive, University of Zurich ZORA URL: https://doi.org/10.5167/uzh-34344 Accepted Version Originally published at: Gehrmann, T; Jaquier, M; Luisoni, G (2010). Hadronization effects in event-shape moments. European Physical Journal C Particles and Fields, 67(1-2):57-72. DOI: https://doi.org/10.1140/epjc/s10052-010-1288-4 ar X iv :0 91 1. 24 22 v1 [ he pph ] 1 2 N ov 2 00 9 ZU-TH 14/09 Hadronization effects in event shape moments T. Gehrmann, M. Jaquier and G. Luisoni Institut für Theoretische Physik, Universität Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland Abstract We study the moments of hadronic event shapes in ee annihilation within the context of next-tonext-to-leading order (NNLO) perturbative QCD predictions combined with non-perturbative power corrections in the dispersive model. This model is extended to match upon the NNLO perturbative prediction. The resulting theoretical expression has been compared to experimental data from JADE and OPAL, and a new value for αs(MZ) has been determined, as well as of the average coupling α0 in the non-perturbative region below μI = 2 GeV within the dispersive model: αs(MZ) = 0.1153 ± 0.0017(exp) ± 0.0023(th), α0 = 0.5132 ± 0.0115(exp) ± 0.0381(th) , The precision of the αs(MZ) value has been improved in comparison to the previously available next-to-leading order analysis.We study the moments of hadronic event shapes in ee annihilation within the context of next-tonext-to-leading order (NNLO) perturbative QCD predictions combined with non-perturbative power corrections in the dispersive model. This model is extended to match upon the NNLO perturbative prediction. The resulting theoretical expression has been compared to experimental data from JADE and OPAL, and a new value for αs(MZ) has been determined, as well as of the average coupling α0 in the non-perturbative region below μI = 2 GeV within the dispersive model: αs(MZ) = 0.1153 ± 0.0017(exp) ± 0.0023(th), α0 = 0.5132 ± 0.0115(exp) ± 0.0381(th) , The precision of the αs(MZ) value has been improved in comparison to the previously available next-to-leading order analysis.