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Hadronization effects in event-shape moments


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.

Abstract

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 α s ( M Z ) has been determined, as well as of the average coupling α 0 in the non-perturbative region below μ I =2 GeV within the dispersive model: begin{array}{rcl}α_s(M_Z)&=&0.1153±0.0017(exp)±0.0023(th),\[5pt]α_0&=&0.5132±0.0115(exp)±0.0381(th). The precision of the α s ( M Z ) value has been improved in comparison to the previously available next-to-leading order analysis. We observe that the resulting power corrections are considerably larger than those estimated from hadronisation models in multi-purpose event generator programs.

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 α s ( M Z ) has been determined, as well as of the average coupling α 0 in the non-perturbative region below μ I =2 GeV within the dispersive model: begin{array}{rcl}α_s(M_Z)&=&0.1153±0.0017(exp)±0.0023(th),\[5pt]α_0&=&0.5132±0.0115(exp)±0.0381(th). The precision of the α s ( M Z ) value has been improved in comparison to the previously available next-to-leading order analysis. We observe that the resulting power corrections are considerably larger than those estimated from hadronisation models in multi-purpose event generator programs.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:May 2010
Deposited On:02 Mar 2011 17:17
Last Modified:05 Apr 2016 14:09
Publisher:Springer
ISSN:1434-6044
Publisher DOI:10.1140/epjc/s10052-010-1288-4
Related URLs:http://arxiv.org/abs/0911.2422
Permanent URL: http://doi.org/10.5167/uzh-34344

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