Non-Perturbative Contribution to the Thrust Distribution in $e^+ e^-$ Annihilation

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dc.creatorDavison, R. A.
dc.creatorWebber, B. R.
dc.date2008-09-19
dc.date2008-11-18
dc.date.accessioned2026-07-07T12:32:21Z
dc.date.available2026-07-07T12:32:21Z
dc.descriptionWe re-evaluate the non-perturbative contribution to the thrust distribution in $e^+e^-\to$ hadrons, in the light of the latest experimental data and the recent NNLO perturbative calculation of this quantity. By extending the calculation to NNLO+NLL accuracy, we perform the most detailed study to date of the effects of non-perturbative physics on this observable. In particular, we investigate how well a model based on a low-scale QCD effective coupling can account for such effects. We find that the difference between the improved perturbative distribution and the experimental data is consistent with a $1/Q$-dependent non-perturbative shift in the distribution, as predicted by the effective coupling model. Best fit values of $α_s(M_Z) = 0.1164^{+0.0028}_{-0.0026}$ and $α_0(2 GeV)=0.59+/-0.03$ are obtained with $χ^2/d.o.f.=1.09$. This is consistent with NLO+NLL results but the quality of fit is improved. The agreement in $α_0$ is non-trivial because a part of the 1/Q-dependent contribution (the infrared renormalon) is included in the NNLO perturbative correction.
dc.description13 pages, 10 figures. Published version, minor changes
dc.identifierhttps://arxiv.org/abs/0809.3326
dc.identifierhttp://arxiv.org/abs/0809.3326
dc.identifierEur.Phys.J.C59:13-25,2009
dc.identifierdoi:10.1140/epjc/s10052-008-0836-7
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/216757
dc.subjectHigh Energy Physics - Phenomenology
dc.titleNon-Perturbative Contribution to the Thrust Distribution in $e^+ e^-$ Annihilation
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