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

Abstract

We 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 ${\alpha }_s(M_Z)=0.1164_{-0.0026}^{+0.0028}$ and ${\alpha }_0(2GeV)=0.59+/-0.03$ are obtained with ${\chi }^2/d.o.f.=1.09$. This is consistent with NLO+NLL results but the quality of fit is improved. The agreement in ${\alpha }_0$ is non-trivial because a part of the 1/Q-dependent contribution (the infrared renormalon) is included in the NNLO perturbative correction.

13 pages, 10 figures. Published version, minor changes

References in corpus (8)

• A precise determination of alpha_s from LEP thrust data using effective field theory
• NNLO corrections to event shapes in $e^{+}{e}^{-}$ annihilation
• NNLO corrections to 3-jet observables in electron-positron annihilation
• Second-order QCD corrections to the thrust distribution
• Infrared structure of e+e- --> 3 jets at NNLO
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• Matching NLLA+NNLO for event shape distributions

Cited by in corpus (6)

• Event shapes and jet rates in electron-positron annihilation at NNLO
• Determination of the strong coupling constant using matched NNLO+NLLA predictions for hadronic event shapes in e+e- annihilations
• NNLO moments of event shapes in e+e- annihilation
• Electroweak corrections to three-jet production in electron-positron annihilation
• Matching of Resummed NLLA with Fixed NNLO for Event Shapes
• Event Shape Variables at NLLA+NNLO