Revisiting strong-coupling determinations from $e^+ e^-$ event shapes

TL;DR

This paper reevaluates the uncertainties in determining the strong coupling constant from electron-positron event shape data, focusing on scheme dependence and scale choices affecting theoretical predictions.

Contribution

It provides a comprehensive reassessment of theoretical uncertainties in strong-coupling extractions from $e^+ e^-$ data, emphasizing scheme and scale dependence.

Findings

Quantified the impact of scheme dependence on strong-coupling determinations.

Analyzed the effects of scale choices on perturbative corrections.

Identified key sources of theoretical uncertainty in event shape analyses.

Abstract

We reassess the theoretical uncertainties of strong-coupling determinations from a global fit to the $e^+ e^-$ thrust data, focusing in particular on the scheme dependence associated with the applied renormalon-cancellation prescription and on the choice of scale parameters that are used to estimate higher-order perturbative corrections in all sectors of the calculation.