Global analysis determines the strong coupling constant from electron-positron collisions, indicating robust agreement with quantum chromodynamics across broad energy scales.
A bstract We present a comprehensive global analysis of Energy-Energy Correlation (EEC) data in electron-positron annihilation into hadrons, spanning a wide range of center-of-mass energies (7.7 GeV ≤ √s s ≤ 91.2 GeV). In the back-to-back (two-jet) region, we resum to all orders the logarithmically-enhanced contributions up to next-to-next-to-next-to-leading logarithmic (N 3 LL) accuracy. The resummed results are consistently matched to fixed-order calculations up to O(αS³) O α S 3 . Our resummation formalism also incorporates dominant heavy-quark mass effects and models non-perturbative power corrections by means of an analytic dispersive approach. A simultaneous fit yields an excellent description of experimental data across all energies, enabling a precise determination of the strong coupling, αS(mZ²) α S m Z 2 = 0.1192 ± 0.0028, as well as the non-perturbative parameters, including those characterizing the Collins-Soper evolution kernel. Our analysis includes, for the first time in a global fit, datasets from the ALEPH and AMY collaborations.
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Aglietti et al. (2026) studied this question.
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