A global analysis of energy-energy correlation data: determination of αS and non-perturbative QCD parameters

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 (7.7GeV ≤ √s ≤ 91.2GeV). 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 (N3LL) accuracy. The resummed results are consistently matched to fixed-order calculations up to O(α3 S). 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(m2 Z) = 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.