Speaker
Description
The recent achievement of percent-level theoretical precision in the calculation of track energy-energy correlators (EEC) provides a transformative opportunity to characterize the fundamental structure of QCD. We present a precision measurement of the track EEC in $e^+e^-$ collisions using DELPHI Open Data, spanning an extensive energy range from the $Z$-pole ($91.2$ GeV) up to $202$ GeV. The measured distributions are corrected to the particle level and used to perform a direct confrontation between archived collider data and record-precision theory predictions, incorporating NNLL and NNNNLL accuracy at the collinear and back-to-back limits, respectively. This systematic study of the EEC’s energy evolution provides a rigorous test of the renormalization group equations and the running of the strong coupling constant, $\alpha_s$. Our results establish a new benchmark for precision QCD at lepton colliders and pave the way for a next-generation determination of $\alpha_s$ with sub-percent uncertainties.
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