Speaker
Description
Correlation functions of the asymptotic energy and charge flux connect the macroscopic structure of collider events to the underlying microscopic dynamics of the Standard Model. This talk presents measurements of the track energy-energy correlator and the one-point charge correlator in DELPHI Open Data in e+e- collisions. The measured energy-energy correlator is compared to record-precision theoretical predictions, at NNLL accuracy in the collinear region and NNNNLL accuracy in the back-to-back region, covering the full spectrum of the correlator and probing QCD over three orders of magnitude in scale. It reveals interesting emergent phenomena, including light-ray quasi-particle states, flux-tube excitations, and their transitions into confined hadrons. The measured one-point charge correlator exhibits a clear modulation, in agreement with both the PYTHIA 8.3 Monte Carlo prediction and theory calculation at N3LO in QCD, representing the first direct observation of the differential asymmetry shape in data. This talk also presents phenomenological studies of the correlation functions, motivating future precision physics programs, whether at the FCC-ee or through further analysis of archival LEP data.
