Speaker
Description
The one-point charge correlator probes the charge-asymmetric angular structure of hadronic final states in $e^+e^-$ collisions. In perturbative QCD, the structure is intimately linked to the axial-vector-vector triangle anomaly, making it highly robust against higher-order corrections and offering a novel, theoretically clean perspective on the forward-backward asymmetry, $A_{\rm FB}$. We present the first measurement of this observable using DELPHI Open Data collected at $\sqrt{s} = 91.2$ GeV. The data, corrected for detector effects, exhibit a clear $\sin(2\theta)$ modulation, in agreement with both the PYTHIA 8.3 Monte Carlo prediction and theory calculation at N$^3$LO in QCD, representing the first direct observation of the differential asymmetry shape in data. This work provides experimental insights into charge correlator measurements and motivates future precision electroweak programs at the FCC-ee or through further analysis of archival LEP data.