Recent theoretical developments, as well as experimental measurements at hadron collisions, have renewed interest in studying event shape variables in e+e− collisions. We present a measurement of thrust and track-based energy-energy correlator in e+e− collisions at center-of-mass energy of 91.2 GeV, using newly released open data from the DELPHI experiment. The event shapes, measured with unprecedented resolution and precision, are compared to various Monte Carlo and analytic predictions. Leveraging DELPHI's unique detector geometry and reconstruction capabilities, the track energy-energy correlator measurement provides data with the highest angular resolution, offering critical inputs for precision tests of QCD in both collinear and back-to-back limits. This note presents the first physics analysis using DELPHI open data and establishes benchmarks necessary for future studies exploiting this legacy dataset.
@article{arxiv.2510.18762,
title = {Analysis note: measurement of thrust and track energy-energy correlator in $e^+e^-$ collisions at 91.2 GeV with DELPHI open data},
author = {Jingyu Zhang and Tzu-An Sheng and Yu-Chen Chen and Hannah Bossi and Anthony Badea and Austin Baty and Chris McGinn and Yen-Jie Lee and Yi Chen},
journal= {arXiv preprint arXiv:2510.18762},
year = {2025}
}