Speaker
Description
Recent advances in data preservation and modern analysis techniques have enabled a new generation of precision measurements using archived electron-positron collision data collected at the Large Electron-Positron Collider (LEP). The Electron-Positron Alliance is developing a broad physics program that applies contemporary experimental and theoretical tools to these unique datasets, establishing them as a precision laboratory for studies of Quantum Chromodynamics and jet physics. In this talk, we present an overview of recent results based on archived ALEPH and DELPHI data, including measurements of event-shape observables, jet spectra and substructure, energy-energy correlators, identified-particle production, and other precision QCD observables. These measurements probe perturbative radiation, hadronization, and the transition from partons to hadrons in a clean experimental environment, while providing stringent tests of modern event generators and theoretical calculations. We also discuss ongoing efforts to preserve, modernize, and extend the scientific reach of legacy collider datasets using new analysis methodologies. Together, these results demonstrate the continuing scientific value of archived LEP data, providing precision benchmarks for present and future collider experiments and illustrating the broader potential of the “recycling frontier” in particle physics.