TL;DR
This paper tests Quantum Electrodynamics (QED) predictions for e+e- -> gamma-gamma processes using LEP data, compares measurements to theory, and searches for new physics via multi-photon events.
Contribution
It provides experimental validation of QED with precise differential cross-section measurements and sets limits on beyond Standard Model physics using multi-photon final states.
Findings
Measured differential cross-sections agree with QED predictions
Set limits on parameters for new physics beyond the Standard Model
Conducted a direct search for photonically decaying resonances
Abstract
In the Standard Model the process e+e- -> gamma-gamma is fully described by QED. Measurements of the differential cross-sections from the four LEP experiments are compared to the QED expectation and limits are set on parameters describing physics beyond the Standard Model. Three-photon events are used for a direct search for a photonically decaying resonance produced together with a photon.
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