Hard-Photon Production and Tests of QED at LEP
L3 Collaboration
TL;DR
This paper reports measurements of multi-photon production in electron-positron collisions at LEP, confirming QED predictions and setting limits on possible new physics deviations.
Contribution
It provides precise measurements of e+e- -> n gamma cross sections at 183 and 189 GeV and tests QED with new limits on contact interactions and excited electrons.
Findings
Results agree with Standard Model predictions
Limits set on contact interaction cut-offs
Constraints on excited electron masses
Abstract
The total and differential cross sections of the process e+e- -> n gamma with n >= 2 are measured using data collected by the L3 experiment at centre-of-mass energies of \sqrt{s}=183 and 189 GeV. The results are in agreement with the Standard Model expectations. Limits are set on deviations from QED, contact interaction cut-off parameters and masses of excited electrons.
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