Elsevier

Physics Letters B

Volume 250, Issues 1–2, 1 November 1990, Pages 199-204
Physics Letters B

Test of QED in e+e→γγ at LEP

https://doi.org/10.1016/0370-2693(90)91177-DGet rights and content

Abstract

We have measured the cross-section of the reaction e+e → γγ at center of mass energies around the Z0 mass. The results are in good agreement with QED predictions. For the QED cutoff parameters the limit of Λ+ > 103 GeV and Λ 118 GeV are found. For the decays Z0γ,Z0π0γ, Z0γγγ we find upper limits of 2.9 × 10−4,2.9×10−4 ,4.1×10−4 and 1.2×10−4, respectively. All limits are at 95% CL.

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Supported by the German Bundesministerium für Forschung und Technologie.

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