Test of QED in e+e→ΓΓ at LEP

Adeva, B. ; Adriani, O. ; Aguilar-Benitez, M. ; Gurtu, A. ; et., al (1990) Test of QED in e+e→ΓΓ at LEP Physics Letters B, 250 (1-2). pp. 199-204. ISSN 0370-2693

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Official URL: http://www.sciencedirect.com/science/article/pii/0...

Related URL: http://dx.doi.org/10.1016/0370-2693(90)91177-D


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 Z0→Γ,Z0→π0Γ , Z0→ΓΓΓ we find upper limits of 2.9 × 10−4,2.9x10−4 ,4.1×10−4 and 1.2×10−4, respectively. All limits are at 95% CL.

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