Abstract
The present PETRA experiments on Bhabha scattering, lepton-pair production and two-photon annihilation are consistent with exact QED up to ]q2I ≈ 1000 GeV2. Lower bounds on the cut-off parameters Λ exceed 100 GeV which is equivalent to tests of QED down to distances < 2 · 10-1a cm. Electro-weak interference effects become sizeable at the highest PETRA energies. Further tests of QED up to LEP energies are desirable and not impossible, providing weak effects are properly isolated. The two-photon annihilation process is particularly well suited for such studies, since Zoγ interference is absent here in first order perturbation theory:
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Hepp, V. (1981). Test of Quantum Electrodynamics at high momentum transfers. In: Gräff, G., Klempt, E., Werth, G. (eds) Present Status and Aims of Quantum Electrodynamics. Lecture Notes in Physics, vol 143. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0033879
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DOI: https://doi.org/10.1007/BFb0033879
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