Summary
Higher-order (α3) QED contributions are compared with the γ-Z0 interference at the tree level for the difference between the two differential cross-sections dσ/dΩ(e∓+μ∓→e∓+μ∓) and dσ/dΩ(e∓+μ±→e∓+μ±). It is found that the γ-Z0 interference is comparable with the QED contributions at c.m. energy of 13 GeV and it is more important at higher energy.
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D’Ambrosio, G. Electron-muon scattering in the electroweak unified theory. Lett. Nuovo Cimento 38, 593–598 (1983). https://doi.org/10.1007/BF02782748
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DOI: https://doi.org/10.1007/BF02782748