The high-energy large-scale-angle limit of the completely differential cross section for the process e^-+Z→e^-+e⁺+e^-+Z (or for the process with all or some of the particles replaced by muons) is computed for arbitrary helicities of incident and final particles. This process is interesting as a test of electrodynamics and of the statistics of the muon. The formula is short and perhaps suitable for numerical integrations.
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Bjorken et al. (1967) studied this question.
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