Abstract
Without taking into account the electromagnetic structure, caused by the strong interactions, all charged particles contribute with nearly the same weight to the electromagnetic vacuum polarization at very high energy. The structure effects come in via the form factors at timelike momentum transfer. By making use of the strong asymptotic decrease of the nucleon form factors for spacelike argument, it is inferred from an unsubtracted dispersion relation that the nucleon contribution to vacuum polarization can be neglected asymptotically, compared to the contribution of the unstructured leptons.
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