The causal arrangement of the two extended emission and detection sources and the photon source is considered. The emission source emits the charged particle and photon. The photon source which is located between emission and detection sources is capable of the transmitting of space-like momenta. The photon propagates undisturbed between emission and detection sources, while the charged particle is rejected by the extended photon source. The result of such process is the modification of the vacuum-to-vacuum amplitude in form of the additional term which can be interpreted as the additional magnetic moment of electron. The derivation is realized with the mathematical simplicity and the Schwinger pedagogical clarity.
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Miroslav Pardy (2024) studied this question.
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