Answer to Question #90605 in Field Theory for Vasiliy

Question #90605
Explain Fary's theorem for quantum electrodynamics.
1
Expert's answer
2019-06-06T10:05:16-0400

Fary's theorem states that as electromagnetic field is antisymmetric under parity transformation, all Feynman diagrams with odd number of external photons lines is zero. And, as a result, all odd fermion loops have zero matric element.


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