- #1
Phys12
- 351
- 42
In the first Feynman diagram, an electron comes in, emits a photon and then leaves. Is this an allowed process?
Because if you rotate the diagram by 90o, the diagram should be just as valid, but it doesn't seem to be since it would violate the law of conservation of momentum. So is the primitive vertex by itself a valid phenomenon?
Because if you rotate the diagram by 90o, the diagram should be just as valid, but it doesn't seem to be since it would violate the law of conservation of momentum. So is the primitive vertex by itself a valid phenomenon?