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why is it that the feynman diagram illustrating Bremstrahlung radiation has three vertices; basically an electron decays into a)a photon which recoils the nucleus and b)a virtual electron WHICH THEN decays into another photon and an electron of lower energy.
why can't the original electron just decay into another REAL electron (plus the photon), like in Compton scattering?
why can't the original electron just decay into another REAL electron (plus the photon), like in Compton scattering?