Question

In a feynman diagram corresponding to electron-electron Møller scattering, the amplitudes are related to the 'order'...

In a feynman diagram corresponding to electron-electron Møller scattering, the amplitudes are related to the 'order' of diagram. So in a 2nd order diagram the amplitude would be more than in a 4th order diagram.

The question is: By how much would the amplitude for a 4th order QED diagram be compared to a 2nd order QED diagram?

This is "as a rule of thumb".

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