In the Standard Model, the mass of the photon is zero, while the photon becomes massive if it acts as a mediator between two electrons. Why does this happen? Does it mean that the Standard Model cannot describe the interaction between two electrons?
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The relativistic mass of the photon is not zero, it is $\frac{h\nu}{c^2}$.
The rest mass of the photon is zero, but according to spec. rel it goes always with $c$.
peterh
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