How to understand photons in terms of EM force carrier? [duplicate]

Say, there are 2 stationary electrons placed at a distance. The result of observation would be both flying apart with the same speed and the opposite direction, which would obey laws of conservation of momentum and energy (as electric potential energy is converted into kinetic energy). But if considered from the perspective of emitting and receiving photons, how is the process like? Where does the energy come from? Does the mass of either electron change? Or should I not try to understand it from the classic point of view?

• the checked answer here might help physics.stackexchange.com/questions/189605/… Oct 31 '15 at 17:12
• Just as a warning, the picture that suggests the literal mediation of forces trough bosons is a result of a mathematical procedure called "perturbation theory". One shouldn't take the picture too seriously, as it causes all kind of conceptual problems if one takes it too far. Oct 31 '15 at 21:18
• I was trying to answer when they closed it as duplicate. "from the perspective of emitting and receiving photons, how is the process like". This perspective comes from the Feynman diagrams . The diagrams are an iconal representation of terms in the expansion of the perturbative solution for the specific problem. In your case electron electron scattering (interaction). if you look at the diagram in this link i.stack.imgur.com/aoydt.png you will see the representation of a photon in the exchange. It is not a real photon, but a mathematical stand in. It is called a virtual photon because Nov 1 '15 at 4:00
• It has all the quantum numbers of a photon except its zero mass. Its line represents the photon propagator, en.wikipedia.org/wiki/Propagator under the total integral which calculated will give the first order term in the perturbative expansion of e-e- scattering. There are higher order terms with more virtual particles, but this one is dominant; thus the photon has been considered the main electromagnetic force carrier, introducing some confusion. Note that the propagators become infinite when the four vectors are on mass thus the exchanged energy and momentum cannot be on mass. Nov 1 '15 at 4:19
• The energy of the interaction comes from the potential : the two electrons each at its space point have potential energy , they were somehow brought there by the experimenter. Nov 1 '15 at 4:21