40 electron positron annihilation feynman diagram
Following these simple rules, we drew the Feynman diagrams for electron-positron annihilation and a pair production. From the diagram for electrostatic repulsion, we introduced the notion of a virtual particle, which is an unobservable part of the interaction. Feynman diagrams Annihilation Scattering Note: Time moves forward from the left side of the diagram to the right. The arrows are simply markers of particle motion, and are not the same as the arrows conventionally written into Feynman diagrams. In quantum electrodynamics, Bhabha scattering is the electron-positron scattering process: The positron is the electron going back in time. This is what the arrow means. But you have to remember that in physics, cause and effect are not by the direction of the arrows, but by the direction of entropy increase, which is up in the diagram regardless of which way the particles go relative to their own proper time. Electron positron annihilation feynman diagram