Section outline
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- Feynman rules: identical particles in final state; sum on final states; average on initial states.
- Feynman rules for toy scalar theory. Interaction as exchange of mediator particle.
- Charge conservation and gauge symmetry.
- QED Feynman diagrams.
- e+e- anihilation in a muon pair.
- Hydrogen levels, fine and hyperfine structure, Lamb shift, [Lamb-Retherford experiment]
- Positronium, level structure, decay channels.
- Alpha QED evolution with energy.