Compton scattering as a concrete QED process tying together diagrams, conservation laws, and measurable shifts.
Compton scattering is one of the clearest places to see how QED diagrams, conservation laws, and physical observables line up. Incoming and outgoing particle states, channel structure, and wavelength shift all become one coherent story.
It addresses process-specific searches where learners want a worked physical example instead of abstract formalism.
A full lecture reconstruction introducing perturbative quantum electrodynamics from the Coulomb-gauge Hamiltonian, identifying the fine-structure constant as the small expansion parameter, and using time-independent perturbation theory to analyze the QED vacuum and one-electron states.
A full lecture reconstruction showing why naive low-order perturbative QED corrections to particle energies are problematic, why Compton scattering is the first clean finite order-α process, and how Lorentz-invariant scattering amplitudes emerge only after coherent addition of all electron and positron intermediate-state processes.
A full lecture reconstruction showing how Lorentz-invariant perturbative QED emerges from the QED path integral as variational calculus on a Gaussian generating functional, and how the surviving terms organize into Feynman diagrams and Feynman rules.
Introduce the electron-photon vertex as a perturbative building block. See how incoming and outgoing particles meet at a point where charge and energy-momentum are exchanged through the coupling.
Animate incoming and outgoing states, the two leading diagrams, and the kinematic shift.