QED Feynman Diagram Explorer

A catalog of Feynman diagrams for electron-only QED, with full amplitude chains from diagram to number.

Quantum electrodynamics is the most precisely tested theory in the history of science—its predictions agree with experiment to better than one part in a trillion. This site shows how those predictions are computed: the complete chain from Feynman diagram to physical number, for every† diagram in the simplest QED.

Explore the catalog

The catalog contains 23 diagrams across 9 processes, with computational chains showing every step from diagram to number.

Processes

9 processes organized by external legs—what comes in, what goes out.

Diagrams

23 diagrams with SVGs, amplitude chains, and divergence classification.

Topologies

11 diagram topologies: s-channel, bubble, triangle, box, and more.

Divergences

UV, IR, and finite—the divergence structure of loop diagrams and how they are resolved.

Sample diagrams

Vertex correction

1-loop UV div IR div

Vacuum polarization

1-loop UV div

Electron self-energy

1-loop UV div IR div

Bhabha s-channel

tree finite

Light-by-light box

1-loop finite

Compton s-channel

tree finite

See all 23 diagrams →

† Well, not every diagram. For a fixed set of external legs and loop order the number of diagrams is finite, but the number of possible external leg configurations is not. The catalog covers all tree-level and one-loop diagrams for the physically important processes, plus selected two-loop corrections. Work in progress.