feynmangraph

Web frontend for building Feynman diagrams. Hand-draw them on a canvas with live conservation/legality checks, or type a process like e+ e- → mu+ mu- and have gammaloop enumerate the diagrams for you. Forward-scattering cuts, UFO models, and round-trip .dot export included.

Live demo: https://huggingface.co/spaces/ecavan/feynmangraph

1-loop electron self-energy with forward-scattering glue between the incoming and outgoing legs.

Install

pip install feynmangraph
feynmangraph setup     # builds gammaloop
feynmangraph serve     # http://localhost:8000

The Canvas, Import, and Export tabs work without gammaloop; only the Generate tab needs it. Skip setup if you only want the editor.

What it does

• Canvas. Drag vertices, connect propagators, place externals. Charge, lepton number, baryon number, and color triality are checked live, and each vertex is matched against the UFO interaction list — you can't build something that isn't a real diagram.
• Generate. Pick a process spec; gammaloop enumerates the diagrams. Speed-up controls: restrict to a particle subset and pick the numerator-isomorphism grouping mode (no_grouping for fastest).
• Forward-scattering cuts. Pair two externals via isCut from a single dropdown. Round-trips through .dot including Linnet's node [isCut="X"] shorthand.
• UFO models. Upload a .tar.gz or .zip — particles and vertex rules light up immediately.
• Export. Single diagram or whole gallery → gammaloop-format .dot with projector, half-port IDs, lmb_id chords, and isCut glue.

Built on gammaloop (diagram enumeration + .dot dialect), FastAPI, React + reactflow.

License

MIT