Feynman Diagrams

Build and animate Feynman diagrams with a drag-and-drop editor

The Language of Particle Physics

Feynman diagrams are the visual language of quantum field theory. Invented by Richard Feynman in the 1940s, they represent particle interactions as pictures where each line and vertex encodes precise mathematical content. Straight lines are fermions, wavy lines are photons, coiled lines are gluons, and dashed lines are the Higgs.

Feynman Diagram Builder

Build your own Feynman diagrams! Place vertices, then connect them with propagators. Choose from fermion (solid), photon (wavy), gluon (coiled), W/Z (wavy), or Higgs (dashed) line types.

Propagator:
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Famous Processes

Browse a gallery of the most important Feynman diagrams in particle physics, from simple QED scattering to the Higgs discovery channel.

Electron-Electron Scattering (Møller)

Vertex Rules

The Standard Model has a finite set of allowed vertices. Each vertex represents a fundamental interaction: a fermion emitting or absorbing a boson. Click any vertex to learn what it represents.

Diagram Animator

Watch particles propagate through a Feynman diagram in real time. Glowing dots travel along propagator lines, showing the flow of particles through the interaction.

Diagram:
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Key Takeaways

  • Line types encode particles — solid (fermion), wavy (photon/W/Z), coiled (gluon), dashed (Higgs)
  • Vertices are interactions — each vertex conserves charge, momentum, and quantum numbers
  • Internal lines are virtual — they represent quantum fluctuations, not real particles
  • Each diagram = a term in a sum — the full amplitude sums over all possible diagrams