QED Feynman Lab

Interactive QED diagrams: processes with s/t/u channels and Mandelstam kinematics, one-loop gallery, and a rule-checked vertex builder.

About this tool

QED Feynman Lab — explore tree-level QED processes with s/t/u channels and Mandelstam variables, browse standard one-loop corrections, or build a diagram and check QED vertex rules (one photon + two fermions, charge conservation). Educational schematics only — not a real amplitude calculator.

Process tab: pick a reaction, channel, √s and scattering angle; Draw or Animate. Loops: self-energy, vacuum polarization, vertex, box, light-by-light. Builder: click to place legs/vertices, click a node then another to connect; Validate.