Feynman Diagram
Visual pictorial representations of mathematical expressions describing the quantum interaction and scattering behavior of subatomic particles.
Governing formula
Pictorial matrix elements M_fi in QFT perturbational expansions
SI unit
Calculational Diagram
In depth
Invented by Richard Feynman. Straight lines with arrows represent fermions, wavy lines represent photons, curly lines represent gluons, and dashed lines represent Higgs/W/Z bosons. Vertices represent interaction coupling strengths.
Examples in the real world
Drawing electron-positron Møller scattering or QED electron-photon vertex interactions to calculate scattering cross-sections.