Particle Decay:
Feynman Diagrams

a Feynman diagram vertex

(The colours shown are for illustrative purposes only.)

Feynman diagrams are used to represent particle interactions. They are made up of a series of vertices (interaction points) all of which involve three components.

The example shows a boson (shown blue) and two particle tracks. One of the particle tracks always points into the vertex and the other out of it. If a particle track points in the direction of time it is a particle (shown orange), however if it is in the opposite direction it is an antiparticle (shown green).

By convention, time always progresses from left to right.

  Straight lines represent leptons, quarks & their composite particles, hadrons.
  Dashed lines are sometimes used to represent neutrinos.
  Wiggly lines represent the force bosons photon, W & Z
  Corkscrew lines represent gluons.

If you want to know more, look at more feynman diagrams.

Last modified Sat 22 December 2001 . View page history
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