Feynman rule
= Feynman rule
{c}
{wiki=Feynman_diagram}
Feynman rules translate each diagram into momentum-space factors for propagators, vertices, external states, momentum conservation and loop integration.
= Feynman rule
{c}
{wiki=Feynman_diagram}
Feynman rules translate each diagram into momentum-space factors for propagators, vertices, external states, momentum conservation and loop integration.