= Six-point amplitudes in phi-fourth theory
{title2=$2\to4$}
= Six-point amplitude in phi-fourth theory
{synonym}
For a connected six-external-leg <Feynman diagram> made from quartic vertices, $4V=6+2I$ and $L=I-V+1$ give $V=L+2$, $I=2L+1$. A tree therefore has two vertices and one internal line; partitioning six labelled external legs into two triples gives ten tree channels. A one-loop triangle has three vertices, three internal lines and two external legs at each vertex. With external labels fixed, that triangle has <symmetry factor> one. Other one-loop topologies also contribute to the full amplitude.
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