b (source code)
= b
{scope}
The original <tree-level Feynman diagrams> below use solid arrowed <fermion> lines and dashed <scalar field> lines. The labelled internal <momenta> run in the indicated directions; $g$ and $\lambda$ label the corresponding <interaction vertices>.
\Image[/past-exam-of-the-quantum-field-theory-course-of-the-university-of-oxford/2021-yukawa-tree-diagrams.png]
{title=Momentum-labelled tree diagrams for the four processes; the middle row contains the two exchange orderings.}
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