a (source code)
= a
{scope}
The original <Feynman diagrams> below distinguish elementary weak and electromagnetic vertices from an <effective hadronic vertex>. <fermion> arrows track fermion number; time runs left to right.
\Image[/past-exam-of-the-particle-and-nuclear-physics-course-of-the-university-of-cambridge/2016/paper-1-decay-diagrams.png]
{title=Four decay channels and their dominant interactions}
{description=Original diagrams. Panel (iii) is an effective strong hadronic vertex; panel (iv) brackets the quark pair forming the pion.}
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