2025 (source code)
= 2025
{scope}
{title2=A15088H1}
Source PDF: https://mmathphys.physics.ox.ac.uk/sites/g/files/vzsiac2991/files/mmathphys/documents/media/a15088h1.pdf
The solutions use <natural units> $\hbar=c=1$ and the <Minkowski metric> $\eta=\operatorname{diag}(1,-1,-1,-1)$. In question 1, $\gamma^5=\gamma^0\gamma^1\gamma^2\gamma^3$ is exactly the paper's convention: it contains no factor $i$. The qualifications in <2/c/iii>, <2/d> and <3/d> distinguish the printed expressions from the results of <charge conservation>, <identical final-state symmetry factors> and <fermionic time ordering>.
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