2021 (source code)
= 2021
{scope}
{title2=A15272W1}
Source paper: https://www.whatdotheyknow.com/request/oxford_physics_past_papers_2/response/2340696/attach/9/Physics%20Papers%202020.pdf?cookie_passthrough=1
Official standalone paper: https://mmathphys.physics.ox.ac.uk/sites/default/files/mmathphys/documents/media/aqft_2021.pdf
Use <natural units>, the <Minkowski metric> $g=\operatorname{diag}(1,-1,-1,-1)$ and the <Feynman i-epsilon prescription>. In question 1 use <dimensional regularization> with $d=4-2\epsilon$ and write $C_\epsilon=1/(16\pi^2\epsilon)$; in the alternative convention $d=4-\epsilon$, replace $C_\epsilon$ by $1/(8\pi^2\epsilon)$. Only <ultraviolet poles> are retained there. Figure 1 is unreadable in the released source: the corresponding specific gaps are marked below. All other parts have complete derivations.
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