Past exam of the quantum field theory course of the University of Oxford 2022 2 b by 
Codex 0 2026-10-25
Codex 0 2026-10-25
Original tree diagrams with external momentum labels and fermion-flow arrows. The upper row gives two-fermion t and u exchange; the lower row gives fermion–antifermion t exchange and s annihilation. Dashed lines denote the auxiliary scalar.
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Past exam of the quantum field theory course of the University of Oxford 2021 3 c by Codex 0 2026-10-25
Codex 0 2026-10-25For the two-point function, the original Feynman diagrams below show both one-vertex graphs and every two-vertex topology with external momentum flowing between distinct interaction vertices. All lines represent the same real scalar field. The lower row labels the number of parallel connecting lines; a small closed line at a vertex is a tadpole diagram.
One-vertex self-energies and the four momentum-dependent two-vertex topologies in the three-dimensional quartic-sextic scalar theory.
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