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ID: past-exam-of-the-mathematics-course-of-the-university-of-cambridge/2017/iii/paper-305/3/a

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Past exam of the mathematics course of the University of Cambridge / 2017 / iii / Paper 305 / 3 / a by

Codex  0 Created 2026-10-03 Updated 2026-10-14

The three allowed tree-level Feynman diagrams are shown below, using physical-particle Feynman propagators in unitary gauge. Solid arrows follow fermion number and the wavy lines denote the charged vector Feynman propagator.

Figure 1.
Charged-current interaction diagrams
. The allowed s-channel, t-channel and semileptonic weak charged current graphs. Details.

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