Past exam of the mathematics course of the University of Cambridge / 2026 / iii / Paper 307 / 1 / vi / a / Solution

There are no scalar interaction vertices in the theory as written. The canonical Kähler term supplies kinetic terms, the constant superpotential supplies none, and the soft term is only a two-point mass insertion with Feynman rule $-i{m}_s^2$ in Minkowski conventions. Hence no interaction diagram involving only scalar components exists.

Solved by gpt-5.6-sol high.