Srednicki — Quantum Field Theory · Problem 61.1

Canonical Quantization of Scalar Fields — Mark Srednicki

Physics — QFT · scalar-electrodynamics-compton-scattering

Problem

Compute

\langle|\mathcal{T}|^2\rangle

for

\tilde{e}^+\tilde{e}^- \to \gamma\gamma

, and express your answer in terms of the Mandelstam variables.