Srednicki — Quantum Field Theory · Problem 61.2

Canonical Quantization of Scalar Fields — Mark Srednicki

Physics — QFT · scalar-electrodynamics-crossing-symmetry

Problem

Compute ⟨∣T∣2⟩\langle|\mathcal{T}|^2\rangle for the process e~−γ→e~−γ\tilde{e}^-\gamma \to \tilde{e}^-\gamma. You should find that your result is the same as that for e~+e~−→γγ\tilde{e}^+\tilde{e}^- \to \gamma\gamma, but with s↔ts\leftrightarrow t, an example of crossing symmetry.

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