Griffiths Introduction to Elementary Particles · Problem 7.28

Electrodynamics of Quarks and Hadrons — David J. Griffiths

Physics — QFT · compton-scattering-casimir

Problem

Apply Casimir's trick to obtain an expression analogous to equation (7.124) for Compton scattering. Note that there are four terms here:

|\mathcal{M}|^2 = |\mathcal{M}_1|^2 + |\mathcal{M}_2|^2 + \mathcal{M}_1\mathcal{M}_2^* + \mathcal{M}_1^*\mathcal{M}_2