If I have the Lagrangian L=ˉψ(iγμ∂μ−m)ψ−gˉψiγ5ϕψ, where g is a coupling constant.
How to find the scattering amplitude for ϕψ→ϕψ What I only learned in class was electron-electron scattering and electron-proton scattering and can't seem to relate this case above to any of them. I ask only for guidance. Please and thank you!
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