how does that differ from regular phase space integration? Having said that, you usually just have to do the integrals yourself since there's a lot of δ functions and step functions.. However doing the Dirac algebra and operator simplification is easy with FeynCalc in MM
Replying to @InertialObservr @litgenstein
Also you'll be needing thispic.twitter.com/7YBLdSGH5m
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