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
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We used to do them with some program by integrating over a hypercube but I haven’t kept up with the numerical work
Interesting .. like doing the wick rotation and then just the 4D integral numerically? Wouldn't the Hypercube be infinite?
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It depends but typically it’s Monte Carlo and you parameterize the phase space by choosing a mapping from the hypercube
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RAMBO and Vegas were used and apparently they still are https://cds.cern.ch/record/444684/files/0006269.pdf …pic.twitter.com/23aVv2TWmK
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