Getting decay chains to work with Pythia8?
I am trying to get decay chains working in Pythia8. If I do this for example:
generate p p > t t~, t > b j j, t~ > b~ l- vl~
output pythia8
I should in theory be able to build and run the pythia code. The problem is that it won't compile because the cross-section inherits from a baseclass called Sigma6Process which doesn't exist in Pythia (it has Sigma2Process and Sigma3Process for 2 -> 2 and 2->3 processes, but of course won't handle higher multiplicity).
Looking at this in more detail, it seems that MadGraph is simply counting the multiplicity in the final state and assigning SigmaNProcess for N final state particles, regardless of whether the chain happened via a succession of 2->2 or 2-> 3 processes.
What am I doing wrong? Is there a way to adjust the syntax to get this working? Using "add process" breaks the output because pythia won't take in generic flavour combinations.
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