Hello, I am trying to simulate the collision of two proton beams in the VeLo in LHCb by using Geant4. However, it does not seem possible to interact two beams with each other and so, I was wondering if it is possible to use ions (protons in this case) as target material instead.

Furthermore, I found that PYTHIA 6 (or 8) might offer a solution and I was wondering if anyone has experience in importing PYTHIA package in Geant4, since I cannot find anything helpful in doing this online.

Hopefully someone can help, thanks in advance.

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