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Question Re: Relation between physical particles and G4Tracks 

Forum: Event and Track Management
Re: None Relation between physical particles and G4Tracks (Erik Dietz-Laursonn)
Date: 24 Jan, 2017
From: <KL001>

Hello, I am working on a simulation similar to this with a muon in a scintillator. I have read the responses to this question and they were very helpful, but I still have a few unresolved concerns regarding this topic.

I have noticed that when I toggle between opticalPhysics->SetTrackSecondariesFirst true and false for kCerenkov and kScintillation, it drastically changes the later muon interactions. For example, when they are set to "false" there are muPairProduction events in addition to muIoni; however when they are set to "true" there is only muIoni and no pair production.

I expected that the muon interactions should be the same regardless of whether or not secondaries are tracked first. Why does the tracking order affect the physics?

(We are also having other difficulties with missing radiative losses at higher energies; when we plot -dE/dx there is very little rise even at 10 TeV, where we should expect radiative losses to be huge. But perhaps this tracking issue is the first place to start.)

Thank you.

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