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Thank you Davide. I hope this clarifies your questions.
> You do not mention what observable you are actually looking at. Are you interested in fragments? Neutrinos? Pions?
At the end, we are interested in the neutrino flux, which depends on how well we model pion production.
> GEANT4 p02. Please let me know if you have any comments or suggestions. I take this to mean Geant4 v10.0.p02. Correct?
I take it back. I just checked my Geant build. It is Geant4 v10.0.p01. Sorry for confusion.
> I'm not sure about this part, so let us wait for someone else to comment on this. Still, it should be fairly straightforward to double-check the 0.5% figure if you know the time of flight of these particles.
The main concern here is we used to have at least a few instances of pi^-/mu^- decay at rest with earlier GEANT4 version (v9.6). Things may have changed between 9.6 and 10.0. GEANT4 v10 release note mentions that muMinusCapture at rest was modified. So I wanted to know a bit more about that aspect. We are too cautious about this because inaccurate modeling of this process may result in significant background.
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