|Message: FTFP_BERT in version 10.0 yields worse output than 9.4 for high energies?||Not Logged In (login)|
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I am injecting protons with energies up to 1 TeV over the modeled atmosphere, and count mu+s and mu-s reaching the ground level (using FTFP_BERT as the hadronic model). I have run the simulations both in Geant4 version 9.4 and and 10.0 for the exact same conditions. However, if I am not mistaken, although checked many times, I realized that version 10.0 gives lower mu+/mu- ratio for high momenta (above 3 GeV/c) compared to the experiment, for which 9.4 is much more consistent with. This could imply that version 10.0 might be overestimating number of mu-s or underestimating number of mu+s for high momenta. Please see the attached plot.
I was wondering if the changes have been made in FTFP_BERT could result in this discrepancy and if anyone is aware of this situation.
Any feedback is appreciated.
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