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Forum: Hadronic Processes
Re: Question FTFP_BERT in version 10.0 yields worse output than 9.4 for high energies? (Halil)
Date: 22 Apr, 2014
From: Dennis H. Wright <Dennis H. Wright>

There have been many changes in both the FTF and Bertini models since Geant4 9.4. According to your plot, it looks like it is FTF that is affecting you most. Changes that might be responsible for the difference are:

1) interactions of p pi and K on H were tuned to better reproduce data for thin target experiments

2) string mass sampling was changed for baryon-like strings

3) new parameterizations for internal FTF cross sections

4) the Delta-isobar probability was changed.

I'll bring your plot to the attention of the FTF developer in Geant4 as I'm sure it would be of interest to him. In the mean time, if it's not too much trouble, it would be useful to repeat your study with Geant4 9.5, which does not include the above changes. And then repeat with 9.6, which includes 1) through 3).

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1 None: Re: FTFP_BERT in version 10.0 yields worse output than 9.4 for high energies?   (Halil - 08 May, 2014)
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