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Question Difference in longitudinal shower profile between LHEP_EMY and QGSP_BERT_EMY 

Forum: Hadronic Processes
Date: 30 Aug, 2012
From: Leif Raedel <Leif Raedel>

Hi everyone,

I try to understand a difference in the longitudinal shower profile of hadronic cascades for different hadronic models.

In my simulation I shoot a pi+ into a block of ice and then just histogram the track length of all charged particles as a function of the shower depth.

The result is shown in the attached plots, for initial energies of 1TeV and 10TeV. Now, one can clearly see the difference between the QGSP model and the LHEP model near the end of the cascade. I cannot understand where this feature comes from. I checked if these are due to muons produced in the shower which is not the case. Also I checked what kind of particles reach this far in a shower and these are electron from compton scattering.

This doesn't make sense in my opinion because if there are photons with such a range why are the only present in the LHEP model and not in QGSP?

Does someone have an idea where this effect comes from?

Thanks a lot! Cheers, Leif

   Attachment:
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2012/08/30/04.16-97792-dldz_1000GeV.png
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2012/08/30/04.16-62739-dldz_10000GeV.png

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1 None: Re: Difference in longitudinal shower profile between LHEP_EMY and QGSP_BERT_EMY   (Dennis H. Wright - 06 Sep, 2012)
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