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Forum: Electromagnetic Processes
Re: Question Energy Loss Validation (Tom Roberts)
Date: 24 May, 2009
From: michel maire <michel maire>

On Fri, 22 May 2009 16:20:46 GMT, Tom Roberts wrote:
> As a basic test of energy loss in Geant4 9.2.p01, I ran a series of
> simulations that measure the energy loss of mu+ on Cu, reproducing fig.
> 27.1 of the PDG book (attached). The red dots are the simulation using
> QGSP_BERT with Decay disabled. Each point is a separate run, with each
> thickness of the Cu absorber adjusted so <KEout/KEin> is in the range
> 0.95-0.96; there are 10,000 mu+ in each point, so the errorbars are
> smaller than the dots.
> 
> Agreement is excellent below about 200 GeV/c, all the way down to 0.1
> MeV/c (48 eV kinetic energy, beta=0.001). This is a comparison of
> models, not any experiment. Does anyone know which model is better or
> more believable above ~200 GeV/c?

  See
 http://vnivanch.web.cern.ch/vnivanch/verification/verification/electromagnetic/em5.tramu

 this is done with TestEm5, macro tramu.mac ('data'in subdirectory tramu)

     Michel

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