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Question Energy Loss Validation 

Forum: Electromagnetic Processes
Date: 22 May, 2009
From: Tom Roberts <Tom Roberts>

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?

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      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2009/05/22/08.54-94214-Eloss.png

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1 None: Re: Energy Loss Validation   (michel maire - 24 May, 2009)
2 None: Re: Energy Loss Validation   (michel maire - May 26, 02:16)
1 Idea: Re: Energy Loss Validation   (Vladimir Ivanchenko - Jun 12, 10:07)
(_ Note: Re: Energy Loss Validation   (Tom Roberts - Jun 12, 12:27)
(_ None: Re: Energy Loss Validation   (michel maire - Jun 13, 07:31)
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