First Comparison HARP with GEANT4 Target Simulations

1
First Comparison HARP with GEANT4 Target
Simulations
UK Neutrino factory Meeting 3 May 2006 Kenny
Walaron, Paul Soler University of Glasgow/RAL
2
Comparison G4/MARS hadronic models

• There were many comparisons of Geant4 and Mars15
  with target simulations
• Problem no good agreement amongst different
  hadronic models of Geant4 and Mars.

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Comparison G4 with HARP

• HARP have published one paper with 12.9 GeV/c
  protons on a 5 LI Aluminium target in forward
  direction (ie.30-210 mrad)
• Developed simulation of HARP target on G4 and
  compared to yields from HARP paper under same
  assumptions
• Caveat so far have neglected reabsorption in
  target but should be 5

Deficit G4 1.5-4 GeV/c
30-60 mrad
60-90 mrad
Very preliminary
4
Comparison G4 with HARP

• HARP have published one paper with 12.9 GeV/c
  protons on a 5 LI Aluminium target in forward
  direction (ie.30-210 mrad)
• Developed simulation of HARP target on G4 and
  compared to yields from HARP paper under same
  assumptions
• Caveat so far have neglected reabsorption in
  target but should be 5

Deficit G4 1.5-4 GeV/c
90-120 mrad
120-150 mrad
Very preliminary
5
Comparison G4 with HARP

• HARP have published one paper with 12.9 GeV/c
  protons on a 5 LI Aluminium target in forward
  direction (ie.30-210 mrad)
• Developed simulation of HARP target on G4 and
  compared to yields from HARP paper under same
  assumptions
• Caveat so far have neglected reabsorption in
  target but should be 5

Deficit G4 1.5-4 GeV/c
150-180 mrad
180-210 mrad
Very preliminary
6
Comparison G4 with HARP

• HARP have published one paper with 12.9 GeV/c
  protons on a 5 LI Aluminium target in forward
  direction (ie.30-210 mrad)
• Developed simulation of HARP target on G4 and
  compared to yields from HARP paper under same
  assumptions
• Caveat so far have neglected reabsorption in
  target but should be 5

Total cross-section vs angle
Total cross-section vs momentum
Very preliminary
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Outlook

• We have started to compare HARP data to GEANT4
• So far, all distributions are very preliminary.
  We have not carried out any cross-checks to
  ensure we are doing things identically to HARP
• Deficit of G4 simulation between 1.5-4 GeV/c
  respect to HARP
• Some differences in total cross-sections that we
  dont understand
• Need to compare to MARS simulations as well.