Francesco LongoUniversity of Trieste and INFN-Trieste

After some discussion at Perugia meeting(P.Boinee, R.Rando, R.Giannitrapani, J.Cohen-Tanugi)

Analysis Group 02.06.2003

Validation of G4: status, prospects & discussions

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Setup for the study(F.Longo and J.Cohen Tanugi)

Standalone G4 tests use MC information to retrieve deflection angle between initial and final direction of an normally incident charged track.

Converting Volume is a Tungstene Slab: thin (0.105 mm) and thick (0.723mm)

Projected angle is computed as: arcsin(p_f.x()/p_f.mag())

Test is to compare its distribution to Moliere formula (pdg 26.10),

1 and 10 GeV mu and e-

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MCS status and developments

Note that G4 uses another model than Moliere theory Discrepancy for muons at the 20-24% level in G4.5.1 Contacts with G4 developers at CERN Bug fix in G4.5.2 (ok for muons and protons) For e-? G4 developers model fits well data on e- (low energy) could we give them more data? Using the Moliere theory also for e-?

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G4 physics validation

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G4 physics validation

Koi (SLAC)

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G4 physics validation

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G4 physics validation

Preliminary (not released with G4 5.2)

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G4 validation for DC1 Photon processes

Photoelectric, Compton, Pair production Cross Section Angular Distribution Energy distribution

Charged particle processes Ionisation

Landau, Bethe Bloch Range, Stopping Power, Straggling

Multiple Scattering Projected Angle, Energy dependence

Bremsstrahlung Cross Section, Angular Distribution, Energy Distribution

Delta ray production Energy distribution, Multiplicity

Positron Annihilation Cross section

EM shower profile Mizuno’s thesis confirmation

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G4Validation

Geant4 test and analysis G4 comparison projects:

E.g. ATLAS GLAST validation:

GEANT4TEST package in systests Low level validation on “Gleam level” High level comparison (Baloon, EM, test beam(s), …)

Requirements from Subsystems Statistical methods?