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Francesco Longo University of Trieste and INFN-Trieste After some discussion at Perugia meeting

Validation of G4: status, prospects & discussions. Francesco Longo University 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. Setup for the study (F.Longo and J.Cohen Tanugi).

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Francesco Longo University of Trieste and INFN-Trieste After some discussion at Perugia meeting

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  1. Validation of G4: status, prospects & discussions Francesco Longo University 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

  2. 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-

  3. 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-?

  4. G4 physics validation

  5. G4 physics validation Koi (SLAC)

  6. G4 physics validation

  7. G4 physics validation Preliminary (not released with G4 5.2)

  8. 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

  9. 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?

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