Speaker
Dr
Maria Grazia Pia
(INFN Genova)
Description
A project is in progress for a systematic, quantitative validation of Geant4 physics
models against experimental data.
Due to the complexity of Geant4 physics, the validation of Geant4 hadronic models
proceeds according to a bottom-up approach (i.e. from the lower energy range up to
higher energies): this approach, which is different from the one adopted in the LCG
Simulation Validation Project, allows establishing the accuracy of individual Geant4
models specific to a given energy range on top of already validated models pertinent
to a lower energy.
Results are presented concerning the lower energy hadronic interaction phases: the
nuclear de-excitation and pre-equilibrium (up to 100 MeV).
All relevant Geant4 electromagnetic and hadronic physics models, and pre-packaged
physics configurations distributed by the Geant4 Collaboration (PhysicsLists) have
been included in the validation test. The hadronic models for inelastic scattering
involve Nuclear De-excitation in two variants (default and GEM), Precompound (with or
without Fermi break-up), Bertini and Binary Cascade, and parameterised models.
Elastic scattering includes parameterised models and the newly developed Bertini
Elastic model. Various prepackaged PhysicsLists are also subject to the same
validation process.
The validation is performed against experimental data measured with 2% accuracy. The
quantitative comparison of simulated and experimental data distributions exploits a
rigorous goodness-of-fit statistical analysis.
The final results from high statistics production on the grid are presented: they
compare both the relative accuracy and the execution performance of all the options
considered. These results provide guidance to users about the choice of Geant4
electromagnetic and hadronic physics models.
Primary authors
Anton Lechner
(Tech. Univ. Wien)
Francesco Ri Rosa
(INFN LNS)
Giacomo Cuttone
(INFN LNS)
Giorgio Russo
(INFN LNS)
Dr
Maria Grazia Pia
(INFN Genova)
Pablo Cirrone
(INFN LNS)
