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Simple benchmarks Final remarks on pion absorption

Simple benchmarks Final remarks on pion absorption. Witek Pokorski. Outline. short reminder on the setup validation/comparison plots conclusion. Pion absorption benchmark. (see talk given on 3 rd of March 2004 at the Physics Validation meeting)

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Simple benchmarks Final remarks on pion absorption

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  1. Simple benchmarks Final remarks on pion absorption Witek Pokorski Simulation Project

  2. Outline • short reminder on the setup • validation/comparison plots • conclusion Simulation Project

  3. Pion absorption benchmark • (see talk given on 3rd of March 2004 at the Physics Validation meeting) • general idea: thin target (Al,Cu,Au) experiment to study individual pion-nucleus process • experimental data • K. Nakai at al., PRL 44, 1446 (1980) • D. Ashery et al, PR C23, 2173 (1991) • simulation • G4 setup initially developed by Isidro Gonzalez (Alice) • ‘fake’ thin target experiment – large block of material, tracking stopped as soon as a process occurs • using QGSP_BERT physics list • Fluka ‘bypass’ provided by Alfredo Ferrari • using the new parametrisation based on the internal Fluka model Simulation Project

  4. Total inelastic cross section Simulation Project

  5. G4: Au cross section table corrected G4.6.1 G4.6.2 G4.6.2 G4.6.1 Simulation Project

  6. Absorptive part for pi+ Simulation Project

  7. Absorption Xsection for pi+ • both G4 and Fluka show reasonable agreement • in some cases Fluka seems to be a bit better • difficult to make more conclusions because of big uncertainties in the experimental data Simulation Project

  8. Absorptive part for pi- Simulation Project

  9. Absorption Xsection for pi- • same remarks as for pi+ • for heavy material (Au) the shape of the QGSP_BERT quite different (?) • G4: best agreement for ‘medium-weight’ materials Simulation Project

  10. Particle spectra for pi+ on Al Simulation Project

  11. Particle spectra for pi+ on Cu Simulation Project

  12. Particle spectra for pi+ on Au Simulation Project

  13. Particle spectra for pi- on Al Simulation Project

  14. Particle spectra for pi- on Cu Simulation Project

  15. Particle spectra for pi- on Au Simulation Project

  16. Summary • Both Geant4 and Fluka results show reasonable agreement between simulation and experimental data • In some cases Fluka seems to be a bit better than G4 with QGSP_BERT, but hard to judge because of big uncertainties in the experimental data • BUT: how well do we need to reproduce that data???? • bug corrected in G4 cross section tables • additional motivation for Fluka to move to the new parametrisation • LCG note on pion absorption benchmark in preparation Simulation Project

  17. Fluka parametrisations (1/2) Simulation Project

  18. Fluka parametrisation (2/2) Simulation Project

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