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Geant4 Simulation Comparison at DHCal Meeting

A detailed comparison of .Mokka vs. .LCDG4 by Guilherme Lima during the DHCal Meeting on Oct. 1st, 2003. Examining Geant version, geometry, physics data, range cuts, and more for accurate results.

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Geant4 Simulation Comparison at DHCal Meeting

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  1. Mokka vs. LCDG4 Comparison Guilherme Lima DHCal Meeting – Oct. 1st, 2003

  2. Comparing apples to apples… • Geant version (4.5.1 in nicadd, 4.5.2 not installed) • Geometry (SDJan03, projective) • Physics list: identical data files (almost) • Range cuts (0.7mm) • No energy thresholds • Geant4 external data files not used (don’t matter) • Text output implemented into projective LCDG4 • Angular distributions (input from file, bad random number generators…): theta = 90deg , flat in phi • Materials (some differences, maybe ok for cals?) • No bugs!!!

  3. Reconstructed energy: 50 GeV e+

  4. Reconstructed energy: 50 GeV pi+

  5. Ecal: Energies per layer

  6. Hcal: energies per layer Problem?

  7. Ecal: energies in absorbers

  8. Hcal: energies in absorbers

  9. Ecal: energies in absorber CELLS

  10. Hcal: energies in absorber CELLS

  11. Ecal: energies per cell Excess!

  12. Hcal: energies per cell Different slopes…

  13. Ecal: number of hits

  14. Hcal: number of hits Thresholds At 700 keV

  15. Number of hits per layer

  16. Cross checking: Ecal+Hcal, abs+cell

  17. Conclusions • Some low-level discrepancies in both ECal and HCal (materials?!) • Discrepancies to Gismo were at much much higher level • Should we go for Geant3 cross checks? • Need better sampling fractions (Vishnu?) • Need to understand peaks at ECal absorbers

  18. Next steps • Still some checks needed for reliable comparisons: • Better random number generator for kinematics • Energy = 50 GeV, not momentum • Make sure materials used are the same • Input from file, for processing exactly same events • Document plots in terms of CVS tags • Investigate origin of discrepancies

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