1. Mokka vs. LCDG4 Comparison
Guilherme Lima
DHCal Meeting - Sep. 24, 2003

2. Why comparing Mokka and LCDG4?
Previous LCD studies based on Gismo
Geant4-based LCD simulations are rather new, they need to be certified (then Gismo should be dropped)
(LCD)Mokka and LCDG4 were developed independently. Both are based on Geant4, so they should provide compatible results
How about hadron,EM physics? Should we use Geant3 for comparisons?

3. Comparing apples to apples…
Geant version (4.5.1 in nicadd, 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!!!

4. EdepLayer in Ecal: 50GeV e+

5. EdepLayer in Hcal – 50 GeV e+

6. EdepCell in Hcal: 50 GeV mu+

7. EdepLayer in Ecal: 50 GeV mu+

8. EdepLayer in Hcal: 50 GeV mu+

9. Next steps Still some checks needed for reliable comparisons:
Better random number generator for kinematics
Energy = 50 GeV, not momentum
Materials
Input from file, for processing exactly same events
Comparisons for other pions and electrons were not ready in time, left for next week
Document plots in terms of CVS tags
Investigate origin of discrepancies