Usage of GEANT 4 versions: 6, 7 & 8 in BABAR
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1 Usage of GEANT 4 versions: 6, 7 & 8 in BABAR Swagato Banerjee Computing in High Energy and Nuclear Physics (CHEP) 4 September 27, Victoria.
2 SLAC-Based B-Factory: PEP II & BABAR The BABAR Detector:
3 Simulation Road Map ] -1 Integrated Luminosity [fb BaBar Run 1-6 PEP II Delivered Luminosity: 494.9/fb BaBar Recorded Luminosity: /fb Off Peak Luminosity: 45.32/fb Delivered Luminosity Recorded Luminosity Off Peak Run4 Run5 As of 27/8/31 : Run6 2 1 Run Run2 22 Run3 23 Year Runs Simulation Production GEANT 4 version SP SP SP1 8.3 Maybe, complete re-simulation (28) for Runs 1-7 with
4 GEANT 4 v7 Highlights Ionization step-size had bug in GEANT 4 v6.1 1 MeV Ionization step-size increased in v6.1 ( G4Bug workaround ) In GEANT v7.1 bug-fixed by GEANT developers (Thanks!) Improvements to Multiple Scattering: Modified Highland formula for the width of the central part Changes in angular distribution of electromagnetic processes Corrections to muon ionization, cross-sections of pair production Hadronic Processes: New implementation of high energy coherent elastic scattering Substantial improvement of angular distributions for heavy materials and large scattering angles. Gheisha Bertini cascade model for k/λ on average parameterization up to 7 body final state Pion cross-sections used in v6.1 out-of-date: table updated from calorimeter beam tests
5 GEANT 4 v8 Highlights Optimized interfaces to Multiple Coulomb Scattering (no step limit) Improved mechanism for hard bremsstrahlung emission (electron recoil in the final state) EM shower shape wider: improve e/π discrimination, π resolution Use improved MIP signature for µ and hadrons (max energy transfer to delta-electrons takes into account hadron size effects: important for ionization of very energetic hadrons) Cross sections of Hadronic Processes: Changed scaling of interpolated pion cross sections from Z 2/3 to A 3/4 (slightly increase interpolated cross section values) Uses improved fits to cross section data for elastic scattering Particle Conventions: updated encoding to match with PDG26. GEANT 4 version 8: Requires CLHEP 1.9 or 2.
6 Tracking: DCH Pseudo Efficiency Small change in PE around 1 MeV: effect of Ionization bug-fix
7 DCH hit residuals : red, : green No significant change -MC -MC Residuals for Momentum < 1 GeV Rediduals for Momentum > 1 GeV
8 SVT hit residuals : red, : green Small improvements -MC -MC Residuals for Momentum < 1 GeV Rediduals for Momentum > 1 GeV
9 µ identification efficiency Entries 3962 Mean Entries RMS Mean Underflow RMS Overflow Underflow 1.44 Overflow 1.15 /MC comparison of efficiency for µ selector with (black) and (red) munntight eff ratio data/sp8 (black) and data/sp9 (red) muons h32r h31r plab Improvements due to updates in multiple scattering
10 EMC Shower Shapes Standalone simulation with BaBar EMC Geometry (T. Koi, SLAC) Comparing average energy deposition with 1 GeV photon (normal incidence) of each CsI among GEANT 4 versions
11 Control Samples for Photons & KLongs Photon shower shape from e + e µ + µ γ events K L shower shape from D + D ( K L π+ π )π + soft decays data KL 15 Sig: Bkg: χ 2 /dof: m = (m - m D ) GeV/c N(IFR)/N(EMC) yeild of B J/ψKL : GEANT 4 v6 : (.51 ±.1) GEANT 4 v7 : (.64 ±.1) GEANT 4 v8 : (.64 ±.1) : (.74 ±.2) D*
12 EMC Shower Shapes (Photons/KLongs) Lateral Moment: Photons 2 KLongs GEANT 4 v7 (v8) is in better agreement with than GEANT 4 v6
13 EMC Shower Shapes (Photons/KLongs) Energy in 1 crystal / Energy in 3x3 matrix: Photons KLongs GEANT 4 v7 (v8) has some improvement over
14 EMC Shower Shapes (Photons/KLongs) Energy in 3x3 matrix / Energy in 5x5 matrix: Photons KLongs GEANT 4 v7 (v8) has some improvement over
15 Summary and Outlook Validation of GEANT 4 has taught us more than expected. /MC improvements noted in µ identification efficiency. Photon shower shape improvement already noted in GEANT 4 v7. More improvement in v8 from multiple scattering π efficiency. Bertini model for Kaons show improvement in GEANT 4 v7 from v6. Not much change in v8 as compared to v7. CLHEP 1.8 to 1.9 migration was necessary for GEANT 4 v8 tests. Re-simulation for Runs 1-7 with GEANT 4 v8 version hopeful.
16 Backup Slides
17 EMC Shower Shapes (Photons/KLongs) Second Moment: Photons KLongs GEANT 4 v7 (v8) has some improvement over
18 EMC Shower Shapes (Photons/KLongs) Zernike Moment 2: Photons 5 KLongs GEANT 4 v7 (v8) has some improvement over
19 EMC Shower Shapes (Photons/KLongs) Zernike Moment 42: Photons 5 KLongs GEANT 4 v7 (v8) has some improvement over
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