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BESIII Monte Carlo Release Notes & Planned Development

Detailed overview of the BESIII HEP software frame, architecture, and modules, covering simulation, reconstruction, calibration, analysis tools, and performance. Includes release notes for sub-detectors and common parts. Future developments like new geometries, magnetic field optimization, interaction packages, and background/triggers simulations are outlined. Performance metrics on lxplus and planned improvements are discussed.

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BESIII Monte Carlo Release Notes & Planned Development

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  1. BESIII MCRelease notes & planned developmentDengzy, Hem, Liuhm, Youzy, YuanyNov. 23, 2005

  2. What to cover? • Retrospect • Release notes • Performance • Planned development

  3. HEP Software FrameArchitecture and modules are now exp. dependentSIM: Fluka, Gheisha, …, G3, G4REC: Cleo, Belle, BaBarANA: Paw, Aida, … RootArchitecture: Basf, Root, Cobra, Gaudi

  4. physics e+ e- generator event tracking MC detector hit digitization digit data design reconstruction track MC efficiency analysis signal background

  5. BOOST Project BESIII Object Oriented Simulation Tool (proposal: August, 2002) BES MC Software Evolution BESI BESII BESIII SOBER SIMBES BOOST EGS G3 G4 1980s 1990s 2000s

  6. BOOST: 3 phases Phase 1: Framework prototype, simple geometry with hit Finished in May 2003 Phase 2: Detailed BESIII detector with simple digitization Finished in May 2004, digit outputs can be used to tune the reconstruction program Phase 3: Detailed digitization, data/MC comparisons Need information from beam test and data. We are here!

  7. BESIII offline software • Simulation: mimic experiment, as close as real • Reconstruction: retrieve physics quantities from data • Calibration: make possible corrections to data • Framework: provide common services to all modules • AnalysisTool: make physics analysis easier

  8. Release notes (sub-detectors) • MDC Geometry: small overlap detected, and corrected, dead-loop in tracking eliminated new MDC geometry passed test Digitization: wire resolution using two gaussians momentum resolution turns a bit smaller MCtruth: add more information, like LR ambiguity

  9. Release notes (sub-detectors) • TOF Geometry: new barrel double-layer structure, scintillator wrapper added end-cap TOF extruding problem solved Digitization: full detector response as default

  10. Release notes (sub-detectors) • EMC Geometry: support structure (cables) added Digitization: electronic noise added • MUC Geometry : using new alignment data

  11. Release notes (common parts) • Magnetic field Geant4 default parameters (step size, intersection) reused Momentum resolutions are ok for leptons and hadrons • Physics interaction BesPhysicsList: not stable for hadrons Geant4 recommended packages are used

  12. Release notes (common parts) • GDML (XML) Rewrite MUC & TOF, can be shared by REC MDC & EMC remain unchanged Use code to build BESIII detector in this release

  13. Performance (on lxplus) • Simulation speed Depends on event type Using Tester, Bhabha, Dimuon, Hadronic, inclusive J/Psi events Geant4.7.0 (BOSS), Geant4.7.1 (BOOST) CPU time, roughly, 1 second for one event No crash/dead-loop for about 50K events

  14. Performance (on lxplus) • Memory consumption Roughly 80M memory needed About 4M memory leak for 10K events Memory leak depends on particle type, mainly comes from G4 interaction packages

  15. Performance (on lxplus) • Physics quantities Key physics quantities/parameters checked momentum/time/energy resolutions, reconstruction efficiencies, … Satisfactory & understandable So far so good

  16. Planned development • Geometry – 12/2005 New EMC & MDC description • Magnetic field – 02/2006 3D field map in the whole detector propagation parameters optimization • Interaction packages – 12/2005 Different hadronic packages Standard and Low EM packages

  17. Planned development • Background simulation – 06/2006? Bianjg is working on it • Trigger simulation – 12/2006? Caogf will work on it • Move to new G4 and GDML – 01/2006? Gean4.7.1  Geant4.7.2 (12/2005) GDML1.0  GDML2.3.0 (08/2005)

  18. Planned development • Real detector simulation – 10/2006? Rethink about BESII scheme Using Calibration constants? Wire resolution/ efficiency, dead/hot channels, … • MCtruth binary output – 03/2006? Needed to save space • Detector response – 11/2005 … Long-term work

  19. If you have problem … • Judge before shouting Correct environment? Correct cards? Am I right? • Report to developers Crash? Dead-loop? Abnormity? • Discuss with experts Hard-to-understand resluts

  20. What is MC? doing experiment in computer 纸上谈兵 运筹帷幄 决胜千里

  21. Thank you!

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