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Linear Collider Simulation Tools

Explore the tools discussed at the ECFA LC Workshop for designing detectors in linear colliders. Discover the essential requirements and developments in detector simulations for particle physics research.

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Linear Collider Simulation Tools

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  1. Linear Collider Simulation Tools Norman Graf ECFA LC Workshop Durham, Sep. 4, 2004

  2. Detector Requirements • Detectors designed to exploit the physics discovery potential of e+e- collisions at s ~ 1TeV. • Will perform precision measurements of complex final states. • Require: • Exceptional momentum resolution • Excellent vertexing capabilities • “Energy Flow” calorimetry • Hermeticity Norman Graf

  3. Detector Requirements • Yes, but still need to quantify! • Exceptional momentum resolution • is dp/p ~ few 10-5 really necessary! • How important is material? • Excellent vertexing capabilities • What are the effects of inner radius, thickness, number of layers • “Energy Flow” calorimetry • Is 30%/E needed? Can we do better? Norman Graf

  4. Particle Flow Motivation • Measure momenta of charged tracks in the tracker with superb resolution. • Measure photons in highly segmented EM calorimeter with reasonable resolution. • Remaining neutral hadrons measured in hadron calorimeter. Norman Graf

  5. No tool is too simple… Norman Graf

  6. Tracker Resolution Tool lcdtrk • Bruce Schumm has developed a nice tool which allows rapid investigation of tracker designs. • Input is simplified geometry, materials and point resolution. • Output is resolution plots plus covariance matrices which can immediately be used to smear tracks in the fast Monte Carlo. http://www.slac.stanford.edu/~schumm/lcdtrk.tar.gz Norman Graf

  7. Fast MC • Covariantly smears charged tracks. • Smears neutral calorimeter showers by expected resolutions. • Can be used as input for further analyses. • Jet Finding • ZVTop vertexing • Can vary resolutions at analysis time and produce plots of x vs resolution, eff., etc. Norman Graf

  8. MC Event Raw Event G4Application Geometry Geometry Database Reconstruction, Visualization, … LC Detector Full Simulation GEANT4 Norman Graf

  9. LCD Full Simulation • Geometry defined in XML. • Flexible, but simplified volumes. • Projective readout of sensitive volumes. • Dynamic topology, not just parameters. • Have defined generic hit classes for sensitive tracker and calorimeter hits. • LCIO bindings for I/O. Norman Graf

  10. LC Detector Simulations • Use simplified volumes to investigate larger number of designs, allowing dynamic topologies using single executable. • Describe “optimal” detector in detail. TPC Tracker, Si Disks, CCD VTX Norman Graf All Si Tracker, CCD VTX

  11. Reconstruction/Analysis Overview • Java based reconstruction and analysis package • Runs standalone or inside Java Analysis Studio (JAS) • Fast MC • Smeared tracks and calorimetry clusters • Full Reconstruction • track finding and fitting • calorimeter clustering • Individual Particle reconstruction (cluster-track association) • Analysis Tools (including WIRED event display) • Physics Tools (Vertex Finding, Jet Finding, Flavor Tagging) • Beam Background Overlays Norman Graf

  12. hep.lcd Physics Utilities • Physics Utilities • 4-vector, 3-vector classes • Event shape/Thrust finder • Jet Finders • Many kT algorithms implemented (e.g. Jade and Durham ) • Extensible to allow implementation of other algorithms • Event Display • Topological Vertexing • Implementation of SLD’s ZVTOP • Event Generators • Can be run directly in FastMC • Can be run standalone, e.g. for writing stdhep files • Diagnostic Generator • User-defined particle mix, momenta and vertices. • Generator framework extensible for other generators • PYTHIA, HERWIG, ISAJET, … Norman Graf

  13. hep.lcd analysis tools • Tutorial: http://jas.freehep.org/jas3/Tutorial/index.html Norman Graf

  14. Tree controls visibility. (HepRep2 support in WIRED3 is preliminary) Picking supports viewing physics attributes WIRED3 Event Display Norman Graf

  15. Reconstruction Status • Full Reconstruction package which incorporates all aspects of the Particle Flow paradigm, works for any detector, and works out-of-the box is not currently available. • However, many of the pieces are in place, can be used today, & active work is underway to incorporate into a finished product. • See talks in simulation session. Norman Graf

  16. Testing Samples • Testing reconstruction on simple events. Study finding efficiency, fake rates and measurement resolutions (E, p, mass) using: • Single Fundamental Particles • e+/-, , +/-, +/- • Simple Composite Single Particles • 0, , , ,  • Complex Composite Single particles • Z, W • Physics Events Norman Graf

  17. Conclusions • A fairly complete suite of simulation tools exists for LC physics and detector studies. • Contributions to the full reconstruction welcomed and invited, but much can be done within the existing framework with released software. Norman Graf

  18. Norman Graf

  19. Most important tool of all! Norman Graf

  20. Links • LC Simulations: http://lcsim.org • JAS3: http://jas.freehep.org/jas3 • WIRED: http://wired.freehep.org/ • Discussion Forums: • http://forum.linearcollider.org Norman Graf

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