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Root at the LCD

Root at the LCD. 6/13/2001 M. Iwasaki Univ. of Oregon. North American Linear Collider Detector Group (LCD) has constructed a simulation facility based on Root  LCD Root. So far we only support Linux and SunOS (developing Windows). Event generation at LCD Root.

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Root at the LCD

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  1. Root at the LCD 6/13/2001 M. Iwasaki Univ. of Oregon

  2. North American Linear Collider Detector Group (LCD) has constructed a simulation facility based on Root  LCD Root So far we only support Linux and SunOS (developing Windows)

  3. Event generation at LCD Root • PANDORA-PYTHIA (C++) by M.Peskin •  our main generator • include beam polarization, beamstrahlung • CINT implementation • directly use in C++ interpreter • PYTHIA (TPYTHIA: supported by ROOT) • Output : ROOT or stdHEP (HEPEVT common) • ROOT can go through FastMC • stdHEP can go through FullMC (GISMO) & FastMC • Or can be directly linked to FastMC

  4. Detector Simulation at LCD Root • We use 2 kinds of detector simulations • Fast simulation For physics studies • Full simulation For detector studies • Fast simulation • Smear particle position/energy and IP position • Output Root or is directly linked to Event Analysis • Full simulation (GISMO) • make digitized detector outputs (SIO binary) • Full recon • make tracks and clusters • Output Root or is directly linked to Event Analysis

  5. Detector Simulation at LCD Root HAD Coil HAD EM Coil EM LCD Group considering 3 kinds of Detector designs Silicon, Large, and Precise  Different Detector sizes, materials, and Calorimeter Configurations…. … We prepare 3 kinds of Detector geometry files Detector resolution files (for smearing) Some/all of these parameters can also be changed at user analysis level OR

  6. Event Analysis at LCD Root We have several useful analysis tools for Linear Collider experiments • Jet Finder … 3 kinds of algorithms • Thrust Finder • Particle extrapolator • Topological Vertexing • … translated from SLD ZVTOP

  7. Jet Finder 3 kinds of algorithms .. Jade, Jade E, and Durham Comparison of original Fortran Jet Finder and ours Fortran LCD Root (C++) # of Jets # of Jets (tt 6jets event) Works well!

  8. Thrust Finder tt events ttevents Works well!

  9. Topological vertex finder Translated from SLD ZVTOP Reconstruct secondary vertices in a jet .. Find points of high overlap tracks bBD cD D D B primary primary

  10. Using the reconstructed vertices, we can do 1) Heavy-flavor tagging 2) Charge separation Vertex Mass Vertex Charge For example..

  11. Analysis example with b-tag: Reconstruction of t-quark mass in tt 6jets event Without b-tag With b-tag Signal BG Mass (GeV/c2) Mass (GeV/c2) (FastMC)

  12. LCD Root Event Display FastMC (e+e- ZH)

  13. LCD Root Event Display FullMC (e+e- tt)

  14. Event structure at LCD Root Event Event Header event number … Beam parameters polarization, IP position … Generator level particle information McParticles Raw data (Full) VXDHits TrackerHits CalHits Reconstructed Data Tracks Clusters Based on TClonesArray

  15. Summary • LCD group has constructed simulation/analysis tools • for the future Linear Collider experiments • The simulation/analysis tools based on ROOT •  work well! • LCD Root handles several I/O • … Some of them require STL • (can be worked ROOT V3.00 or later) • There is a LCD Root tutorial page! (Under construction) • URL: • http://www-sldnt.slac.stanford.edu/nld/New/Docs • /LCD_Root/root.htm

  16. Future Plan • GEANT4 • GUI • Support Windows • We are happy to collaborate with • other exp. groups to develop analysis tools!! • ( Currently LCD Root is maintained by 2 people … )

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