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Report to Simulation Meeting

Report to Simulation Meeting. 20 May, 2004 Akiya Miyamoto, KEK. Jupiter. : Geant4 based Full Detector Simulator. Features: Modular structure for easy update, install/uninstall of sub-detectors Powerful base classes that provide unified interface to

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Report to Simulation Meeting

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  1. Report to Simulation Meeting 20 May, 2004 Akiya Miyamoto, KEK

  2. Jupiter : Geant4 based Full Detector Simulator • Features: • Modular structure for easy update, install/uninstall of sub-detectors • Powerful base classes that provide unified interface to • facilitate easy (un)installation of components by methods such as InstallIn, Assemble, Cabling • Help implementation of detailed hierarchiral structures. This helps to save memory size. • Minimize user-written source code by • Automatic naming system & material management • B-field compositions for accelerators • Input: HEPEVT, CAIN (ASCII) or generators in JSF. • Output • Output class allows extrnal methods. Using this mechanism, it can output ASCII flat file and JSF/ROOT fie. Core developper: K.Hoshina and K.Fujii

  3. Standard Geometry of Jupiter Super Conducting Solenoid (SOL) Calorimeter(HCAL) Calorimeter(ECAL) Central Tracker(CDC) Intermediate Tracker(IT) Vertex Detector(VTX)

  4. Detector geometries in Jupiter CDC Individual drift cells and wires Axial and stereo geometry VTX detector VTX sensor IT Geometry parameters such as #layers, #pixels,…. controled by a ParameterList class for easy modification 0cm 45cm 155cm

  5. Beam Delivery System for Beam BG Study T.Aso Crossing 3mrad Detector Model Model d) L*=4.3 m 3T (Solenoid) CDC QC1 QC1 VTX QC2 VTX

  6. Sample events by Jupiter Beam Background Simulated By Jupiter Event source : CAIN

  7. Jupiter and JSFJ4 • JSFJ4 is a Jupiter-JSF interface

  8. Jupiter Commponents • Jupiter1)Framework 1-1)LCIO 1-2)Geometry Management2)Component (Red letter was established component) 2-1)IR 2-2)VTX 2-3)CT <- Jet                   (TPC) 2-4)IT+FT 2-5)Cal <- Spherical model (Tower/2parts, Tile?)                   More realistic model (Tile, Strip)                   Digital model 2-6)Mag(Simple Solenoid) 2-7)Muon+Return Yoke

  9. For Jet mass reconstruction • Following packages are required for jet mass reconstruction • Track reconstruction • Central Tracker track finder and fitter • Link Central Tracker and IT/VTX for refitting • Track extrapolation to CAL • Cal reconstruction • Two algorithm • (a) Cal clustering • EM clustering -> EMC-Track Match -> e/gamma ID -> mu-ID -> HD clustering -> HDC-Track Match -> Neutral Particle • (b) Track based clustering • Remove Charged track energy from cell -> muID -> EM Clustering -> HD Clustering • Jet Clustering • Vertexing and heavy quark tagger Develop them in parallel, not serially

  10. Study items and works to do • Implement CAL geometries • Spherical, cylindrical, realistic with tilt and gaps • For spherical, 5x5mm2, Pb 8mm, Sci. 2mm or Pb 4mm, Sci 1mm (?) • Single particle performances • Linearity, resolution, lateral/longitudinal spread • Caliburation and optimum cut values • How strongly these performances depend on geometries • Two-particle or jet performance • Develop clustering algorithm • Study electron/gamma ID performance • Study pi+/n ID performance Study dependences on detector geometry and parameters

  11. Study items - 2 • Jet reconstruction • Masses of W, Z, H, T …. Which process ? ee-> ZH->nnH @ 250GeV or WW->enW @500GeV or ee-> ZZ->nnqq @ 500 or 1000 GeV • Energy and direction of jets • Background rejection • Off timing mini-jet tracks • Muon from upstream

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