| 1 | $Id: README,v 1.1 2002/03/05 15:22:08 gcosmo Exp $ |
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| 2 | ------------------------------------------------------------------- |
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| 3 | |
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| 4 | ========================================================= |
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| 5 | Geant4 - an Object-Oriented Toolkit for Simulation in HEP |
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| 6 | ========================================================= |
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| 7 | |
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| 8 | ParN04 |
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| 9 | ------ |
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| 10 | |
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| 11 | ParN04 has a simplified collider detector geometry. |
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| 12 | This example demonstrates the following features. |
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| 13 | [ Read 000README for a description of how to run it in parallel. ] |
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| 14 | |
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| 15 | 1. PYTHIA primary events. |
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| 16 | |
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| 17 | ExN04PrimaryGeneratorAction has G4HEPEvtInterface as the generator. |
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| 18 | G4HEPEvtInterface accesses to "pythia_event.data", which contains three |
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| 19 | events of Higgs generation produced by PYTHIA. "pythia_main.f" is an |
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| 20 | example FORTRAN code of PYTHIA for generating this event sample. |
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| 21 | |
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| 22 | 2. Readout geometry |
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| 23 | |
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| 24 | ExN04DetectorConstruction defines a simplified collider detecor |
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| 25 | geometry, tracker made of cylindrical tubes, calorimeter made of |
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| 26 | cylindrical tubes, and muon trackers made of planes. |
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| 27 | Cylindrical calorimeter is made of tubes of lead and scintirator |
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| 28 | without cut in phi nor z direction. Energy deposition in scintirator |
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| 29 | is accumurated by ExN04CalorimeterSD sensitive detector, which has |
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| 30 | a readout geometry to find the phi-z cell. |
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| 31 | |
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| 32 | 3. Full set of "ordinary" physics processes |
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| 33 | |
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| 34 | ExN04PhysicsList defines almost all of leptons and hadrons which |
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| 35 | Geant4 has dedicated classes for. Also almost all physics processes |
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| 36 | Geant4 has are defined. |
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| 37 | |
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| 38 | 4. Event filtering by the stacking mechanism. |
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| 39 | |
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| 40 | Higgs events in "pythia_event.data" have two lepton pairs produced |
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| 41 | by the Higgs decay via Z0. At the first stage of each event, only the |
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| 42 | primary muons are tracked without tracking secondaries. then the number |
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| 43 | of hits on the muon trackers are examined. At the next stage, only |
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| 44 | the primary charged particles are tracked only inside the barrel |
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| 45 | tracking area and the isolation of the primary muons are examined. |
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| 46 | At the third stage, all particles in the RoI (Region of Interest) along |
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| 47 | the isolated muons are tracked. All these examinations are applied in |
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| 48 | ExN04StackingAction. |
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