| 1 | $Id: README,v 1.3 2006/07/05 11:53:02 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 | HepMCEx01 |
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| 9 | --------- |
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| 10 | |
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| 11 | HepMCEx01 is based on ExampleN04, which has a simplified collider detector |
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| 12 | geometry. Only part of the primary generator action is replaced with new one. |
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| 13 | This example demonstrates the following features. |
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| 14 | |
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| 15 | 1. HepMC interface |
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| 16 | |
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| 17 | ExN04PrimaryGeneratorAction has HepMCG4Interface as the generator. |
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| 18 | There are two types of generators provided as samples. One generator reads |
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| 19 | primary information from a HepMC Ascii file (data/example_MyPythia.dat). |
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| 20 | The other one generates primaries directly invoking PYTHIA routines |
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| 21 | in every event. |
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| 22 | |
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| 23 | 2. Readout geometry |
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| 24 | |
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| 25 | ExN04DetectorConstruction defines a simplified collider detecor |
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| 26 | geometry, tracker made of cylindrical tubes, calorimeter made of |
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| 27 | cylindrical tubes, and muon trackers made of planes. |
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| 28 | Cylindrical calorimeter is made of tubes of lead and scintirator |
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| 29 | without cut in phi nor z direction. Energy deposition in scintirator |
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| 30 | is accumulated by ExN04CalorimeterSD sensitive detector, which has |
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| 31 | a readout geometry to find the phi-z cell. |
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| 32 | |
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| 33 | 3. Full set of "ordinary" physics processes |
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| 34 | |
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| 35 | ExN04PhysicsList defines almost all of leptons and hadrons which |
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| 36 | Geant4 has dedicated classes for. Also almost all physics processes |
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| 37 | Geant4 has are defined. |
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| 38 | |
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| 39 | 4. Event filtering by the stacking mechanism. |
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| 40 | |
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| 41 | Higgs events in "pythia_event.data" have two lepton pairs produced |
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| 42 | by the Higgs decay via Z0. At the first stage of each event, only the |
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| 43 | primary muons are tracked without tracking secondaries. then the number |
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| 44 | of hits on the muon trackers are examined. At the next stage, only |
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| 45 | the primary charged particles are tracked only inside the barrel |
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| 46 | tracking area and the isolation of the primary muons are examined. |
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| 47 | At the third stage, all particles in the RoI (Region of Interest) along |
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| 48 | the isolated muons are tracked. All these examinations are applied in |
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| 49 | ExN04StackingAction. |
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| 50 | |
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| 51 | NOTE: it requires the installation of: |
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| 52 | - CERNLIB 2005 and proper access to the "/cern/pro/bin" path included |
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| 53 | in $PATH. |
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| 54 | - HepMC, version 1.27 or greater and proper path defined in $HEPMC_DIR. |
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