| 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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