Gabriele Cosmo
51 lines
2.0 KiB
Markdown
51 lines
2.0 KiB
Markdown
\page ExampleHepMCEx01 Example HepMCEx01
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HepMCEx01 is based on Example N04, which has a simplified collider detector
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geometry. Only part of the primary generator action is replaced with new one.
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This example demonstrates the following features.
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## HepMC interface
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ExN04PrimaryGeneratorAction has HepMCG4Interface as the generator.
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There are two types of generators provided as samples. One generator reads
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primary information from a HepMC Ascii file (data/example_MyPythia.dat).
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The other one generates primaries directly invoking PYTHIA routines
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in every event.
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## Readout geometry
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ExN04DetectorConstruction defines a simplified collider detecor
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geometry, tracker made of cylindrical tubes, calorimeter made of
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cylindrical tubes, and muon trackers made of planes.
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Cylindrical calorimeter is made of tubes of lead and scintirator
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without cut in phi nor z direction. Energy deposition in scintirator
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is accumulated by ExN04CalorimeterSD sensitive detector, which has
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a readout geometry to find the phi-z cell.
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## Full set of "ordinary" physics processes
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FTFP_BERT physics list defines almost all of leptons and hadrons which
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Geant4 has dedicated classes for. Also almost all physics processes
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Geant4 has are defined.
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## Event filtering by the stacking mechanism.
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Higgs events in "pythia_event.data" have two lepton pairs produced
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by the Higgs decay via Z0. At the first stage of each event, only the
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primary muons are tracked without tracking secondaries. then the number
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of hits on the muon trackers are examined. At the next stage, only
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the primary charged particles are tracked only inside the barrel
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tracking area and the isolation of the primary muons are examined.
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At the third stage, all particles in the RoI (Region of Interest) along
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the isolated muons are tracked. All these examinations are applied in
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ExN04StackingAction.
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## Installation
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See ["eventgenerator/HepMC" page](../../html/Examples_HepMC.html) how to build this example.
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## Execution
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```
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% ./HepMCEx01 hepmc_pygen.in
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```
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