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0001 \page ExampleHepMCEx01 Example HepMCEx01
0002
0003 HepMCEx01 is based on Example N04, which has a simplified collider detector
0004 geometry. Only part of the primary generator action is replaced with new one.
0005 This example demonstrates the following features.
0006
0007 ## HepMC interface
0008
0009 ExN04PrimaryGeneratorAction has HepMCG4Interface as the generator.
0010 There are two types of generators provided as samples. One generator reads
0011 primary information from a HepMC Ascii file (data/example_MyPythia.dat).
0012 The other one generates primaries directly invoking PYTHIA routines
0013 in every event.
0014
0015 ## Readout geometry
0016
0017 ExN04DetectorConstruction defines a simplified collider detecor
0018 geometry, tracker made of cylindrical tubes, calorimeter made of
0019 cylindrical tubes, and muon trackers made of planes.
0020 Cylindrical calorimeter is made of tubes of lead and scintirator
0021 without cut in phi nor z direction. Energy deposition in scintirator
0022 is accumulated by ExN04CalorimeterSD sensitive detector, which has
0023 a readout geometry to find the phi-z cell.
0024
0025 ## Full set of "ordinary" physics processes
0026
0027 FTFP_BERT physics list defines almost all of leptons and hadrons which
0028 Geant4 has dedicated classes for. Also almost all physics processes
0029 Geant4 has are defined.
0030
0031 ## Event filtering by the stacking mechanism.
0032
0033 Higgs events in "pythia_event.data" have two lepton pairs produced
0034 by the Higgs decay via Z0. At the first stage of each event, only the
0035 primary muons are tracked without tracking secondaries. then the number
0036 of hits on the muon trackers are examined. At the next stage, only
0037 the primary charged particles are tracked only inside the barrel
0038 tracking area and the isolation of the primary muons are examined.
0039 At the third stage, all particles in the RoI (Region of Interest) along
0040 the isolated muons are tracked. All these examinations are applied in
0041 ExN04StackingAction.
0042
0043 ## Installation
0044
0045 See ["eventgenerator/HepMC" page](../../html/Examples_HepMC.html) how to build this example.
0046
0047 ## Execution
0048 ```
0049 % ./HepMCEx01 hepmc_pygen.in
0050 ```
