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| 2 | Examples for HepMC-Geant4 interface
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| 3 | -----------------------------------
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| 4 |
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| 5 | This directory contains examples for using HepMC as an interface with
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| 6 | various Monte Carlo event generators, such as PYTHIA.
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| 7 | It also include an example for demonstrating MC truth handling with HepMC.
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| 8 |
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| 9 | Requirements for external software packages
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| 10 | -------------------------------------------
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| 11 | HepMC:
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| 12 | tested version : 1.27.02
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| 13 | http://lcgapp.cern.ch/project/spi/extsoft/packages.php?pkg=HepMC
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| 14 | http://cern.ch/mdobbs/HepMC/
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| 15 |
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| 16 | Note: examples were tested only on Linux with gcc.
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| 17 |
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| 18 | PYTHIA
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| 19 | Tested version 6.205 (CERNLIB 2005)
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| 20 | URL: http://www.thep.lu.se/~torbjorn/Pythia.html
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| 21 |
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| 22 |
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| 23 | Examples HepMCEx01 and HepMCEx02
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| 24 | ================================
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| 25 |
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| 26 | class HepMCG4Interface
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| 27 | This class is derived from G4VPrimaryGenerator, and is a base class
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| 28 | for primary generation via HepMC object.
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| 29 |
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| 30 | protected members
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| 31 | + virtual HepMC::GenEvent* GenerateHepMCEvent()
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| 32 | Implement this method in his/her own concrete class.
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| 33 | An empty event will be created in default.
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| 34 |
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| 35 | + void HepMC2G4(const HepMC::GenEvent* hepmcevt, G4Event* g4event)
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| 36 | service method for conversion from HepMC::GenEvent to G4Event
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| 37 |
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| 38 | + virtual G4bool CheckVertexInsideWorld(const G4ThreeVector& pos) const
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| 39 | We have to take care for the position of primaries because
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| 40 | primary vertices outside the world volume give rise to G4Exception.
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| 41 | If the default implementation is not adequate, an alternative
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| 42 | can be implemented in your own class.
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| 43 |
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| 44 | public members
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| 45 | + virtual void GeneratePrimaryVertex(G4Event* anEvent)
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| 46 | The default behavior is that a single HepMC event generated by
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| 47 | GenerateHepMCEvent() will be converted to G4Event through HepMC2G4().
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| 48 |
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| 49 | class HepMCG4AsciiReader / HepMCG4AsciiReaderMessenger
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| 50 | (derived from HepMCG4Interface)
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| 51 | This derived class is for reading primary information from
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| 52 | an Ascii file generated by HepMC.
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| 53 |
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| 54 | class HepMCG4PythiaInterface / HepMCG4AsciiReaderMessenger
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| 55 | (derived from HepMCG4Interface)
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| 56 | This derived class is for directly calling PYTHIA functions.
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| 57 | Users can set parameters, initialize, generate, and terminate
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| 58 | by command line operation.
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| 59 |
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| 60 | Macros in examples
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| 61 | -----------------
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| 62 | hepmc_pygen.in
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| 63 | process PYTHIA events(H->4mu) generated at every event.
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| 64 |
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| 65 | hepmc_ascii.in
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| 66 | read pregenerated events from HepMC Ascii file (data/example_MyPhyia.dat).
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| 67 |
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| 68 | How to compile
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| 69 | --------------
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| 70 | To build HepMCEx01 and HepMCEx02 examples, the directory path where the
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| 71 | HepMC package is installed must be provided through the variable HEPMC_DIR.
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| 72 | PYTHIA 6.205 must be installed through CERNLIB 2005 and the bin path
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| 73 | correctly added in PATH.
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| 74 |
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| 75 | Notes
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| 76 | -----
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| 77 | We attached a sample HepMC Ascii data file, "data/example_MyPhyia.dat",
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| 78 | which contains 10 PYTHIA events created by "data/example_MyPythia.cxx(cc)".
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| 79 |
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| 80 | Example MCTruth
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| 81 | ===============
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| 82 |
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| 83 | Application demonstrating handling of Monte-Carlo truth information through
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| 84 | the HepMC package.
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