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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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