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| 1 | The HepMC package is an object oriented event record written in C++
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| 2 | for High Energy Physics Monte Carlo Generators. Many extensions from
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| 3 | HEPEVT, the Fortran HEP standard, are supported: the number of entries
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| 4 | is unlimited, spin density matrices can be stored with each vertex,
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| 5 | flow patterns (such as color) can be stored and traced, integers
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| 6 | representing random number generator states can be stored, and an arbitrary
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| 7 | number of event weights can be included. Particles and vertices are kept
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| 8 | separate in a graph structure, physically similar to a physics event.
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| 9 | The added information supports the modularisation of event generators.
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| 10 | The package has been kept as simple as possible with minimal internal/external
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| 11 | dependencies. Event information is accessed by means of iterators supplied
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| 12 | with the package.
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| 14 | Reference: M. Dobbs and J.B. Hansen, Comput. Phys. Commun. 134 (2001) 41.
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| 15 | http://lcgapp.cern.ch/project/simu/HepMC/
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