| <?xml version="1.0" encoding="UTF-8"?> |
| <!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd"> |
| <pkgmetadata> |
| <maintainer type="project"> |
| <email>sci-physics@gentoo.org</email> |
| <name>Gentoo Physics Project</name> |
| </maintainer> |
| <longdescription lang="en"> |
| The HepMC package is an object oriented event record written in C++ |
| for High Energy Physics Monte Carlo Generators. Many extensions from |
| HEPEVT, the Fortran HEP standard, are supported: the number of entries |
| is unlimited, spin density matrices can be stored with each vertex, |
| flow patterns (such as color) can be stored and traced, integers |
| representing random number generator states can be stored, and an |
| arbitrary number of event weights can be included. Particles and |
| vertices are kept separate in a graph structure, physically similar to |
| a physics event. The added information supports the modularisation of |
| event generators. The package has been kept as simple as possible with |
| minimal internal/external dependencies. Event information is accessed |
| by means of iterators supplied with the package. |
| |
| Reference: M. Dobbs and J.B. Hansen, Comput. Phys. Commun. 134 (2001)41. |
| </longdescription> |
| <use> |
| <flag name="gev">Build with GeV instead of default MeV for momentum units</flag> |
| <flag name="cm">Build with cm instead of default mm for length units</flag> |
| </use> |
| </pkgmetadata> |