<?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"> PYTHIA is a program for the generation of high-energy physics events, i.e. for the description of collisions at high energies between elementary particles such as e+, e-, p and pbar in various combinations. It contains theory and models for a number of physics aspects, including hard and soft interactions, parton distributions, initial- and final-state parton showers, multiple interactions, fragmentation and decay. It is largely based on original research, but also borrows many formulae and other knowledge from the literature. </longdescription> <use> <flag name="fastjet">Build jets using the <pkg>sci-physics/fastjet</pkg> package</flag> <flag name="hepmc">Adds support for High Energy Physics Monte Carlo Generators <pkg>sci-physics/hepmc</pkg></flag> <flag name="lhapdf">Support the use of external PDF sets via <pkg>sci-physics/lhapdf</pkg></flag> <flag name="root">Use <pkg>sci-physics/root</pkg> trees and histograms (in examples only)</flag> </use> </pkgmetadata>