sci-physics
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.