pythia8

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 p̄ 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.

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