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arxiv: hep-ph/0603175 · v2 · submitted 2006-03-22 · ✦ hep-ph

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PYTHIA 6.4 Physics and Manual

Peter Skands (Fermilab), Stephen Mrenna (Fermilab), Torbjorn Sjostrand (Lund University)

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classification ✦ hep-ph
keywords physicsprogrameventsinteractionsparticlesproducedpythiaaccurate
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The PYTHIA program can be used to generate high-energy-physics `events', i.e. sets of outgoing particles produced in the interactions between two incoming particles. The objective is to provide as accurate as possible a representation of event properties in a wide range of reactions, within and beyond the Standard Model, with emphasis on those where strong interactions play a role, directly or indirectly, and therefore multihadronic final states are produced. The physics is then not understood well enough to give an exact description; instead the program has to be based on a combination of analytical results and various QCD-based models. This physics input is summarized here, for areas such as hard subprocesses, initial- and final-state parton showers, underlying events and beam remnants, fragmentation and decays, and much more. Furthermore, extensive information is provided on all program elements: subroutines and functions, switches and parameters, and particle and process data. This should allow the user to tailor the generation task to the topics of interest.

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