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PYTHIA 6.3 Physics and Manual

Torbjörn Sjöstrand·Leif Lönnblad·Stephen Mrenna·Peter Skands
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Abstract

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, 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, beam remnants and underlying events, 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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Torbjörn Sjöstrand, Leif Lönnblad, Stephen Mrenna, Peter Skands. 2003-08-14. PYTHIA 6.3 Physics and Manual. https://arxiv.org/abs/hep-ph/0308153

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