Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2001-08-31
Physics
High Energy Physics
High Energy Physics - Phenomenology
6 + 419 pages
Scientific paper
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. The information in this edition of the manual refers to PYTHIA version 6.200, of 31 August 2001. The official reference to the latest published version is T. Sj\"ostrand, P. Ed\'en, C. Friberg, L. L\"onnblad, G. Miu, S. Mrenna and E. Norrbin, Computer Physics Commun. 135 (2001) 238.
Lonnblad Leif
Mrenna Stephen
Sjostrand Torbjörn
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