A comprehensive guide to the physics and usage of PYTHIA 8.3
Bierlich, C., Chakraborty, S., Desai, N., Gellersen, L., Helenius, I., Ilten, P., Lönnblad, L., Mrenna, S., Prestel, S., Preuss, C. T., Sjöstrand, T., Skands, P., Utheim, M., & Verheyen, R. (2022). A comprehensive guide to the physics and usage of PYTHIA 8.3. SciPost Physics Codebases, 2022, Article 8. https://doi.org/10.21468/SciPostPhysCodeb.8
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2022Copyright
© Authors, 2022
This manual describes the Pythia event generator, the most recent version of an evolving physics tool used to answer fundamental questions in particle physics. The program is most often used to generate high-energy-physics collision "events", i.e. sets of particles produced in association with the collision of two incoming high-energy particles, but has several uses beyond that. The guiding philosophy is to produce and re-produce properties of experimentally obtained collisions as accurately as possible. The program includes a wide ranges of reactions within and beyond the Standard Model, and extending to heavy ion physics. Emphasis is put on phenomena where strong interactions play a major role. The manual contains both pedagogical and practical components. All included physics models are described in enough detail to allow the user to obtain a cursory overview of used assumptions and approximations, enabling an informed evaluation of the program output. A number of the most central algorithms are described in enough detail that the main results of the program can be reproduced independently, allowing further development of existing models or the addition of new ones. Finally, a chapter dedicated fully to the user is included towards the end, providing pedagogical examples of standard use cases, and a detailed description of a number of external interfaces. The program code, the online manual, and the latest version of this print manual can be found on the Pythia web page: https://www.pythia.org/.
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Academy Research Fellow, AoF; Research costs of Academy Research Fellow, AoFAdditional information about funding
The Lund and Monash groups have received financial support from the EU H2020 Marie Skłodowska-Curie Innovative Training Network MCnetITN3, grant agreement 722104. The Lund group has also received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme, grant agreement No 668679 (MorePheno), and from the Swedish Research Council, contract number 2016-05996. The Jyväskylä group (IH and MU) has been funded as a part of the CoE in Quark Matter of the Academy of Finland. CB and LL acknowledge support from the Knut and Alice Wallenberg foundation, contract number 2017.0036. SC and LL acknowledge support from the Swedish Research Council, contract number 2020-04869. ND acknowledges support from the Science and Engineering Research Board, Government of India under Ramanujan Fellowship SB/S2/RJN-070. SM is supported by the Fermi Research Alliance, LLC under Contract No. DE-AC02-07CH11359 with the U.S. Department of Energy, Office of Science, Office of High Energy Physics. PS acknowledges support from the Australian Research Council via Discovery Project DP170100708 — “Emergent Phenomena in Quantum Chromodynamics”. RV acknowledges support from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement No. 788223, PanScales), and from the Science and Technology Facilities Council (STFC) under the grant ST/P000274/1. CTP acknowledges support from the Swiss National Science Foundation (SNF) under contract 200021-197130, the Monash Graduate Scholarship, the Monash International Postgraduate Research Scholarship, and the J. L. William Scholarship. IH acknowledges support from the Academy of Finland, project numbers 308301 and 331545, and from the Carl Zeiss Foundation. MU acknowledges support from the Academy of Finland, project number 336419. PI acknowledges support from the United States National Science Foundation (NSF) via grant NSF OAC-2103889. ...License
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