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PYTHIA 8
Welcome to PYTHIA - The Lund Monte Carlo!
PYTHIA 8 is the successor to PYTHIA 6, rewritten from scratch in C++. At the release of the first public version, 8.100, it was untried and also still missed a few relevant features. This has changed over the years since then, and the release of 8.200 marks the end of a transition period. PYTHIA 8.2 has a significantly extended physics scope, notably for LHC physics, relative to what PYTHIA 6.4 could offer. There are only a few areas left where 6.4 still has a role to fill.
Documentation
On these webpages you will find the up-to-date manual for PYTHIA 8.2. Use the left-hand index to navigate this documentation of program elements, especially of all possible program settings. All parameters are provided with sensible default values, however, so you need only change those of relevance to your particular study, such as choice of beams, processes and phase space cuts. The pages also contain a fairly extensive survey of all methods available to the user, e.g. to study the produced events. What is lacking on these webpages is an overview, on the one hand, and an in-depth physics description, on the other.
The overview can be found in the attached PDF file
An Introduction to PYTHIA 8.2
T. Sjöstrand et al, Comput. Phys.Commun. 191 (2015) 159 [arXiv:1410.3012 [hep-ph]].
You are strongly recommended to read this summary when you start out to learn how to use PYTHIA 8.2.
For the physics description we refer to the complete
PYTHIA 6.4 Physics and Manual
T. Sjöstrand, S. Mrenna and P. Skands, JHEP05 (2006) 026,
which in detail describes the physics (largely) implemented also in PYTHIA 8, and also provides a more extensive bibliography than found here. When you use PYTHIA 8.2, you should therefore cite both.
Furthermore, a separate
PYTHIA 8.2 Worksheet
,
also an attached PDF file, offers a practical introduction to using the generator. It has been developed for and used at a few summer schools, with minor variations, but is also suited for self-study.
Authors
Torbjörn Sjöstrand
Department of Astronomy and Theoretical Physics, Lund University, Sölvegatan 14A, SE-223 62 Lund, Sweden
e-mail: torbjorn@thep.lu.se
Nishita Desai
Laboratoire Charles Coulomb (L2C) & Laboratoire Univers et Particules de Montpellier (LUPM), CNRS-Université de Montpellier, 34090 Montpellier, France
e-mail: nishita.desai@umontpellier.fr
Nadine Fischer
School of Physics, Monash University, PO Box 27, 3800 Melbourne, Australia
e-mail: nadine.fischer@monash.edu
Ilkka Helenius
Insitute for Theoretical Physics, Tuebingen University, Auf der Morgenstelle 14, D-72076 Tuebingen, Germany
e-mail: ilkka.helenius@uni-tuebingen.de
Philip Ilten
Massachusetts Institute of Technology, 77 Massachusetts Ave, Cambridge, MA 02139, USA
e-mail: philten@cern.ch
Leif Lönnblad
Department of Astronomy and Theoretical Physics, Lund University, Sölvegatan 14A, SE-223 62 Lund, Sweden
e-mail: leif.lonnblad@thep.lu.se
Stephen Mrenna
Computing Division, Simulations Group, Fermi National Accelerator Laboratory, MS 234, Batavia, IL 60510, USA
e-mail: mrenna@fnal.gov
Stefan Prestel
Theoretical Physics Department, Fermi National Accelerator Laboratory, MS 106, Batavia, IL 60510, USA
e-mail: sprestel@fnal.gov
Christine O. Rasmussen
Department of Astronomy and Theoretical Physics, Lund University, Sölvegatan 14A, SE-223 62 Lund, Sweden
e-mail: christine.rasmussen@thep.lu.se
Peter Skands
School of Physics, Monash University, PO Box 27, 3800 Melbourne, Australia
e-mail: peter.skands@monash.edu
Former authors
Stefan Ask
, e-mail: ask.stefan@gmail.com
Jesper Roy Christiansen
, e-mail: Jesper.Roy.Christiansen@thep.lu.se
Richard Corke
, e-mail: r.corke@errno.net
Further contributions
Makefiles, configure scripts and HepMC interface by
Mikhail Kirsanov
.
Conversion of XML files to PHP ones by
Ben Lloyd
.
Simple Makefile for Win32/NMAKE by
Bertrand Bellenot
.
Extended Higgs sector partly implemented by
Marc Montull
.
Parts of charm and bottom decay tables courtesy
DELPHI
and
LHCb
collaborations.
Tunes and comparisons with data, based on Rivet and Professor, by
Hendrik Hoeth
.
Text and code on the use of ROOT in conjunction with PYTHIA by
Rene Brun
,
Andreas Morsch
and
Axel Naumann
.
Code and data for MRST/MSTW PDFs by
Robert Thorne
and
Graeme Watt
.
Code and data for the CTEQ/CT PDFs by
Joey Huston
and colleagues.
Help with implementing new proton PDFs by
Tomas Kasemets
.
Code and data for Pomeron PDFs by
H1
collaboration and especially
Paul Newman
.
Help with implementing new Pomeron fluxes and PDFs by
Sparsh Navin
.
The new Hidden Valley code developed together with
Lisa Carloni
.
Code for a Kaluza-Klein electroweak gauge boson provided by
Noam Hod
and
Mark Sutton
.
Code for equivalent photon flux around an unresolved proton by
Oystein Alvestad
.
The MBR diffractive model and central diffraction by
Robert Ciesielski
.
2012 branching ratios for most light hadrons, and the tau lepton, by
Anil Pratap Singh
.
The pythia8-config script has been contributed by
Andy Buckley
, along with many other helpful suggestions.
Code and data for several of the NNPDF2.3 QCD+QED sets provided by
Juan Rojo
and
Stefano Carrazza
.
The fjcore code from FastJet provided by
Matteo Cacciari
,
Gavin Salam
and
Gregory Soyez
.
Note
: in several cases modifications have been made to the original code, in order to integrate it with PYTHIA. In these cases the blame for any mistakes has to rest with the regular authors.
Licence
PYTHIA 8 is licensed under the
GNU General Public Licence version 2
.
Please respect the
MCnet Guidelines
for Event Generator Authors and Users.
The program and the documentation is Copyright © 2017 Torbjörn Sjöstrand