4 <link rel="stylesheet" type="text/css" href="pythia.css"/>
5 <link rel="shortcut icon" href="pythia32.gif"/>
11 <h2>Welcome to PYTHIA - The Lund Monte Carlo!</h2>
14 PYTHIA 8 is the successor to PYTHIA 6, rewritten from scratch in C++.
15 With the release of PYTHIA 8.1 it now becomes the official "current"
16 PYTHIA version, although PYTHIA 6.4 will be supported in parallel
17 with it for some time to come. Specifically, the new version has not
18 yet been enough tested and tuned for it to have reached the same level
19 of reliability as the older one. This testing will only happen if
20 people begin to work with the program, however, which is why we
21 encourage a gradual transition to the new version, starting now.
22 There are some new physics features in PYTHIA 8.1, that would make
23 use of it more attractive, but also some topics still missing, where
24 6.4 would have to be used. Further, many obsolete features will not
25 be carried over, so for some backwards compatibility studies again
26 6.4 would be the choice.
28 <h2>Documentation</h2>
30 On these webpages you will find the up-to-date manual for PYTHIA 8.1.
31 Use the left-hand index to navigate this documentation of program
32 elements, especially of all possible program settings. All parameters
33 are provided with sensible default values, however, so you need only
34 change those of relevance to your particular study, such as choice of
35 beams, processes and phase space cuts. The pages also contain a fairly
36 extensive survey of all methods available to the user, e.g. to study
37 the produced events. What is lacking on these webpages is an overview,
38 on the one hand, and an in-depth physics description, on the other.
41 The overview can be found in the attached PDF file
42 <br/><a href="pythia8100.pdf" target="page"><b>A Brief Introduction
44 <br/>T. Sjöstrand, S. Mrenna and P. Skands,
45 Comput. Phys. Comm. 178 (2008) 852 [arXiv:0710.3820].
46 <br/>You are strongly recommended to read this summary when you
47 start out to learn how to use PYTHIA 8.1. Note that some details
48 have changed since the 8.100 version described there.
51 For the physics description we refer to the complete
52 <br/><b>PYTHIA 6.4 Physics and Manual</b>
53 <br/>T. Sjöstrand, S. Mrenna and P. Skands, JHEP05 (2006) 026,
54 <br/>which in detail describes the physics (largely) implemented also in
55 PYTHIA 8, and also provides a more extensive bibliography than found
59 When you use PYTHIA 8.1, you should therefore cite both, e.g. like
60 <br/><b>T. Sjöstrand, S. Mrenna and P. Skands, JHEP05 (2006) 026,
61 Comput. Phys. Comm. 178 (2008) 852</b>.
64 Furthermore, a separate
65 <br/><a href="worksheet.pdf" target="page">
66 <b>PYTHIA 8 Worksheet</b></a>,
67 <br/>also an attached PDF file, offers a practical introduction to
68 using the generator. It has been developed for and used at a few
69 summer schools, with minor variations, but is also suited for
75 <b>Torbjörn Sjöstrand</b><br/>
76 Department of Astronomy and Theoretical Physics, Lund University,
77 Sölvegatan 14A, SE-223 62 Lund, Sweden<br/>
78 phone: + 46 - 46 - 222 48 16, e-mail: torbjorn@thep.lu.se
81 <b>Stefan Ask</b><br/>
82 Department of Physics, University of Cambridge,
83 Cavendish Laboratory, JJ Thomson Ave., Cambridge CB3 0HE, UK<br/>
84 phone: +41 - 22 - 767 6707, e-mail: Stefan.Ask@cern.ch
87 <b>Richard Corke</b><br/>
88 Niels Bohr Institute, University of Copenhagen, Blegdamsvej 17,
89 2100 Copenhagen, Denmark<br/>
90 e-mail: richard.corke@thep.lu.se
93 <b>Stephen Mrenna</b><br/>
94 Computing Division, Simulations Group,
95 Fermi National Accelerator Laboratory,
96 MS 234, Batavia, IL 60510, USA<br/>
97 phone: + 1 - 630 - 840 - 2556, e-mail: mrenna@fnal.gov
100 <b>Stefan Prestel</b><br/>
101 Department of Astronomy and Theoretical Physics, Lund University,
102 Sölvegatan 14A, SE-223 62 Lund, Sweden<br/>
103 phone: + 46 - 46 - 222 06 64, e-mail: stefan.prestel@thep.lu.se
106 <b>Peter Skands</b><br/>
107 Theoretical Physics, CERN, CH-1211 Geneva 23, Switerland<br/>
108 phone: + 41 - 22 - 767 2447, e-mail: peter.skands@cern.ch
110 <h2>Further contributions</h2>
112 Makefiles, configure scripts and HepMC interface by <b>Mikhail Kirsanov</b>.
113 <br/>Conversion of XML files to PHP ones by <b>Ben Lloyd</b>.
114 <br/>Simple Makefile for Win32/NMAKE by <b>Bertrand Bellenot</b>.
115 <br/>Extended Higgs sector partly implemented by <b>Marc Montull</b>.
116 <br/>Parts of charm and bottom decay tables courtesy <b>DELPHI</b> and
117 <b>LHCb</b> collaborations.
118 <br/>Tunes and comparisons with data, based on Rivet and Professor,
119 by <b>Hendrik Hoeth</b>.
120 <br/>Text and code on the use of ROOT in conjunction with PYTHIA
121 by <b>Rene Brun</b>, <b>Andreas Morsch</b> and <b>Axel Naumann</b>.
122 <br/>Code and data for MRST/MSTW PDFs by <b>Robert Thorne</b> and
124 <br/>Code and data for the CTEQ/CT PDFs by <b>Joey Huston</b>
126 <br/>Help with implementing new proton PDFs by <b>Tomas Kasemets</b>.
127 <br/>Code and data for Pomeron PDFs by <b>H1</b> collaboration and
128 especially <b>Paul Newman</b>.
129 <br/>Help with implementing new Pomeron fluxes and PDFs by <b>Sparsh Navin</b>.
130 <br/>The new Hidden Valley code developed together with <b>Lisa Carloni</b>.
131 <br/>Code for a Kaluza-Klein electroweak gauge boson provided by
132 <b>Noam Hod</b> and <b>Mark Sutton</b>.
133 <br/>Code for equivalent photon flux around an unresolved proton by
134 <b>Oystein Alvestad</b>.
135 <br/>Part of the SUSY code by <b>Nishita Desai</b>.
136 <br/>Tau decays with decay models and helicity information by
138 <br/>The MBR diffractive model and central diffraction by
139 <b>Robert Ciesielski</b>.
140 <br/><b>Note</b>: in several cases modifications have been made to
141 the original code, in order to integrate it with PYTHIA. In these cases
142 the blame for any mistakes has to rest with the regular authors.
146 PYTHIA 8 is licensed under the
147 <a href="COPYING" target="page"><b>GNU General Public Licence
149 <br/>Please respect the
150 <a href="GUIDELINES" target="page"><b>MCnet Guidelines</b></a>
151 for Event Generator Authors and Users.
154 The program and the documentation is
155 Copyright © 2012 Torbjörn Sjöstrand
161 <!-- Copyright (C) 2012 Torbjorn Sjostrand -->