4 <link rel="stylesheet" type="text/css" href="pythia.css"/>
5 <link rel="shortcut icon" href="pythia32.gif"/>
9 <script language=javascript type=text/javascript>
10 function stopRKey(evt) {
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22 echo "<font color='red'>SETTINGS SAVED TO FILE</font><br/><br/>"; }
24 echo "<font color='red'>NO FILE SELECTED YET.. PLEASE DO SO </font><a href='SaveSettings.php'>HERE</a><br/><br/>"; }
28 <form method='post' action='Frontpage.php'>
32 <h2>Welcome to PYTHIA - The Lund Monte Carlo!</h2>
35 PYTHIA 8 is the successor to PYTHIA 6, rewritten from scratch in C++.
36 With the release of PYTHIA 8.1 it now becomes the official "current"
37 PYTHIA version, although PYTHIA 6.4 will be supported in parallel
38 with it for some time to come. Specifically, the new version has not
39 yet been enough tested and tuned for it to have reached the same level
40 of reliability as the older one. This testing will only happen if
41 people begin to work with the program, however, which is why we
42 encourage a gradual transition to the new version, starting now.
43 There are some new physics features in PYTHIA 8.1, that would make
44 use of it more attractive, but also some topics still missing, where
45 6.4 would have to be used. Further, many obsolete features will not
46 be carried over, so for some backwards compatibility studies again
47 6.4 would be the choice.
49 <h2>Documentation</h2>
51 On these webpages you will find the up-to-date manual for PYTHIA 8.1.
52 Use the left-hand index to navigate this documentation of program
53 elements, especially of all possible program settings. All parameters
54 are provided with sensible default values, however, so you need only
55 change those of relevance to your particular study, such as choice of
56 beams, processes and phase space cuts. The pages also contain a fairly
57 extensive survey of all methods available to the user, e.g. to study
58 the produced events. What is lacking on these webpages is an overview,
59 on the one hand, and an in-depth physics description, on the other.
62 The overview can be found in the attached PDF file
63 <br/><a href="pythia8100.pdf" target="page"><b>A Brief Introduction
65 <br/>T. Sjöstrand, S. Mrenna and P. Skands,
66 Comput. Phys. Comm. 178 (2008) 852 [arXiv:0710.3820].
67 <br/>You are strongly recommended to read this summary when you
68 start out to learn how to use PYTHIA 8.1. Note that some details
69 have changed since the 8.100 version described there.
72 For the physics description we refer to the complete
73 <br/><b>PYTHIA 6.4 Physics and Manual</b>
74 <br/>T. Sjöstrand, S. Mrenna and P. Skands, JHEP05 (2006) 026,
75 <br/>which in detail describes the physics (largely) implemented also in
76 PYTHIA 8, and also provides a more extensive bibliography than found
80 When you use PYTHIA 8.1, you should therefore cite both, e.g. like
81 <br/><b>T. Sjöstrand, S. Mrenna and P. Skands, JHEP05 (2006) 026,
82 Comput. Phys. Comm. 178 (2008) 852</b>.
85 Furthermore, a separate
86 <br/><a href="worksheet.pdf" target="page">
87 <b>PYTHIA 8 Worksheet</b></a>,
88 <br/>also an attached PDF file, offers a practical introduction to
89 using the generator. It has been developed for and used at a few
90 summer schools, with minor variations, but is also suited for
96 <b>Torbjörn Sjöstrand</b><br/>
97 Department of Theoretical Physics, Lund University,
98 Sölvegatan 14A, SE-223 62 Lund, Sweden<br/>
99 phone: + 46 - 46 - 222 48 16, e-mail: torbjorn@thep.lu.se
102 <b>Stefan Ask</b><br/>
103 Department of Physics, University of Cambridge,
104 Cavendish Laboratory, JJ Thomson Ave., Cambridge CB3 0HE, UK<br/>
105 phone: +41 - 22 - 767 6707, e-mail: Stefan.Ask@cern.ch
108 <b>Richard Corke</b><br/>
109 Department of Theoretical Physics, Lund University,
110 Sölvegatan 14A, SE-223 62 Lund, Sweden<br/>
111 phone: + 46 - 46 - 222 31 92, e-mail: richard.corke@thep.lu.se
114 <b>Stephen Mrenna</b><br/>
115 Computing Division, Simulations Group,
116 Fermi National Accelerator Laboratory,
117 MS 234, Batavia, IL 60510, USA<br/>
118 phone: + 1 - 630 - 840 - 2556, e-mail: mrenna@fnal.gov
121 <b>Peter Skands</b><br/>
122 Theoretical Physics, CERN, CH-1211 Geneva 23, Switerland<br/>
123 phone: + 41 - 22 - 767 2447, e-mail: peter.skands@cern.ch
125 <h2>Further contributions</h2>
127 Makefiles, configure scripts and HepMC interface by <b>Mikhail Kirsanov</b>.
128 <br/>Conversion of XML files to PHP ones by <b>Ben Lloyd</b>.
129 <br/>Simple Makefile for Win32/NMAKE by <b>Bertrand Bellenot</b>.
130 <br/>Extended Higgs sector partly implemented by <b>Marc Montull</b>.
131 <br/>Parts of charm and bottom decay tables courtesy <b>DELPHI</b> and
132 <b>LHCb</b> collaborations.
133 <br/>Tunes and comparisons with data, based on Rivet and Professor,
134 by <b>Hendrik Hoeth</b>.
135 <br/>Text and code on the use of ROOT in conjunction with PYTHIA
136 by <b>Rene Brun</b> and <b>Andreas Morsch</b>.
137 <br/>Code and data for MRST/MSTW PDFs by <b>Robert Thorne</b> and
139 <br/>Code and data for the CTEQ/CT PDFs by <b>Joey Huston</b>
141 <br/>Help with implementing new proton PDFs by <b>Tomas Kasemets</b>.
142 <br/>Code and data for Pomeron PDFs by <b>H1</b> collaboration and
143 especially <b>Paul Newman</b>.
144 <br/>Help with implementing new Pomeron fluxes and PDFs by <b>Sparsh Navin</b>.
145 <br/>The new Hidden Valley code developed together with <b>Lisa Carloni</b>.
146 <br/>Code for a Kaluza-Klein electroweak gauge boson provided by
147 <b>Noam Hod</b> and <b>Mark Sutton</b>.
148 <br/>Code for equivalent photon flux around an unresolved proton by
149 <b>Oystein Alvestad</b>.
150 <br/>Part of the SUSY code by <b>Nishita Desai</b>.
151 <br/><b>Note</b>: in several cases modifications have been made to
152 the original code, in order to integrate it with PYTHIA. In these cases
153 the blame for any mistakes has to rest with the regular authors.
157 PYTHIA 8 is licensed under the
158 <a href="COPYING" target="page"><b>GNU General Public Licence
160 <br/>Please respect the
161 <a href="GUIDELINES" target="page"><b>MCnet Guidelines</b></a>
162 for Event Generator Authors and Users.
165 The program and the documentation is
166 Copyright © 2010 Torbjörn Sjöstrand
172 <!-- Copyright (C) 2010 Torbjorn Sjostrand -->