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