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 overview 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, arXiv:0710.3820,
39 to appear in Computer Physics Communications.
40 <br/>You are strongly recommended to read this summary when you
41 start out to learn how to use PYTHIA 8.1.
44 For the physics description we refer to the complete
45 <br/><b>PYTHIA 6.4 Physics and Manual</b>
46 <br/>T. Sjöstrand, S. Mrenna and P. Skands, JHEP05 (2006) 026,
47 <br/>which in detail describes the physics (largely) implemented also in
48 PYTHIA 8, and also provides a more extensive bibliography than found
52 When you use PYTHIA 8.1, you should therefore cite both, e.g. like
53 <br/><b>T. Sjöstrand, S. Mrenna and P. Skands, JHEP05 (2006) 026,
56 <h2>Program Authors and Licence</h2>
59 Main author: <b>Torbjörn Sjöstrand</b><br/>
60 Department of Theoretical Physics, Lund University,
61 SE-223 62 Lund, Sweden<br/>
62 phone: + 46 - 46 - 222 48 16, e-mail: torbjorn@thep.lu.se
65 Author: <b>Stephen Mrenna</b><br/>
66 Computing Division, Simulations Group,
67 Fermi National Accelerator Laboratory,<br/>
68 MS 234, Batavia, IL 60510, USA<br/>
69 phone: + 1 - 630 - 840 - 2556, e-mail: mrenna@fnal.gov
72 Author: <b>Peter Skands</b><br/>
73 CERN/PH, CH-1211 Geneva, Switzerland, and<br/>
74 Theoretical Physics Department,
75 Fermi National Accelerator Laboratory,<br/>
76 MS 106, Batavia, IL 60510, USA<br/>
77 phone: + 41 - 22 - 767 24 59, e-mail: skands@fnal.gov
80 Makefiles, configure scripts and HepMC interface by <b>Mikhail Kirsanov</b>.
81 <br/>Conversion of XML files to PHP ones by <b>Ben Lloyd</b>.
82 <br/>Simple Makefile for Win32/NMAKE by <b>Bertrand Bellenot</b>.
83 <br/>Extended Higgs sector partly implemented by <b>Marc Montull</b>.
84 <br/>Parts of charm and bottom decay tables courtesy <b>DELPHI</b> and
85 <b>LHCb</b> collaborations.
88 PYTHIA 8 is licensed under the
89 <a href="COPYING" target="page"><b>GNU General Public Licence
91 <br/>Please respect the
92 <a href="GUIDELINES" target="page"><b>MCnet Guidelines</b></a>
93 for Event Generator Authors and Users.
96 The program and the documentation is
97 Copyright © 2008 Torbjörn Sjöstrand
102 <!-- Copyright (C) 2008 Torbjorn Sjostrand -->