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<h1>PYTHIA 8</h1>

<h2>Welcome to PYTHIA - The Lund Monte Carlo!</h2>

<p/>
PYTHIA 8 is the successor to PYTHIA 6, rewritten from scratch in C++. 
With the release of PYTHIA 8.1 it now becomes the official "current" 
PYTHIA version, although PYTHIA 6.4 will be supported in  parallel 
with it for some time to come. Specifically, the new version has not 
yet been enough tested and tuned for it to have reached the same level 
of reliability as the older one. This testing will only happen if 
people begin to work with the program, however, which is why we 
encourage a gradual transition to the new version, starting now. 
There are some new physics features in PYTHIA 8.1, that would make 
use of it more attractive, but also some topics still missing, where 
6.4 would have to be used. Further, many obsolete features will not 
be carried over, so for some backwards compatibility studies again 
6.4 would be the choice.

<h2>Documentation</h2>

On these webpages you will find the up-to-date manual for PYTHIA 8.1.
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.

<p/>
The overview can be found in the attached PDF file
<br/><a href="pythia8100.pdf" target="page"><b>A Brief Introduction
to PYTHIA 8.1</b></a>
<br/>T. Sj&ouml;strand, S. Mrenna and P. Skands, 
Comput. Phys. Comm. 178 (2008) 852 [arXiv:0710.3820].
<br/>You are strongly recommended to read this summary when you 
start out to learn how to use PYTHIA 8.1. Note that some details
have changed since the 8.100 version described there.

<p/>
For the physics description we refer to the complete 
<br/><b>PYTHIA 6.4 Physics and Manual</b>
<br/>T. Sj&ouml;strand, S. Mrenna and P. Skands, JHEP05 (2006) 026,
<br/>which in detail describes the physics (largely) implemented also in 
PYTHIA 8, and also provides a more extensive bibliography than found
here.

<p/>
When you use PYTHIA 8.1, you should therefore cite both, e.g. like
<br/><b>T. Sj&ouml;strand, S. Mrenna and P. Skands, JHEP05 (2006) 026,
Comput. Phys. Comm. 178 (2008) 852</b>.

<p/>
Furthermore, a separate 
<br/><a href="worksheet.pdf" target="page">
<b>PYTHIA 8 Worksheet</b></a>,
<br/>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.

<h2>Authors</h2>

<p/>
<b>Torbj&ouml;rn Sj&ouml;strand</b><br/> 
Department of Astronomy and Theoretical Physics, Lund University, 
S&ouml;lvegatan 14A, SE-223 62 Lund, Sweden<br/>
phone: + 46 - 46 - 222 48 16, e-mail: torbjorn@thep.lu.se   

<p/>
<b>Stefan Ask</b><br/>
Department of Physics, University of Cambridge, 
Cavendish Laboratory, JJ Thomson Ave., Cambridge CB3 0HE, UK<br/>
phone: +41 - 22 - 767 6707, e-mail: Stefan.Ask@cern.ch

<p/>
<b>Richard Corke</b><br/> 
Niels Bohr Institute, University of Copenhagen, Blegdamsvej 17,
2100 Copenhagen, Denmark<br/>
e-mail: richard.corke@thep.lu.se   

<p/>
<b>Stephen Mrenna</b><br/> 
Computing Division, Simulations Group, 
Fermi National Accelerator Laboratory,
MS 234, Batavia, IL 60510, USA<br/>
phone: + 1 - 630 - 840 - 2556, e-mail: mrenna@fnal.gov

<p/>
<b>Stefan Prestel</b><br/> 
Department of Astronomy and Theoretical Physics, Lund University, 
S&ouml;lvegatan 14A, SE-223 62 Lund, Sweden<br/>
phone: + 46 - 46 - 222 06 64, e-mail: stefan.prestel@thep.lu.se   

<p/>
<b>Peter Skands</b><br/> 
Theoretical Physics, CERN, CH-1211 Geneva 23, Switerland<br/> 
phone: + 41 - 22 - 767 2447, e-mail: peter.skands@cern.ch 

<h2>Further contributions</h2>

Makefiles, configure scripts and HepMC interface by <b>Mikhail Kirsanov</b>.
<br/>Conversion of XML files to PHP ones by <b>Ben Lloyd</b>.
<br/>Simple Makefile for Win32/NMAKE by <b>Bertrand Bellenot</b>.
<br/>Extended Higgs sector partly implemented by <b>Marc Montull</b>.
<br/>Parts of charm and bottom decay tables courtesy <b>DELPHI</b> and
<b>LHCb</b> collaborations.
<br/>Tunes and comparisons with data, based on Rivet and Professor, 
by <b>Hendrik Hoeth</b>.
<br/>Text and code on the use of ROOT in conjunction with PYTHIA 
by <b>Rene Brun</b>, <b>Andreas Morsch</b> and <b>Axel Naumann</b>.
<br/>Code and data for MRST/MSTW PDFs by <b>Robert Thorne</b> and
<b>Graeme Watt</b>.
<br/>Code and data for the CTEQ/CT PDFs by <b>Joey Huston</b> 
and colleagues. 
<br/>Help with implementing new proton PDFs by <b>Tomas Kasemets</b>.
<br/>Code and data for Pomeron PDFs by <b>H1</b> collaboration and
especially <b>Paul Newman</b>.  
<br/>Help with implementing new Pomeron fluxes and PDFs by <b>Sparsh Navin</b>.
<br/>The new Hidden Valley code developed together with <b>Lisa Carloni</b>.
<br/>Code for a Kaluza-Klein electroweak gauge boson provided by
<b>Noam Hod</b> and <b>Mark Sutton</b>.
<br/>Code for equivalent photon flux around an unresolved proton by 
<b>Oystein Alvestad</b>.
<br/>Part of the SUSY code by <b>Nishita Desai</b>.
<br/>Tau decays with decay models and helicity information by 
<b>Philip Ilten</b>.
<br/>The MBR diffractive model and central diffraction by 
<b>Robert Ciesielski</b>.
<br/><b>Note</b>: 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.

<h2>Licence</h2>

PYTHIA 8 is licensed under the 
<a href="COPYING" target="page"><b>GNU General Public Licence 
version 2</b></a>.
<br/>Please respect the 
<a href="GUIDELINES" target="page"><b>MCnet Guidelines</b></a>
for Event Generator Authors and Users.

<p/>
The program and the documentation is
Copyright &copy; 2012 Torbj&ouml;rn Sj&ouml;strand 
 

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