Present program version: PYTHIA 8.2
While the release of PYTHIA 8.100 marked a clear break with the
Fortran-based PYTHIA 6.4, the introduction of PYTHIA 8.2 follows
the path of gradual evolution. That is, the new version does involve
several new features, and some backwards incompatibilities, but not
anything really dramatic. User-written programs that worked with 8.186
are also likely to work with 8.200, or at most require modest adjustments.
Given the low threshold, the advantages with the new version made for
a reasonably rapid transition.
The next version, PYTHIA 8.3, is still
in a tryout stage. It offers a slightly larger step from 8.2 than
between 8.1 and 8.2, but again no major incompatibilities. Therefore
we expect a new rapid transition once the code has been fully validated.
No further major upgrades are planned for 8.2, but possibly there
will be some bug-fix releases before the code is fully frozen.
Look here for information on how to obtain
new version alerts, how to contact us and how you can help us further
See the Introduction for remarks on the
To get going with the program, do the following (on a Linux or Mac OS X
- Download the file
pythia8244.tgz to a suitable location.
- Unzip and expand it with
tar xvfz pythia8244.tgz.
- Move to the thus created
- Read the
README file in it for installation
instructions, and apply them.
(If you are not going to link any external libraries, or have
any other special demands, you only need to type
- Move to the
examples subdirectory and read the
README file there for instructions how to do some
(Again, if you do not link to external libraries, you only need
make mainNN followed by
./mainNN > outNN, where
a two-digit number in the range 01 - 30.)
All necessary information how to run the program is available in
subdirectories of the
pythia8244 directory you unpacked
above, and copies of them are also linked here.
An Introduction to PYTHIA 8.2,
for an overview. This article, in arXiv:1410.3012 [hep-ph], has been
published in Comput. Phys.Commun. 191 (2015) 159.
- The current
online HTML manual can be accessed if you
file in a web browser.
- Alternatively, the current online PHP manual contains the same text,
but additionally offers a simple graphical-user-interface, with which
you can save a file with the settings you want to use in a run.
For security reasons a direct link on this page has been removed.
Update History forms an integral part of the manual.
- So does the
description of existing main programs, which offers many hints how to
address various programming issues.
Doxygen representation of the code is available. It offers
a quick way to look up classes and methods, but is not a replacement
for the manual.
- The distribution also comes with a
PYTHIA 8.2 Worksheet,
primarily intended for summer schools, but also suitable for
self-study, to get going.
For the merging study the option exists to download larger LHE files
than come with the standard PYTHIA distribution:
- A Docker container for PYTHIA 8 and DIRE can be obtained
here. You will there also
find some Jupyter notebooks and notes e.g. how to use Rivet analyses.
- Several presentations on the status and development of PYTHIA
can be found here.
- In addition, the complete
PYTHIA 6.4 Physics
and Manual is still relevant for much of the physics in 8.2, and
A Brief Introduction to PYTHIA 8.1 may also contain
some useful material, although some of it is superseded by the current
An Introduction to PYTHIA 8.2.
Normally there should be no reason now to install an older, obsolete version.
However, for backwards checks, this might be required,
so here are the previous ones: