Would you like to work on a short project involving Monte Carlo event generators?
MCnet offers 3-6 month fully funded studentships for current PhD students.
See montecarlonet.org for more information!
WANTED: Analysis code
The LHC performed marvelously in Run 1, and we are looking for as much
analysis code as possible to make MC modelling even better for Run 2.
If you are member of an experimental collaboration, please have a look
wishlist and help us by providing us with Rivet analyses for your
publications. This will also ensure that your measurements get used!
The Rivet project (Robust Independent Validation of Experiment and Theory)
is a toolkit for validation of Monte Carlo event generators. It provides a
large (and ever growing) set of experimental analyses
useful for MC generator development, validation, and tuning, as well as a
convenient infrastructure for adding your own analyses. Rivet is the most
widespread way by which analysis code from the LHC and other high-energy
collider experiments is preserved for comparison to and development of
future theory models.
Rivet's design emphasises the separation between HepMC records and where
they came from, allowing it to be a completely cross-generator validation
platform. Internally, it uses a computationally efficient mechanism (known
as the "projections" system) to compute physical observables, so that
re-calculation of common quantities is avoided.
Another key feature of Rivet is the avoidance of
hard-coding reference data or histogram binnings in the analysis code:
Rivet provides functions to extract this information from bundled data
files, meaning that it is much easier to keep reference and generated
The Rivet user manual is kept up to date on the
arXiv (1003.0694 [hep-ph]).
Rivet is an object oriented C++ replacement for the venerable
HZTool/HZSteer system. It is
used by both phenomenologists/generator developers and by the LHC experiments
for generator tuning, analysis prototyping, and MC-data comparisons. For Fortran
generators you may find it useful to combine Rivet with the AGILe
generator steering interface, but for C++ generators such as Herwig++ and
Sherpa the built-in control programs are much better. For Pythia8, we recommend
using the Sacrifice
interface, which behaves much like AGILe.
More information on the status of the project, as well as a more
detailed description and documentation, can be found via the links
on the left.
2013-10-25: Rivet release 2.0.0
After an epic journey of code migration, testing, and endless technical bugfixing, we are
extremely pleased to finally announce the release of Rivet 2.0!
The main difference in this release series is the complete overhaul of the histogramming
system to use the new YODA package. This is a vast
improvement over the AIDA system that we have used since the origins of Rivet, and makes
much analysis statistics handling code far simpler and cleaner. It also automatically handles
gaps in binning, allows statistical merging of histograms from multiple generator runs,
and sets us up to add some very nice features involving multiple weights, NLO counter-events,
writing final-style histograms throughout a run, and merging of more complex data objects.
On the physics tools side, we also have big plans for the Rivet 2 series, including
improvements to the jet system for flavour tagging and substructure analyses. Plus more
and more data and MC validation analyses, of course!
We recommend that everyone begin to migrate their production systems to use Rivet 2. Please
let us know if you have any teething troubles and we will do what we can to alleviate them.
There will be one more release in the 1.x series: 1.8.4 and 2.0.1 will be released
in parallel to add all the analyses which have been supplied to us but have not yet appeared
in a release due to the length of time that it has taken to produce Rivet 2.0.0. After that,
it will be version 2 all the way ;-) Apologies and thanks to everyone who has been patiently
waiting for their analyses to appear in a release.
2013-12-106: Rivet release 1.9.0
Release 1.9.0 of Rivet is now available. This is the final release in the 1.x
series, primarily to supply new analyses which were provided to us during the development
of version 2.0.0. A version 2.1 will be provided to bring the analysis content of
the 2.x line up to the same point. As always, many thanks to everyone involved in
preparing the new analyses!
Rivet 1.8.3 is recommended for immediate production use. An updated manual
– documenting use of the system, the standard analyses, and the
underlying mechanisms – is available in the tarball, on this website,
and on the arXiv. All 1.x users are
encouraged to upgrade immediately... and to then immediately move on to 2.x!
Please let us know your experiences using Rivet, send us your analysis code to
be included in future releases, and suggest improvements
by emailing us at rivet@NOSPAMprojects.hepforge.org