Rivet is hosted by Hepforge, IPPP Durham


MCnet studentships!

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 at our 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 data synchronised.

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.

2014-03-10: Rivet release 2.1.1

We are very happy to announce the release of the third Rivet version in the 2.x series, version 2.1.1.

This version updates the Rivet 2.1.0 analysis content to contain four new analyses (two each from ATLAS and CMS: see the analysis content diff page), and providing better tools for Particle/Jet sorting (e.g. a new sortByPt() function for Jets and Particles vectors) and querying Particles about their decay products. Access has been provided to the YODA analysis object collection via the AnalysisHandler interface.

There are of course also bug-fixes and as always we encourage everyone to upgrade immediately. Installation requires the new YODA version 1.0.6, released at the same time. Build scripts for LCG and stand-alone systems are available: check the "Getting started" doc page.

We intend to continue with more 2.1.x minor releases to provide analysis updates as rapidly as practically possible. The next major release will be version 2.2.0, in which the jet, histogram, and kinematic cuts systems will be significantly upgraded.

2013-12-16: 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 1.9.0 is recommended for immediate production use for those who have not yet moved to the 2.x series. 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