Sherpa 2.1.0 (Broad Peak)
Version 2.1.0 is the second NLO version of Sherpa. The main new feature compared to the 2.0.x series is the automated simulation of spin-correlated decay chains. Additionally, Comix may be used for simulating H events in MC@NLO, which speeds up initialization times and runtimes. This release improves upon the previous series by an extension of its physics capabilities and an extensive validation of all features already present in the 2.0.x series.
If you spot any problem, please send us an email or post a ticket on trac. This will allow us to reach a mature version of the generator, suitable for all physics analyses. If you would like to be informed about patches and newer releases, please subscribe to our announcement mailing list.
The Sherpa package can be downloaded here:
In can also be accessed via svn through
A Manual is included in the Manual/ directory of the tarball. It is available in the HTML and INFO format and provides extensive documentation of all parameters. It can also be found online.
The main reference describing the physics of Sherpa is JHEP02 (2009) 007. Please cite this publication if you have used Sherpa for your studies. Additionally, each run will produce a file called Sherpa_References.tex which contains information about the modules used in this run and the corresponding publications which should be referred. If in doubt, please seek the advice of the Sherpa authors.
You can find a large collection of example setups for using SHERPA in various different colliders/processes in the Examples/ directory of the tarball. They are also described in the manual.
Patches/known problems/known bugs/FAQs
All known problems/questions and their solutions can be found on our issue tracker. If you encounter any problem while installing or running Sherpa, please open a new issue in the tracker.
- We have introduced SQLite as the preferred storage manager. This may require some additional steps during installation, see this page. For installation on HPC systems, please refer to this page
- Spin correlated decay chains (Comix only), includes all 1->2 and 1->3 decays allowed by the model, iterated to arbitrary decay chain length, all decay steps are dressed with QCD parton showers and QED corrections
- MC@NLO H events with Comix, speeds up initialisation and runtime