Version 2.0.β is a pre-release of Sherpa. The main new feature compared to the 1.4.x series is the introduction of MEPS@NLO merging. Sherpa 2.0.β is not yet fit for production of event samples for arbitrary processes but rather intended to allow interested users to start exploring the new features.
The following processes have been validated so far
- Jets (MENLOPS, MC@NLO, MEPS@LO)
- ll+jets (MEPS@NLO, MENLOPS, MC@NLO, MEPS@LO)
- lν+jets (MEPS@NLO, MENLOPS, MC@NLO, MEPS@LO)
- h+jets in ggF (MEPS@NLO, MENLOPS, MC@NLO, MEPS@LO)
- ttW (MC@NLO, MEPS@LO)
More processes will follow in the near future, and the code will be continously updated. The most recent version is always accessible through the svn repository.
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 physics analysis. 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 (please log in with username "user" and password "sherpa"). If you encounter any problem while installing or running Sherpa, please open a new issue in the tracker.