Downloads

There is a release branch for every release which includes backports of bugfixes but keeps the api stable. You may acquire it by the means of:

  • git clone -b rel-a-b-c https://gitlab.com/sherpa-team/sherpa.git

where a, b, and c correspond to the version number a.b.c.

The following is autogenerated from our gitlab tags.

Sherpa 2.2.8

Version 2.2.8 is a bugfix release in the Cho Oyu series and we encourage all users to update to this version.

If you spot any problem, please send us an email. If you would like to be informed about newer releases, please subscribe to our announcement mailing list.

Download

The Sherpa package can be downloaded here: SHERPA-MC-2.2.8.tar.gz

In can also be accessed via git using

  • the web interface

  • or git clone -b rel-2-2-8 https://gitlab.com/sherpa-team/sherpa.git for a local clone.

A Manual is included in the Manual/ directory of the tarball (or the git-clone). It is available in the HTML and INFO format and provides extensive documentation of all parameters. It can also be found online.

References

The main reference for Sherpa 2.2.x is arXiv:1905.09127. Please cite this publication if you have used Sherpa 2.2.x 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.

Examples

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.

Changelog

Enhancements

  • Phase space biasing with Enhance_Observable re-enabled for unweighted events (!193, !209)

  • Significant reduction of negative weight fraction possible with NLO_CSS_PSMODE=1 option for leading-colour S-event showering !200

  • Improve safeguarding against large Sudakov reweighting factors !212

  • HepMC 3.1 interface added !196

  • Rivet 3.x interface added !192

  • Make OpenLoops library finding more robust, e.g. for LCG OpenLoops installation !215

Bugfixes (runtime issues)

  • Crash when soft spin correlations and neutral meson mixing were enabled #53 – thanks for the report from ATLAS

  • Widths updated in hard decay handler not used by ME generators #182

Bugfixes (compilation issues)

  • None

Known issues

  • Note that dijet production with additional jets merged with the CKKW algorithm is broken in the 2.2.x series #46

  • Also see our issue tracker

Sherpa 2.2.7

Release version 2.2.7

Release notes on GitLab.

Sherpa 2.2.6

Release version 2.2.6

Release notes on GitLab.

Sherpa 2.2.5

Release version 2.2.5

Release notes on GitLab.

Sherpa 2.2.4

Release version 2.2.4

Release notes on GitLab.

Sherpa 2.2.3 (Cho Oyu)

Version 2.2.3 is a bugfix release and adds the support of the Recola one-loop generator.

Release notes on GitLab.

Sherpa 2.2.2 (Cho Oyu)

Version 2.2.2 is a bugfix release.

Release notes on GitLab.

Sherpa 2.2.1 (Cho Oyu)

Version 2.2.1 is a feature-release based on the second NLO version of Sherpa. The program now allows to compute scale uncertainties for one and the same event sample on-the-fly in all types of simulation setups. There are no physics changes in this release, so events generated with the same run card should be identical to the ones in 2.2.0. A more detailed changelog can be found below.

Release notes on GitLab.

Sherpa 2.2.0 (Cho Oyu)

Version 2.2.0 is a feature-release based on the second NLO version of Sherpa. The program now supports the UFO model format, it allows to compute scale uncertainties for one and the same event sample on-the-fly, and it hosts a new parton shower.

Release notes on GitLab.

Sherpa 2.1.1 (Broad Peak)

Version 2.1.1 is a bugfix-release based on the second NLO version of Sherpa. A description of the issues which have been addressed can be found below. Additionally, the simulation of DIS at ep colliders has been re-validated.

Release notes on GitLab.

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.

Release notes on GitLab.

Sherpa 2.0.0 (Annapurna)

Version 2.0.0 is the first NLO version of Sherpa. The main new feature compared to the 1.4.x series is the introduction of MEPS@NLO merging. This release improves upon the previous beta series by an extension of its physics capabilities and an extensive validation of all features already present in the 1.4.x series.

Release notes on GitLab.

Sherpa 1.4.5

Version 1.4.5 is a bugfix release of Sherpa.

Release notes on GitLab.

Sherpa 1.4.3

Version 1.4.3 is a convenience and bugfix release of Sherpa.

Release notes on GitLab.

Sherpa 1.4.2

Version 1.4.2 is a convenience and bugfix release of Sherpa. The main new feature compared to 1.4.1 is the introduction of the TUNE parameter which can be set to NNPDF23, NNPDF23_UEup, NNPDF23_UEdown, CT10, CT10_UEup, and CT10_UEdown. The CT10 option is the default setting (no change to 1.4.1), NNPDF23 provides settings for NNPDF 2.3, and the UEup and UEdown variants change the underlying event activity by +/-10%.

Release notes on GitLab.

Sherpa 1.4.1

Version 1.4.1 is a bugfix release of Sherpa which does not contain any new features compared to 1.4.0.

Release notes on GitLab.

Sherpa 1.4.0

Version 1.4.0 is a major update of Sherpa which contains several new features.

Release notes on GitLab.

Sherpa 1.3.1

Version 1.3.1 is a bugfix update of Sherpa which does not contain new features.

Release notes on GitLab.

Sherpa 1.3.0

Version 1.3.0 is an update of Sherpa which contains bugfixes and new features.

Release notes on GitLab.

Sherpa 1.2.3

Version 1.2.3 is an update of Sherpa which contains bugfixes and new features.

Release notes on GitLab.

Sherpa 1.2.2

Version 1.2.2 is an update of Sherpa which contains mainly bugfixes.

Release notes on GitLab.

Sherpa 1.2.1

Version 1.2.1 is an update of Sherpa which contains many physics improvements and bugfixes.

Release notes on GitLab.

Sherpa 1.2.0

Version 1.2.0 is a major update of Sherpa which contains many physics improvements and also some minor user interface changes. Correspondingly, the input structure has been improved.

Release notes on GitLab.

Sherpa 1.1.3

Version 1.1.3 includes all bugfixes for previous versions as well as new ones.

Release notes on GitLab.

Sherpa 1.1.2

Version 1.1.2 includes all bugfixes for previous versions as well as new ones.

Release notes on GitLab.

Sherpa 1.1.1

Version 1.1.1 includes all bugfixes for previous versions as well as new ones.

Release notes on GitLab.

Sherpa 1.1.0

Version 1.1.0 includes all bugfixes for previous versions as well as new features.

Release notes on GitLab.

Sherpa 1.0.9

Sherpa Release 1.0.9

Release notes on GitLab.

Sherpa 1.0.8

Sherpa Release 1.0.8

Release notes on GitLab.

Sherpa 1.0.7

Sherpa Release 1.0.7

Release notes on GitLab.

Sherpa 1.0.6

Sherpa Release 1.0.6

Release notes on GitLab.