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

Sherpa 1.3.1

Version 1.3.1 is a bugfix update of Sherpa which does not contain new features. Please see the Changelog below for a complete summary. If you would like to be informed about patches and newer releases, please subscribe to our announcement mailing list.

Download

The Sherpa package can be downloaded here:

In can also be accessed via git using

  • the web interface
  • or git clone -b rel-1-3-1 https://gitlab.com/sherpa-team/sherpa.git for a local clone.

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.

References

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.

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.

Tunes for different PDFs

In addition to the default PDF, we have also tuned Sherpa 1.3.1 with CTEQ6L1 and CT10. Here are the results:

CTEQ6L1:

K_PERP_MEAN_1 0.573
K_PERP_MEAN_2 0.573
K_PERP_SIGMA_1 0.898
K_PERP_SIGMA_2 0.898
PROFILE_PARAMETERS 0.884 0.828
RESCALE_EXPONENT 0.244
SCALE_MIN 2.65
SIGMA_ND_FACTOR 0.788

CT10:

K_PERP_MEAN_1 1.17
K_PERP_MEAN_2 1.17
K_PERP_SIGMA_1 0.760
K_PERP_SIGMA_2 0.760
PROFILE_PARAMETERS 0.576 0.353
RESCALE_EXPONENT 0.238
SCALE_MIN 2.52
SIGMA_ND_FACTOR 0.465

Patches/known problems/known bugs/FAQs

All known problems/questions and their solutions can be found on our issue tracker (please log in using the given details). If you encounter any problem while installing or running Sherpa, please open a new issue in the tracker.

  • Suppressing unitarisation output in SM+AGC model, not currently listed on the bug tracker. Fix: Apply patch file via patch -p0 < AGC-output.patch in the top level directory of your Sherpa installation, and recompile using 'make install'.

Changelog

Bugfixes w.r.t. Version 1.3.0

All patches available for previous versions are included in this release:

  • Bugfix for MPI shower setup and corresponding new tune
  • Bugfix for MPI initialization and QCD simulations
    cf. ticket 180
  • Bugfixes for ME level NLO event generation

New features/Improvements

  • None