Version 1.4.5 is a bugfix release of Sherpa.

Sherpa 1.4.5

Version 1.4.5 is a bugfix release of Sherpa. Please see the Changelog below for a complete summary of the changes. 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 git using

  • the web interface
  • or git clone -b rel-1-4-5 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.


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.


Note that this release is identical to 1.4.4 except for one changeset which was accidently missing in the original 1.4.4 tarball. The following changes are listed with respect to version 1.4.3:


  • Bugfix in amplitudes containing effective-theory couplings to the Higgs boson
  • Bugfix for issue in hadron decays: Some exotic particles were accidently produced and left stable without warning
  • Compile fixes for MacOS and gcc 4.7 compatibility
  • Improved multipole radiation pattern for ME QED corrections in the YFS approach

Other changes with respect to 1.4.3

  • The default for the parameter UNITARIZATION_N in the model implementation of anomalous gauge couplings now has a default of '2' (instead of disabling unitarization by the previous default of '0')