or git clone -b rel-2-2-5 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
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.
As all releases in the v2.2.x series, dijet production using the multi-jet merging algorithm is broken, see #46. This is fixed in the upcoming v3.0. If you can not wait for it, you can use a v2.1.x release.
Add preliminary support for HepMC3 (this interface is still being tested)
Improve decay showering off top quarks
Improve single-top support and add examples and documentation for its
Improve hadronisation and hadron decays for heavy flavour production
Introduce a user hook framework which allows users to easily implement event
generation afterburners, see Examples/Userhook
Add settings to output ME-only on-the-fly variations (along with the full
ones): HEPMC_INCLUDE_ME_ONLY_VARIATIONS=1 (HepMC interface)
New cut-off for parton-shower reweighting: CSS_REWEIGHT_SCALE_CUTOFF=<pt_min>, default: 5 GeV^2
this is more generally applicable than using a cut-off on the number of
Improve support for on-the-fly variations of clustering steps (reweight each
step locally instead of doing it globally)
Fix issue with the overweight treatment for negative weights
Add missing shower weight in some event outputs, e.g. when using OUTPUT HepMC...
Fix issue with the overweight threshold for on-the-fly variations
Fix issue with non-trivial beam spectra handling
Fix possible issues with electron-"PDF" initialization
Fix issue with the ISR-channel threshold for leptonic collider
Fix X/Y functions in METOOLS (this is relevant for hadron decays)
Fix crash in decay-channel sorting
Fix crash when using EVENT_TYPE=HadronDecay
Fix issue with CSS strong coupling values when using non-trivial scale factors
Fix issue with QSF variations for real emission calculations with COMIX
Fix crash when doing on-the-fly variations and invalid dipole kinematics
Fix issue in the interplay of the flux and the BIWeight for 1->n
Fix issue when using vertices with a vanishing coupling
Fix rare "invalid amplitude" crashes
Fix issues when adding limits for the number of t-channel propagators in
Fix issue with checking PDF availability when enforcing jet vetoes