The WHIZARD Event Generator
The Generator of Monte Carlo Event Generators
for Tevatron, LHC, ILC, CLIC, CEPC, FCC-ee, FCC-hh, SppC and other High Energy Physics Experiments
What is WHIZARD?
is a program system designed for the efficient calculation
of multi-particle scattering cross sections and simulated event
Tree-level matrix elements are generated automatically for arbitrary
partonic processes by using the Optimized Matrix Element Generator
O'Mega. Matrix elements obtained by alternative methods (e.g., including loop
corrections) may be interfaced as well. The program is able to
calculate numerically stable signal and background cross sections and
generate unweighted event samples with reasonable efficiency for
processes with up to eight final-state particles; more particles are
possible. For more particles, there is the option to generate
processes as decay cascades including complete spin correlations.
Different options for QCD parton showers are available.
Polarization is treated exactly for both the initial and final states.
Final-state quark or lepton flavors can be summed over automatically
where needed. For hadron collider physics, an interface to the
standard LHAPDF is provided. For Linear Collider physics,
beamstrahlung (CIRCE) and ISR spectra are included for electrons
The events can be written to file in standard formats,
including ASCII, StdHEP, the Les Houches event format (LHEF),
HepMC, or LCIO. These event files can then be hadronized.
WHIZARD supports the Standard Model and a huge number of BSM models.
Model extensions or completely different models can be added.
There are also interfaces to FeynRules and SARAH.
The official version is 2.4.1. (released:
Mar 24th, 2017.)
The distribution tarball of the
sources can be found here
Before installing WHIZARD, you should check the
note on compilers and the page on possible
build problems in the
The manual for WHIZARD 2 is not yet completed. We
regularly update the version from the distributions (
link, last update: 2016-11-29).
There is also a
HTML version of the manual.
You can find a few
worked physics examples
The documented source code can be found here
There is also a manual for GAMELAN, the graphics
package based on MetaPost for WHIZARD's internal analyses.
You may also want to inspect the latest news and the
list of changes.
Prerelease versions, alpha versions, patches, and unofficial versions
might be found here
(link). This contains also the "instant" WHIZARD install scripts.
MAC OS X MacPorts: Since version 2.1.0, WHIZARD is now
available for MAC OS X on MacPorts!
MAC OS X Darwin >= 10.11: There is a known issue
on Darwin >= 10.11 concerning the test suite. Confer the wiki for more information.
Service for archaeologists and regression testers: old sources are kept here
(link) and here (link).
The WHIZARD team, contact, funding
WHIZARD has been written by
Wolfgang Kilian (U. Siegen)
Thorsten Ohl (U. Würzburg)
Further members of the WHIZARD team are (special topics):
Fabian Bach (DESY)
: top physics, anomalous top couplings, ROOT and HOPPET interfaces, NRQCD resummation,
Simon Brass (U. Siegen)
: EW physics, parallelization, performance,
Bijan Chokoufe Nejad (DESY)
: Multi-jet physics, parallelization, shower/matching, top physics, top threshold
Christian Fleper (U. Siegen)
: NLO QED+EW, photon matching and merging,
Sebastian Schmidt (U. Freiburg)
: Shower, Matching, PYTHIA interface,
Marco Sekulla (KIT)
: EW physics/resonances, unitarization,
So Young Shim (DESY)
: dim 6-operators,
Christian Speckner (Würzburg)
: Beam polarization, FeynRules interface, 3-site models, NLO and dipoles,
Florian Staub (CERN)
: SARAH interface, FeynRules interface (partially),
Christian Weiss (DESY)
: NLO automation, FKS subtraction, phase space,
Zhijie Zhao (U. Siegen)
: NLO QCD, e+e- physics.
The current version is
2.4.1 (Mar 24th, 2017)
The WHIZARD project is a part of the Strategic Helmholtz Alliance
Physics at the Terascale.
We are furthermore supported or have been supported in earlier
stages of this work by the German Bundesministerium für
Bildung und Forschung (BMBF), the German Deutsche
Forschungsgemeinschaft (DFG), and the Ministerium für
Wissenschaft und Kultur (MWK) of the state
We gratefully thank the contributions from our former team members:
Hans-Werner Boschmann (U. Siegen), Steffen Schwertfeger (U. Siegen),
Matthias Trudewind (U. Siegen),
Daniel Wiesler (DESY)
If you use WHIZARD, please cite the following publications
- W. Kilian, T. Ohl, J. Reuter, WHIZARD: Simulating
Multi-Particle Processes at LHC and ILC ,
Eur.Phys.J.C71 (2011) 1742,
- M. Moretti, T. Ohl, J. Reuter, O'Mega: An Optimizing matrix
element generator , LC-TOOL-2001-040-rev, arXiv:
There is also the older (now deprecated) write-up for WHIZARD 1
(please cite the two references on top):
The reference for the WHIZARD-FeynRules interface is:
- N. Christensen, C. Duhr, B. Fuks, J. Reuter, C. Speckner,
Eur.Phys.J.C72 (2012) 1990,
arXiv: 1010.3251. [hep-ph]
WORKSHOPS and WHIZARD User Forum
2nd International WHIZARD Forum, Würzburg U., March 16 - 18, 2015
1st International WHIZARD Forum, DESY, Nov. 21 - 23, 2011
DEVELOPMENT version (SVN trunk)
You can also access our subversion repository at
http://whizard.hepforge.org/svn/trunk for checking out
(pun intended!) the current sources. Note, that the svn
contains the latest developer version. In order to be able to
compile the svn version, one has to first generate the configure.ac
by executing the shell script build_master.sh, then generate
script out of the file configure.ac by running
autoreconf (NOT autoconf) which is part of
package. Furthermore, the development version also needs the
noweb tools to be installed on the system in order to
extract the source codes and documentation from several so
called .nw files. The noweb
package can be downloaded and installed from here:
Examples of WHIZARD usage:
A standard reference of SM ILC cross sections can be found here.
A standard reference of SUSY cross sections can be found here.
WHIZARD 1: The sources for version 1.97 can be
here. Note that with version 1.94 the development of
new features in version 1 stops; there will be only bug fixes
from now on.
Look at this link for
The manual is
available in HTML and in PostScript and PDF