The Herwig Event Generator

Herwig is a multi-purpose particle physics event generator.

It is built based on the experience gained with both the HERWIG 6 and Herwig++ 2 event generators. Continuing the Herwig++ 2 development, Herwig 7.0 (Herwig++ 3.0) replaces any prior HERWIG or Herwig++ versions.

Herwig provides significantly improved and extended physics capabilities when compared to both its predecessors, HERWIG 6 and Herwig++ 2, while keeping the key model motivations such as coherent parton showers (including angular-ordered and dipole-based evolution), the cluster hadronization model, an eikonal multiple-interaction model, highly flexible BSM capabilities and improved perturbative input using next-to-leading order QCD.

Download and Installation

The current version is Herwig 7.0.0, and is based on ThePEG 2.0.0.

For installation we recommend to use our bootstrap script which is available here. See the tutorials for detailed installation instructions.


Installing and using the current version is extensively covered in the tutorials. A detailed manual covering all physics developments since Herwig++ 2 is in preparation.

The detailed Herwig++ 2 manual is arXiv:0803.0883. When using Herwig 7, please cite this manual along with the Herwig 7 release note (arXiv:1512.01178) until the main Herwig 7 manual is available.


Any questions or comments should be directed to

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Herwig authors

Herwig is a collaborative effort and is developed by:

Johannes Bellm 1, Stefan Gieseke 2, David Grellscheid 1, Simon Plätzer 1,3, Michael Rauch 2, Christian Reuschle 5, Peter Richardson 1,4, Peter Schichtel 1, Mike Seymour 3, Andrzej Siódmok 4,6, and Alix Wilcock 1.

With contributions by:

Nadine Fischer 2, Marco Harrendorf 7, Graeme Nail 3, Andreas Papaefstathiou 4, and Daniel Rauch 2.

Former authors are:

Ken Arnold, Manuel Bähr, Luca d’Errico, Martyn Gigg, Keith Hamilton, Seyi Latunde-Dada, Alberto Ribon, Christian Röhr, Pavel Růžička, Alex Schofield, Thomas Schuh, Alexander Sherstnev, Philip Stephens, Martin Stoll, Louise Suter, Jon Tully, Bryan Webber, David Winn and Benedikt Zimmermann.

Herwig Talks and Publications

Some of the recent Herwig developments are covered in several talks and publications listed below.



  1. IPPP, Department of Physics, Durham University
  2. Institute for Theoretical Physics, Karlsruhe Institute of Technology
  3. Particle Physics Group, School of Physics and Astronomy, University of Manchester
  4. CERN, PH-TH, Geneva
  5. HEP Theory Group, Department of Physics, Florida State University
  6. The Henryk Niewodniczanski Institute of Nuclear Physics in Cracow, Polish Academy of Sciences
  7. Institut für Experimentelle Kernphysik, Karlsruhe Institute of Technology