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 7.2.1, and is based on ThePEG 2.2.1

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

Documentation

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 (Eur.Phys.J. C76 (2016) no.4, 196) until the main Herwig 7 manual is available. The release note describes the new features of the latest version, 7.2.

Contact

Any questions or comments should be directed to herwig@projects.hepforge.org.

To receive email updates about new releases, please send a blank message to herwig-announce-join@projects.hepforge.org.

Herwig authors

Herwig is a collaborative effort and is developed by:

Johannes Bellm 1, Gavin Bewick 2, Silvia Ferrario Ravasio 2, Stefan Gieseke 3, David Grellscheid 4, Patrick Kirchgaeßer 3, Mohammad R. Masouminia 2, Graeme Nail 5, Andreas Papaefstathiou 5, Simon Plätzer 6, Michael Rauch 3, Christian Reuschle 1, Peter Richardson 2,7, Michael H. Seymour 8, Andrzej Siódmok 9 and Stephen Webster 2.

Former authors are:

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

Former contributors are:

Nadine Fischer, Marco Harrendorf, Daniel Rauch.

Herwig Talks and Publications

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

Contents:

Affiliations:

  1. Department of Astronomy and Theoretical Physics, Lund University,
  2. IPPP, Department of Physics, Durham University
  3. Institute for Theoretical Physics, Karlsruhe Institute of Technology
  4. Department of Informatics, University of Bergen
  5. Higgs Centre for Theoretical Physics, University of Edinburgh
  6. Particle Physics, Faculty of Physics, University of Vienna
  7. CERN, PH-TH, Geneva
  8. Particle Physics Group, School of Physics and Astronomy, University of Manchester
  9. The Henryk Niewodniczanski Institute of Nuclear Physics in Cracow, Polish Academy of Sciences