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Herwig++ Versions

The latest release series of Herwig++ is 2.6, first released in May 2012. To receive email updates about new releases, please send a blank message to herwig-announce-join@projects.hepforge.org.

The detailed Herwig++ reference manual containing many examples is available at arXiv:0803.0883. The new features that were introduced in versions 2.4 and 2.5 are described in our release note [arXiv:1102.1672]. The release note [arXiv:1205.4902] describes the new features in version 2.6.

Another useful reference with much information on the physics background of Herwig++ is the MCnet review paper on Monte Carlo event generators, arXiv:1101.2599.

Examples of the results of Herwig++ compared to LEP, Tevatron jet, Tevatron W/Z, Tevatron photon production, Star, LHC jet, LHC W/Z, LHC photon production, HERA, CERN SppS and ISR and B-factory data made using Rivet are also available.

The Herwig++ tarball contains LoopTools by Thomas Hahn.

Herwig++ 2.6.3 release

2013-02-22: Herwig++ 2.6.3 has been released. It requires ThePEG 1.8.3.

The main improvement in this small bug fix release is a fix for some broken displaced vertices. In some circumstances, internal technical vertices that only changed a particle's momentum caused a displacement to occur. Thanks to ATLAS for the bug report!

As usual, the 'NEWS' files in both source tarballs contain a detailed list of changes. Any questions or comments should be directed to herwig@projects.hepforge.org.

Please respect the MCnet guidelines for Event Generator authors and users.

Contact herwig@projects.hepforge.org with comments or questions.

Herwig++ 2.6.2 release

2013-02-01: Herwig++ 2.6.2 has been released. It requires ThePEG 1.8.2.

The main improvements are

  • fixes for the PDF and scale choices in POWHEG events, which should solve reported anomalies in POWHEG jet rates, and
  • the possibility of including branching ratio factors in the reported cross-section.

Herwig++ 2.6.1 release

2012-10-16: Herwig++ 2.6.1 has been released. It requires ThePEG 1.8.1.

The main improvements are

  • The width treatment in BSM models has been made more robust and is now switched on by default.
  • Improvements to Matchbox and the Dipole shower.
  • Little Higgs models are now available.
  • Several smaller bugs were fixed. A special thanks to ATLAS for the many useful reports!

Herwig++ 2.6.0 release

2012-05-21: Herwig++ 2.6.0 has been released. It requires ThePEG 1.8.0.

The main improvements are

  • A new NLO framework, "Matchbox", for performing NLO calculations at fixed order or matched to parton showers.
  • A first implementation of the coherent dipole shower algorithm.
  • Alternative samplers and the ExSample library.
  • An interface to events generated with AlpGen, allowing for MLM merging.
  • New BSM models for colour sextets, the CDF t-tbar asymmetry and Z'
  • POWHEG VBF production of Higgs bosons.
  • Automatic extrapolation of the energy-dependent underlying-event parameter pTmin

Archive

Archived older versions.

For more up-to-date information and user guides, see the ThePEG/Herwig++ Wiki.