Herwig 7.0 / Herwig++ 3.0 Release Note

TL;DR

Herwig 7.0 introduces comprehensive improvements to the Herwig++ event generator, including NLO calculations, QED radiation, spin correlations, and uncertainty treatments, enhancing accuracy and versatility in particle physics simulations.

Contribution

This release unifies Herwig++ and HERWIG into a major version 7, adding advanced features like NLO processes, QED radiation, and improved uncertainty handling.

Findings

Built-in NLO calculations for all Standard Model processes

Inclusion of QED radiation and spin correlations

Enhanced perturbative uncertainty treatment

Abstract

A major new release of the Monte Carlo event generator Herwig++ (version 3.0) is now available. This release marks the end of distinguishing Herwig++ and HERWIG development and therefore constitutes the first major release of version 7 of the Herwig event generator family. The new version features a number of significant improvements to the event simulation, including: built-in NLO hard process calculation for all Standard Model processes, with matching to both angular-ordered and dipole shower modules via both subtractive (MC@NLO-type) and multiplicative (Powheg-type) algorithms; QED radiation and spin correlations in the angular ordered shower; a consistent treatment of perturbative uncertainties within the hard process and parton showering. Several of the new features will be covered in detail in accompanying publications, and an update of the manual will follow in due course.