Herwig++ Physics and Manual

TL;DR

Herwig++ 2.3 is a comprehensive Monte Carlo event generator that simulates various particle collision processes, including BSM physics, with detailed modeling of QCD radiation, hadronization, and decays.

Contribution

This paper introduces Herwig++ 2.3, featuring enhanced simulation capabilities for multiple collision types, BSM models, and improved radiation and hadronization modeling.

Findings

Supports a wide range of collision processes

Includes interface for external matrix element generators

Simulates BSM physics with customizable models

Abstract

In this paper we describe Herwig++ version 2.3, a general-purpose Monte Carlo event generator for the simulation of hard lepton-lepton, lepton-hadron and hadron-hadron collisions. A number of important hard scattering processes are available, together with an interface via the Les Houches Accord to specialized matrix element generators for additional processes. The simulation of Beyond the Standard Model (BSM) physics includes a range of models and allows new models to be added by encoding the Feynman rules of the model. The parton-shower approach is used to simulate initial- and final-state QCD radiation, including colour coherence effects, with special emphasis on the correct description of radiation from heavy particles. The underlying event is simulated using an eikonal multiple parton-parton scattering model. The formation of hadrons from the quarks and gluons produced in the parton shower is described using the cluster hadronization model. Hadron decays are simulated using matrix elements, where possible including spin correlations and off-shell effects.