WHIZARD—simulating multi-particle processes at LHC and ILC

We describe the universal Monte-Carlo (parton-level) event generator WHIZARD ( http://whizard.event-generator.org ), version 2. The program automatically computes complete tree-level matrix elements, integrates them over phase space, evaluates distributions of observables, and generates unweighted p...

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Bibliographic Details
Published in:The European physical journal. C, Particles and fields Particles and fields, 2011-09, Vol.71 (9), p.1-29, Article 1742
Main Authors: Kilian, Wolfgang, Ohl, Thorsten, Reuter, Jürgen
Format: Article
Language:English
Subjects:
Astronomy
Astrophysics and Cosmology
Cascades
Computer simulation
Correlation
Couplings
Elementary Particles
Exact sciences and technology
Hadrons
Heavy Ions
Helicity
Large Hadron Collider
Leptons
Measurement Science and Instrumentation
Monte Carlo methods
Monte Carlo simulation
Nuclear Energy
Nuclear Physics
Partons
Physics
Physics and Astronomy
Quantum Field Theories
Quantum Field Theory
Special Article - Tools for Experiment and Theory
Standard model (particle physics)
String Theory
The physics of elementary particles and fields
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Description
Summary:We describe the universal Monte-Carlo (parton-level) event generator WHIZARD ( http://whizard.event-generator.org ), version 2. The program automatically computes complete tree-level matrix elements, integrates them over phase space, evaluates distributions of observables, and generates unweighted partonic event samples. These are showered and hadronized by calling external codes, either automatically from within the program or via standard interfaces. There is no conceptual limit on the process complexity; using current hardware, the program has successfully been applied to hard scattering processes with up to eight particles in the final state. Matrix elements are computed as helicity amplitudes, so spin and color correlations are retained. For event generation, processes can be concatenated with full spin correlation, so factorized approximations to cascade decays are possible when complete matrix elements are not desired. The Standard Model, the MSSM, and many alternative models such as Little Higgs, anomalous couplings, or effects of extra dimensions or noncommutative SM extensions have been implemented. Using standard interfaces to parton shower and hadronization programs, WHIZARD covers physics at hadron, lepton, and photon colliders.
ISSN:1434-6044
1434-6052
DOI:10.1140/epjc/s10052-011-1742-y