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 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…

• AC
  Aspen Center for Physics
• DF
  Deutsche Forschungsgemeinschaft
• BF
  Bundesministerium für Bildung und Forschung
• RD
  Rural Development Administration
• DE
  Deutsches Elektronen-Synchrotron