Abstract
We describe the universal Monte-Carlo event generator WHIZARD. The program automatically computes complete tree-level matrix elements, integrates them over phase space, evaluates distributions of observables, and generates unweighted event samples that can be used directly in detector simulation. There is no principal 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. 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 PDF, beamstrahlung, parton shower and hadronization programs, WHIZARD generates complete physical events and covers physics at hadron, lepton, and photon colliders.
Highlights
VAMP . . . 16 ing standard interfaces to parton shower and hadronization programs, WHIZARD covers physics at hadron, lepton, and photon colliders
We describe the current status of the WHIZARD [21, 22] package, which provides a particular approach to the challenges of multi-parton matrix-element construction and event generation in multi-particle partonic phase-space
Data taking at the LHC has begun and almost the whole standard model has already been rediscovered at the time of writing
Summary
At the LHC and the future ILC experiments, we hope to uncover the mechanism of electroweak symmetry breaking and to find signals of physics beyond the Standard Model (SM). Monte-Carlo tools such as PYTHIA [1, 2] or HERWIG [3, 4] are able to predict signal rates for SM as well as various new-physics processes These programs contain hard-coded libraries of leading-order on-shell matrix elements for simple elementary scattering, decay, and radiation processes. Its main components are the O’Mega [25,26,27,28] matrix element generator, the VAMP [12] adaptive multi-channel multi-dimensional integration library, and its own module for constructing suitable phase-space parameterizations These parts, which use original algorithms and implementations, are the focus of the present paper. A third path, which is not yet in production status and will be the subject of a separate publication [13], involves an independent parton-shower module that is to be combined with (external) hadronization
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