WHIZARD: Simulating Multi-Particle Processes at LHC and ILC

TL;DR

WHIZARD is a versatile Monte Carlo event generator capable of simulating complex multi-particle processes at colliders, supporting various models and providing detailed event samples for experimental analysis.

Contribution

It introduces a universal, automated tool for computing and generating events for multi-particle processes across different collider types, accommodating complex models and high final-state multiplicities.

Findings

Successfully applied to processes with up to eight particles in the final state.

Supports a wide range of physics models including Standard Model, MSSM, and beyond.

Generates complete physical events compatible with detector simulations.

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.