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O'Mega & WHIZARD: Monte Carlo Event Generator Generation For Future Colliders

Thorsten Ohl

TL;DR

The paper tackles the combinatorial and numerical challenges of multi-particle final states at future linear colliders. It presents O'Mega, which factorizes tree-level amplitudes using 1POWs to suppress diagrammatic redundancy and produce efficient code, and WHIZARD, which automates phase-space parametrizations and adaptive multi-channel Monte Carlo sampling (via VAMP) while interfacing with external matrix-element generators. The combined framework enables automated generation of unweighted event generators for complex processes, demonstrated through vector boson scattering and Higgsstrahlung with substantial improvements in cross-section accuracy and event-generation efficiency. This work enhances robustness, scalability, and practicality of collider phenomenology and simulation workflows.

Abstract

I describe the optimizing matrix element generator O'Mega and Wolfgang Kilian's event generator generator WHIZARD. These tools cooperate in the automated production of efficient unweighted event generators for linear collider physics.

O'Mega & WHIZARD: Monte Carlo Event Generator Generation For Future Colliders

TL;DR

The paper tackles the combinatorial and numerical challenges of multi-particle final states at future linear colliders. It presents O'Mega, which factorizes tree-level amplitudes using 1POWs to suppress diagrammatic redundancy and produce efficient code, and WHIZARD, which automates phase-space parametrizations and adaptive multi-channel Monte Carlo sampling (via VAMP) while interfacing with external matrix-element generators. The combined framework enables automated generation of unweighted event generators for complex processes, demonstrated through vector boson scattering and Higgsstrahlung with substantial improvements in cross-section accuracy and event-generation efficiency. This work enhances robustness, scalability, and practicality of collider phenomenology and simulation workflows.

Abstract

I describe the optimizing matrix element generator O'Mega and Wolfgang Kilian's event generator generator WHIZARD. These tools cooperate in the automated production of efficient unweighted event generators for linear collider physics.

Paper Structure

This paper contains 4 sections, 1 equation, 2 figures.

Table of Contents

  1. Introduction
  2. O'Mega
  3. WHIZARD
  4. Applications

Figures (2)

  • Figure 1: The event generator generator WHIZARD provides phase space parametrizations and utilizes external components for matrix element generation and adaptive multi channel Monte Carlo sampling.
  • Figure 2: Distributions of 10000 unweighted$e^-e^+\to \nu_e\bar{\nu}_e b\bar{b}$ events at $\sqrt{s}=350\;\textrm{GeV}$ for $m_H=120\;\textrm{GeV}$, corresponding to $16.68\,\textrm{fb}^{-1}$.