New developments on the WHIZARD event generator

TL;DR

This paper reports recent updates to the WHIZARD event generator, including new automation features, process handling, interface improvements, bug fixes, and plans for future enhancements in collider simulations.

Contribution

It introduces new NLO electroweak automation, loop-induced process handling, and improved matching techniques in WHIZARD, advancing its capabilities for collider event simulation.

Findings

Enhanced NLO electroweak automation for $e^+e^-$ colliders

Implementation of loop-induced processes and POWHEG matching

Bug fixes improving Monte Carlo mass production reliability

Abstract

We give a status report on new developments in the WHIZARD event generator, including NLO electroweak automation for $e^+e^-$ colliders, loop-induced processes, POWHEG matching, new features in the UFO interface and the current development for matching between exclusive photon radiation and fixed-order LO/NLO electroweak (EW) corrections. We report on several bug fixes relevant for certain aspects of the ILC250 Monte Carlo (MC) mass production, especially on the normalization of matching EPA samples with full-matrix element samples. Finally, we mention some ongoing work on efficiency improvements regarding parallelization of matrix elements and phase space sampling, as well as plans to revive the top threshold simulation.