Top Physics in WHIZARD

TL;DR

This paper summarizes the implementation of top quark physics processes in the WHIZARD event generator, emphasizing lepton collider applications, including advanced calculations like NLO QCD and threshold resummation techniques.

Contribution

It introduces new features in WHIZARD for simulating complex top quark processes, including threshold effects and spin correlations, enhancing precision for collider studies.

Findings

Implementation of full multi-fermion processes in WHIZARD

Inclusion of NLO QCD processes for top quarks

Specialized treatment of top-quark pair threshold region

Abstract

In this talk we summarize the top physics setup in the event generator WHIZARD with a main focus on lepton colliders. This includes full six-, eight- and ten-fermion processes, factorized processes and spin correlations. For lepton colliders, QCD NLO processes for top quark physics are available and will be discussed. A special focus is on the top-quark pair threshold, where a special implementation combines a non-relativistic effective field theory calculation augmented by a next-to-leading threshold logarithm resummation with a continuum relativistic fixed-order QCD NLO simulation.