$tWZ$ production at NLO in QCD in the SMEFT

TL;DR

This paper discusses the calculation of $tWZ$ production at NLO in QCD, addressing interference issues with related processes and providing predictions within the Standard Model and SMEFT frameworks.

Contribution

It introduces a diagram-removal method to define $tWZ$ production at NLO and presents predictions in both the Standard Model and SMEFT including dimension-six operators.

Findings

Developed a method to disentangle overlapping processes at NLO

Provided Standard Model and SMEFT predictions for $tWZ$ production

Analyzed the impact of SMEFT operators on $tWZ$ cross sections

Abstract

At NLO in QCD, the $tWZ$ production process interferes with resonant LO processes, $t\bar{t}Z$ and $t\bar{t}$, and a method to meaningfully disentangle these overlapping processes needs to be employed. I discuss the diagram-removal procedure needed to obtain an operative definition of $tWZ$ at NLO accuracy. I also show the predictions we obtain in the context of the Standard Model and in the Standard Model Effective Field Theory including the relevant dimension-six SMEFT operators.