$t\bar{t}t\bar{t}$: NLO QCD corrections in production and decays for the $4\ell$ channel

TL;DR

This paper presents NLO QCD corrections for four top-quark production in the 4-lepton decay channel, including both production and decay processes, with a focus on spin correlations and the impact of higher-order effects.

Contribution

The study provides the first NLO QCD corrections to both production and decay of four top-quarks in the 4-lepton channel, maintaining spin correlations using the narrow-width approximation.

Findings

NLO QCD corrections significantly affect the production cross section.

Neglecting higher-order effects in decays can lead to inaccuracies.

Spin correlations are preserved at NLO accuracy.

Abstract

We briefly summarise the results for the four top-quark production process in the 4$\ell$ decay channel at NLO accuracy in perturbative QCD. We employ the narrow-width approximation for the treatment of the unstable particles, preserving spin correlations to NLO accuracy throughout our computations. The NLO QCD corrections are applied to both the production and decays of the four tops. We investigate the overall size of the NLO QCD corrections and the impact of neglecting higher-order effects in top-quark decays.