Full off-shell $t\bar{t}$ production in the semileptonic channel at the LHC

TL;DR

This paper presents comprehensive NLO predictions for off-shell top quark pair production in the semileptonic channel at the LHC, including all relevant corrections and effects for accurate cross-section calculations.

Contribution

It provides the first complete NLO calculation of off-shell $t\bar{t}$ production with full electroweak and QCD corrections, including finite-width, interference, and singularity treatments.

Findings

Fiducial cross sections at 13.6 TeV are computed.

Differential distributions show significant off-shell effects.

Electroweak corrections impact the high-energy tails.

Abstract

In this contribution, we summarize our results on the complete NLO predictions for the production of off-shell top quark pairs in the $\ell+j$ channel at the LHC. All NLO QCD and electroweak corrections are consistently included across the full set of LO contributions and partonic subprocesses, while retaining finite-width effects of the top quarks and the electroweak gauge bosons. Resonant and non-resonant contributions as well as interference effects are included in the complete calculation. We pay special attention to infrared singularities associated with photons and jets appearing simultaneously in the final state. Fiducial integrated and differential cross-section results are presented for $pp$ collisions at $\sqrt{s}=13.6$ TeV.