Full off-shell predictions and $b$-jet definitions for $t\bar{t}b\bar{b}$ at NLO in QCD

TL;DR

This paper provides comprehensive NLO QCD predictions for $t\bar{t}b\bar{b}$ production at the LHC, including off-shell effects and uncertainties, and compares them with experimental data to improve understanding of top quark and b-jet processes.

Contribution

It offers the first complete NLO QCD predictions for $t\bar{t}b\bar{b}$ with full off-shell effects and detailed uncertainty analysis, enhancing theoretical precision for LHC studies.

Findings

Predictions align well with experimental measurements.

Off-shell effects significantly impact the cross-section calculations.

$b$-quark initiated subprocesses have notable contributions.

Abstract

In this proceeding we present predictions for the complete NLO QCD corrections to the production of $t\bar{t}b\bar{b}$ in the dilepton decay channel of the top quark at the LHC with $\sqrt{s}=13$ TeV. The calculation is performed considering all the full off-shell effects. Moreover, the various sources of uncertainty for this process are studied in detail. We then compare these predictions to experimental measurements. We additionally investigate the impact of the $b$-quark initiated subprocesses.