NLO QCD corrections to top anti-top bottom anti-bottom production at the LHC

TL;DR

This paper calculates NLO QCD corrections to tTbB production at the LHC, showing that previous estimates underestimated the cross section and proposing a new scale choice for more accurate predictions.

Contribution

It introduces a new dynamical scale that stabilizes NLO predictions and improves the accuracy of tTbB production simulations at the LHC.

Findings

NLO corrections double the estimated cross section.

A new scale choice stabilizes perturbative predictions.

Enhanced computational techniques for six-particle one-loop amplitudes.

Abstract

The next-to-leading order (NLO) QCD corrections to top anti-top bottom anti-bottom (tTbB) production at the LHC reveal that the scale choice adopted in previous lowest-order simulations underestimates the tTbB cross section by a factor two. We discuss a new dynamical scale that stabilizes the perturbative predictions and describe the impact of the corrections on the shape of distributions. We also account for the techniques employed to compute the six-particle one-loop amplitudes with high CPU efficiency.