Progress in top-pair production at hadron colliders

TL;DR

This paper reviews recent NNLO QCD calculations for top-pair production at hadron colliders, analyzing the size and convergence of higher-order corrections and comparing K-factors at the Tevatron.

Contribution

It provides a comprehensive comparison of NNLO, NLO, and LO results for top-pair production, highlighting the impact of higher-order corrections and their convergence.

Findings

NNLO corrections significantly affect top-pair production predictions

Comparison shows improved convergence of the perturbative series at NNLO

K-factors at NNLO differ notably from NLO, especially at the Tevatron

Abstract

We review recently derived NNLO QCD results for top-pair production at hadron colliders. We compare the size of the NNLO corrections in $q\bar q\to t\bar t+X$ with the LO and NLO ones, and address the question of convergence of perturbative series. We compare the NLO and NNLO K-factors for the Tevatron.