Higher-order corrections to top-quark pair production in the SMEFT

TL;DR

This paper provides approximate NNLO QCD predictions for top-quark pair production at the LHC within the SMEFT framework, focusing on the chromomagnetic dipole operator, with significant corrections reducing uncertainties.

Contribution

It introduces approximate NNLO calculations including higher-order soft gluon corrections for top-quark pair production in the SMEFT, enhancing theoretical precision.

Findings

Higher-order corrections are large and reduce scale uncertainties.

Results enable stronger bounds on top-quark anomalous couplings.

Approximate NNLO predictions improve theoretical accuracy for LHC analyses.

Abstract

We present theoretical results at approximate NNLO in QCD for top-quark pair-production total cross sections and top-quark differential distributions at the LHC in the SMEFT. In this work we consider effects of new physics parametrized by the chromomagnetic dipole operator. These approximate results are obtained by adding higher-order soft gluon corrections to the complete NLO calculations. The higher-order corrections are large, and they reduce the scale uncertainties. These improved theoretical predictions can be used to set stronger bounds on top-quark QCD anomalous couplings.