Higgs effects in top anti-top production near threshold in e+ e- annihilation

TL;DR

This paper combines advanced QCD calculations with Higgs effects to analyze top-antitop production near threshold, assessing the impact of Higgs interactions and potential new physics on the cross section.

Contribution

It presents the first combined analysis of third-order QCD, Higgs effects, QED, and non-resonant contributions in top pair production near threshold.

Findings

Higgs effects significantly influence the cross section.

The combined calculation improves theoretical precision.

Sensitivity to top-quark Yukawa coupling variations is evaluated.

Abstract

The completion of the third-order QCD corrections to the inclusive top-pair production cross section near threshold demonstrates that the strong dynamics is under control at the few percent level. In this paper we consider the effects of the Higgs boson on the cross section and, for the first time, combine the third-order QCD result with the third-order P-wave, the leading QED and the leading non-resonant contributions. We study the size of the different effects and investigate the sensitivity of the cross section to variations of the top-quark Yukawa coupling due to possible new physics effects.