The right top coupling in the aligned two-Higgs-doublet model

TL;DR

This paper calculates the right top quark coupling in the aligned two-Higgs-doublet model, revealing potential enhancements over the Standard Model predictions for both real and imaginary parts at one-loop level.

Contribution

It provides the first detailed one-loop analytical computation of the right top coupling in the aligned two-Higgs-doublet model, highlighting possible significant deviations from the Standard Model.

Findings

Imaginary part can be up to ten times larger than electroweak prediction.

Real part can be up to a thousand times larger than the Standard Model.

Detailed analytical expressions for the one-loop corrections are provided.

Abstract

We compute the right top quark coupling in the aligned two-Higgs-doublet model. In the Standard Model the real part of this coupling is dominated by QCD-gluon-exchange diagram, but the imaginary part, instead, is purely electroweak at one loop. Within this model we show that values for the imaginary part of the coupling up to one order of magnitude larger than the electroweak prediction can be obtained. For the real part of the electroweak contribution we find that it can be up to three orders of magnitude larger than the standard model one. We also present detailed results of the one loop analytical computation.