Refining two-loop corrections to trilinear Higgs couplings in the Two-Higgs-Doublet Model

TL;DR

This paper calculates leading two-loop corrections to trilinear Higgs couplings in the Two-Higgs-Doublet Model, crucial for precise Higgs self-coupling measurements and understanding scalar sector stability.

Contribution

It provides new two-loop correction results for key Higgs couplings in the 2HDM, addressing renormalisation and phenomenological implications.

Findings

Two-loop corrections significantly affect Higgs pair production predictions.

Renormalisation of the alignment limit is clarified in the Higgs basis.

Results impact future collider measurements of Higgs self-couplings.

Abstract

The precise determination of the Higgs self-couplings is an essential task for understanding electroweak symmetry breaking and probing physics beyond the Standard Model (SM). The calculation of two-loop corrections to scalar couplings is important as it provides a critical test of the perturbative stability of the theoretical predictions, especially in scenarios with extended scalar sectors where large one-loop corrections can occur. Moreover, two-loop corrections need to be taken into account for the future perspective of precisely measuring the trilinear Higgs self-coupling. We present new results for the leading two-loop corrections to trilinear Higgs couplings in the Two-Higgs-Doublet Model (2HDM). We focus in particular on the couplings $\lambda_{hhh}$ and $\lambda_{hhH}$, which are relevant for Higgs pair production at the (HL-)LHC or at future linear colliders. We address the renormalisation of the alignment limit in the Higgs basis and give some insights into technical details of the calculation. Finally, we discuss the phenomenological impact of our results on di-Higgs production differential distributions.