Sensitivity of the decay $h\to ZZ^*\to Zl+l-$ to the Higgs self coupling through radiative corrections

TL;DR

This paper investigates how radiative corrections in the decay process $h o ZZ^* o Zl+l-$ can reveal the value of the Higgs self-coupling, offering a new method to test Higgs interactions beyond the Standard Model.

Contribution

It demonstrates the potential sensitivity of the decay process to the Higgs self-coupling in both the Standard Model and 2HDM through radiative corrections.

Findings

Corrections can reach a few percent in the 2HDM.

Decay width corrections are sensitive to the Higgs self-coupling.

Provides a new avenue for probing Higgs self-interactions.

Abstract

We study the radiative corrections induced by the triple Higgs boson coupling $hhh$ in the three body decay $h\to ZZ^*\to Zl\bar l$. We show that these corrections are potentially sensitive to the specific value of this coupling in the Standard Model and the Two Higgs Doublet Model (2HDM). These effects may induce corrections to the integrated decay width of the three-body decay of order few percent in the 2HDM and thus open a new window to test the Higgs boson self interaction in physics beyond the standard model.