Electroweak baryogenesis and the triple Higgs boson coupling

TL;DR

This paper investigates how electroweak baryogenesis affects the triple Higgs boson coupling in two Higgs doublet and supersymmetric models, highlighting potential detectable deviations at future colliders.

Contribution

It demonstrates that electroweak baryogenesis induces significant deviations in the Higgs trilinear coupling, which can be observed at future electron-positron colliders.

Findings

Deviations in the Higgs triple coupling exceed 10% in the two Higgs doublet model.

Large quantum corrections to the Higgs coupling are linked to a strongly first order electroweak phase transition.

Potential detection of these deviations at future linear colliders.

Abstract

We study collider signatures of electroweak baryogenesis in the two Higgs doublet model and the minimal supersymmetric standard model. It is found that the trilinear coupling of the lightest Higgs boson receives large quantum corrections if the electroweak phase transition is strongly first order for successful baryogenesis. In the two Higgs doublet model, the magnitude of the deviation from the standard model value is shown to be larger than 10 percent. Such a deviation can be detected at a future electron-positron linear collider.