hhh Coupling in SUSY models after LHC run I

TL;DR

This paper analyzes the Higgs triple coupling in MSSM and NMSSM models considering current experimental constraints, finding that the MSSM coupling remains close to the Standard Model, while the NMSSM can significantly deviate, with future measurements expected to tighten these bounds.

Contribution

It provides the first detailed analysis of the Higgs triple coupling in MSSM and NMSSM under comprehensive current constraints, highlighting potential deviations and future experimental prospects.

Findings

MSSM Higgs triple coupling ratio above 0.97 of SM

NMSSM ratio can reach 0.1 of SM

Future colliders will tighten constraints on Higgs couplings

Abstract

We examine the Higgs triple coupling in MSSM and NMSSM under current constraints, which include the LHC measurements, Higgs data, B physics, electroweak precision observables, relic density and so on. The ratio $\lambda^{\rm MSSM}_{hhh}/\lambda^{\rm SM}_{hhh}$ is above 0.97, due to the highly constrained parameter space. While the ratio $\lambda^{\rm NMSSM}_{hhh}/\lambda^{\rm SM}_{hhh}$ can reach 0.1 under current constraints. The precise measurement in future collider will give a tighter constraint to the Higgs triple coupling in MSSM and NMSSM.