Study of Higgs self couplings of a supersymmetric $E_6$ model at the International Linear Collider

TL;DR

This paper investigates the Higgs self couplings in a supersymmetric $E_6$ model, analyzing their potential observability at the ILC through double Higgs-strahlung, considering radiative corrections and experimental constraints.

Contribution

It provides a detailed analysis of Higgs self couplings in an $E_6$ supersymmetric model and assesses their detectability at the ILC, including radiative corrections and experimental feasibility.

Findings

Lightest Higgs boson may be heavier than 112 GeV.

At least 5 Higgs events expected at ILC with specified parameters.

Higgs self couplings could be observed via double Higgs-strahlung at the ILC.

Abstract

We study the Higgs self couplings of a supersymmetric $E_6$ model that has two Higgs doublets and two Higgs singlets. The lightest scalar Higgs boson in the model may be heavier than 112 GeV, at the one-loop level, where the negative results for the Higgs search at the LEP2 experiments are taken into account. The contributions from the top and scalar top quark loops are included in the radiative corrections to the one-loop mass of the lightest scalar Higgs boson, in the effective potential approximation. The effect of the Higgs self couplings may be observed in the production of the lightest scalar Higgs bosons in $e^+e^-$ collisions at the International Linear Collider (ILC) via double Higgs-strahlung process. For the center of mass energy of 500 GeV with the integrated luminosity of 500 fb$^{-1}$ and the efficiency of 20 %, we expect that at least 5 events of the lightest scalar Higgs boson may be produced at the ILC via double Higgs-strahlung process.