Decoupling property of the supersymmetric Higgs sector with four doublets

TL;DR

This paper investigates how additional heavy Higgs doublets in a supersymmetric model can influence predictions of the minimal supersymmetric standard model, especially when these extra fields are too heavy to detect directly.

Contribution

It provides formulas for deviations in MSSM observables due to heavy extra Higgs doublets and analyzes their phenomenological implications.

Findings

Heavy Higgs doublets can significantly alter MSSM Higgs mass predictions.

B-term mixing affects Higgs mixing angles and observable quantities.

Deviations are numerically examined for potential collider phenomenology.

Abstract

In supersymmetric standard models with multi Higgs doublet fields, selfcoupling constants in the Higgs potential come only from the D-terms at the tree level. We investigate the decoupling property of additional two heavier Higgs doublet fields in the supersymmetric standard model with four Higgs doublets. In particular, we study how they can modify the predictions on the quantities well predicted in the minimal supersymmetric standard model (MSSM), when the extra doublet fields are rather heavy to be measured at collider experiments. The B-term mixing between these extra heavy Higgs bosons and the relatively light MSSM-like Higgs bosons can significantly change the predictions in the MSSM such as on the masses of MSSM-like Higgs bosons as well as the mixing angle for the two light CP-even scalar states. We first give formulae for deviations in the observables of the MSSM in the decoupling region for the extra two doublet fields. We then examine possible deviations in the Higgs sector numerically, and discuss their phenomenological implications.