Tan(beta) enhanced Yukawa couplings for supersymmetric Higgs singlets at one loop

TL;DR

This paper investigates how one-loop tan(beta)-enhanced Yukawa couplings influence the phenomenology of gauge singlet Higgs bosons in supersymmetric models, highlighting their potential dominance in decay modes.

Contribution

It introduces an effective Lagrangian capturing these couplings and analyzes their impact on singlet Higgs boson phenomenology in the mnSSM and NMSSM.

Findings

Loop-induced couplings significantly affect singlet pseudoscalar decays.

Enhanced Yukawa couplings can dominate decay modes in certain parameter regions.

The effective Lagrangian provides a useful tool for phenomenological studies.

Abstract

Extensions of the MSSM generically feature gauge singlet Higgs bosons. These singlet Higgs bosons have tan(beta)-enhanced Yukawa couplings to down-type quarks and leptons at the one-loop level. We present an effective Lagrangian incorporating these Yukawa couplings and use it to study their effect on singlet Higgs boson phenomenology within both the mnSSM and NMSSM. It is found that the loop-induced couplings represent an appreciable effect for the singlet pseudoscalar in particular, and may dominate its decay modes in some regions of parameter space.