A Supersymmetric One Higgs Doublet Model

TL;DR

This paper introduces a supersymmetric model with a single Higgs doublet responsible for fermion masses, reducing issues like proton decay and flavor violations, and predicts a very light bino-like neutralino as the LSP.

Contribution

It presents a minimal supersymmetric extension with one Higgs doublet, incorporating an anomaly-free R-symmetry and adjoint superfields, offering advantages over the MSSM.

Findings

Predicts a very light bino-like neutralino as the LSP

Ameliorates proton decay and flavor violation problems

Discusses potential LHC discovery signatures

Abstract

We present a supersymmetric extension of the Standard Model in which only one electroweak doublet acquires a vacuum expectation value and gives mass to Standard Model fermions. As well as the novel accommodation of a Standard Model Higgs within a supersymmetric framework, this leads to a very predictive model, with some advantages over the MSSM. In particular, problems with proton decay, flavour changing neutral currents and large CP violation are ameliorated, primarily due to the presence of an anomaly-free R-symmetry. Since supersymmetry must be broken at a low scale, gravity-mediated effects which break the R-symmetry are naturally small. The R-symmetry requires the presence of adjoint chiral superfields, to give Dirac masses to the gauginos; these adjoints are the only non-MSSM fields in the visible sector. The LSP is a very light neutralino, which is mostly bino. Such a light neutralino is not in conflict with experiment, and is a striking prediction of the minimal model. Additional scenarios to raise the mass of this neutralino to the weak scale are also outlined. Prospects for discovery at the LHC are briefly discussed, along with viable scenarios for achieving gauge-coupling unification.