The Supersymmetric Leptophilic Higgs Model

TL;DR

This paper explores a supersymmetric leptophilic Higgs model with four doublets, analyzing its constrained Higgs sector, and finds that the lightest Higgs can be lighter than 114 GeV with distinctive decay properties, but is heavily constrained by existing bounds.

Contribution

It provides a detailed analysis of the supersymmetric leptophilic Higgs model's Higgs sector, including mass bounds and decay modes, under various theoretical and experimental constraints.

Findings

Lightest Higgs can be below 114 GeV with enhanced tau decay

Second lightest Higgs around 110 GeV with SM-like couplings

Heavier Higgs are gauge-phobic with distinct decay channels

Abstract

In the leptophilic model, one Higgs doublet couples to quarks and another couples to leptons. We study the supersymmetric version of this model, concentrating on the tightly constrained Higgs sector, which has four doublets. Constraints from perturbativity, unitarity, and LEP bounds are considered. It is found that the lightest Higgs, h, can have a mass well below 114 GeV, and for masses below 100 GeV will have a substantially enhanced branching ratio into tau pairs. For this region of parameter space, traditional production mechanisms (Higgs-strahlung, W fusion and gluon fusion) are suppressed, but it may be produced in the decay of heavier particles. The second lightest Higgs has a mass of approximately 110 GeV for virtually all of parameter space, with Standard Model couplings, and thus an increase of a few GeV in the current lower bound on the Standard Model Higgs mass would rule out the model. The two heavier Higgs are both gauge-phobic, one decays almost entirely into b pairs and can be produced via gluon fusion while the other decays almost entirely into tau pairs but can't be easily produced.