New Supersoft Supersymmetry Breaking Operators and a Solution to the $\mu$ Problem

TL;DR

This paper introduces a new framework called 'generalized supersoft supersymmetry breaking' that addresses key issues in supersoft models, including the $mbda$ problem and Higgs mass, by adding novel operators that allow for more flexible Higgs and Higgsino mass configurations.

Contribution

It proposes new operators in supersoft models that resolve the $mbda$ problem, enable a 125 GeV Higgs, and allow for heavier Higinos without fine-tuning.

Findings

New operators can generate a natural $mbda$ term.

The framework achieves a 125 GeV Higgs mass.

Higgsinos can be much heavier than the Higgs boson.

Abstract

We propose the framework, "generalized supersoft supersymmetry breaking". "Supersoft" models, with $D$-type supersymmetry breaking and heavy Dirac gauginos, are considerably less constrained by the LHC searches than the well studied MSSM. These models also ameliorate the supersymmetric flavor and $CP$ problems. However, previously considered mechanisms for obtaining a natural size Higgsino mass parameter (namely, $\mu$) in supersoft models have been relatively complicated and contrived. Obtaining a $125\gev$ for the mass of the lightest Higgs boson has also been difficult. Additional issues with the supersoft scenario arise from the fact that these models contain new scalars in the adjoint representation of the standard model, which may obtain negative squared-masses, breaking color and generating too large a $T$-parameter. In this work we introduce new operators into supersoft models which can potentially solve all these issues. A novel feature of this framework is that the new $\mu$-term can give unequal masses to the up and down type Higgs fields, and the Higgsinos can be much heavier than the Higgs boson without fine-tuning. However, unequal Higgs and Higgsino masses also remove some attractive features of supersoft susy.