Supersymmetric models with light higgsinos

TL;DR

This paper discusses models where light higgsinos coexist with heavy supersymmetric particles, motivated by string theory, and explores their implications for collider detection and Higgs mass predictions.

Contribution

It introduces a class of gauge-mediated SUSY breaking models with high messenger scales that naturally produce light higgsinos and heavy squarks and gluinos.

Findings

Light higgsinos are challenging to detect at the LHC.

Higgs masses are consistent with 124-126 GeV.

Models predict heavy squarks and gluinos with TeV-scale masses.

Abstract

In the Minimal Supersymmetric Standard Model, the higgsinos can have masses around the electroweak scale, while the other supersymmetric particles have TeV-scale masses. This happens in models of gauge-mediated SUSY breaking with a high messenger scale, which are motivated from string theory. For particular choices of the messenger field content, multi-TeV squark and gluino masses naturally lead to a much lower electroweak scale, somewhat similar to focus point supersymmetry. They also induce Higgs masses of 124-126 GeV, while making the discovery of supersymmetry at the LHC unlikely. The light higgsinos will be difficult to see at the LHC but may eventually be discovered at a linear collider.