Stealth Supersymmetry Simplified

TL;DR

This paper introduces simplified models of Stealth Supersymmetry that reveal new decay patterns and show that certain superpartners, especially stops, can be lighter and less constrained than in traditional models, impacting LHC search strategies.

Contribution

The paper develops simplified models within Natural Supersymmetry that highlight unique decay topologies and demonstrate that existing LHC searches are less effective for Stealth Supersymmetry, especially for stops.

Findings

Gluinos can be lighter than 1 TeV in Stealth Supersymmetry.

Existing searches strongly constrain some gluino topologies.

Novel stop decay modes are largely unconstrained by current LHC data.

Abstract

In Stealth Supersymmetry, bounds on superpartners from direct searches can be notably weaker than in standard supersymmetric scenarios, due to suppressed missing energy. We present a set of simplified models of Stealth Supersymmetry that motivate 13 TeV LHC searches. We focus on simplified models within the Natural Supersymmetry framework, in which the gluino, stop, and Higgsino are assumed to be lighter than other superpartners. Our simplified models exhibit novel decay patterns that differ significantly from topologies of the Minimal Supersymmetric Standard Model, with and without $R$-parity. We determine limits on stops and gluinos from searches at the 8 TeV LHC. Existing searches constitute a powerful probe of Stealth Supersymmetry gluinos with certain topologies. However, we identify simplified models where the gluino can be considerably lighter than 1 TeV. Stops are significantly less constrained in Stealth Supersymmetry than the MSSM, and we have identified novel stop decay topologies that are completely unconstrained by existing LHC searches.