Stealth Supersymmetry

TL;DR

This paper introduces a class of supersymmetric models that do not produce missing energy signatures, featuring nearly degenerate particles and unique collider signals like jet-rich events and resonances.

Contribution

The paper proposes a broad class of R-parity conserving SUSY models with small mass splittings, leading to distinctive collider signatures without missing energy.

Findings

Models predict jet-rich events with false resonances

Possible discovery modes include gamma + jet + jet resonances

Scenarios are consistent with gauge coupling unification

Abstract

We present a broad class of supersymmetric models that preserve R-parity but lack missing energy signatures. These models have new light particles with weak-scale supersymmetric masses that feel SUSY breaking only through couplings to the MSSM. This small SUSY breaking leads to nearly degenerate fermion/boson pairs, with small mass splittings and hence small phase space for decays carrying away invisible energy. The simplest scenario has low-scale SUSY breaking, with missing energy only from soft gravitinos. This scenario is natural, lacks artificial tunings to produce a squeezed spectrum, and is consistent with gauge coupling unification. The resulting collider signals will be jet-rich events containing false resonances that could resemble signatures of R-parity violation. We discuss several concrete examples of the general idea, and emphasize gamma + jet + jet resonances, displaced vertices, and very large numbers of b-jets as three possible discovery modes.