Non-Simplified SUSY: stau-Coannihilation at LHC and ILC

TL;DR

This paper critically examines the limitations of simplified SUSY models by analyzing full SUSY scenarios with small stau-LSP mass differences, highlighting the complementary discovery potential of LHC and ILC.

Contribution

It demonstrates the applicability and limitations of simplified models for full SUSY scenarios, emphasizing the importance of detailed simulations for accurate interpretation.

Findings

LHC can discover parts of the spectrum but not all.

ILC offers significant additional discovery and property determination.

Simplified models may not fully capture the complexity of full SUSY scenarios.

Abstract

Simplified models have become a widely used and important tool to cover the more diverse phenomenology beyond constrained SUSY models. However, they come with a substantial number of caveats themselves, and great care needs to be taken when drawing conclusions from limits based on the simplified approach. To illustrate this issue with a concrete example, we examine the applicability of simplified model results to a series of full SUSY model points which all feature a small stau-LSP mass difference, and are compatible with electroweak and flavor precision observables as well as current LHC results. Various channels have been studied using the Snowmass Combined LHC detector implementation in the Delphes simulation package, as well as the Letter of Intent or Technical Design Report simulations of the ILD detector concept at the ILC. We investigated both the LHC and ILC capabilities for discovery, separation and identification of all parts of the spectrum. While parts of the spectrum would be discovered at the LHC, there is substantial room for further discoveries and property determination at the ILC.