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

TL;DR

This paper explores how combined measurements from the LHC and ILC can improve the discovery and analysis of supersymmetric particles, especially in scenarios with small stau_1-LSP mass differences, enhancing understanding of new physics beyond the Standard Model.

Contribution

It demonstrates the complementary roles of LHC and ILC in discovering and analyzing SUSY particles, emphasizing the importance of combined data for detailed spectrum analysis.

Findings

Some SUSY particles could be discovered at the LHC.

The ILC can discover additional particles not accessible at the LHC.

Precise ILC measurements can refine LHC data interpretation.

Abstract

If new phenomena beyond the Standard Model will be discovered at the LHC, the properties of the new particles could be determined with data from the High-Luminosity LHC and from a future linear collider like the ILC. We discuss the possible interplay between measurements at the two accelerators in a concrete example, namely a full SUSY model which features a small stau_1-LSP mass difference. Various channels have been studied using the Snowmass 2013 combined LHC detector implementation in the Delphes simulation package, as well as simulations of the ILD detector concept from the Technical Design Report. We investigate both the LHC and ILC capabilities for discovery, separation and identification of various parts of the spectrum. While some parts would be discovered at the LHC, there is substantial room for further discoveries at the ILC. We finally highlight examples where the precise knowledge about the lower part of the mass spectrum which could be acquired at the ILC would enable a more in-depth analysis of the LHC data with respect to the heavier states.