Collider Interplay for Supersymmetry, Higgs and Dark Matter

TL;DR

This paper evaluates the future collider prospects for discovering or constraining supersymmetry within the CMSSM framework, focusing on LHC, electron-positron, and proton-proton colliders, and discusses how various measurements can test the model.

Contribution

It provides detailed estimates of the physics reach for supersymmetry detection and parameter determination at future colliders, including LHC, FCC-ee, CLIC, and FCC-hh, within the CMSSM.

Findings

LHC MET searches can cover low-mass CMSSM regions.

Future colliders can precisely measure sparticle masses.

Electroweak and Higgs measurements can test CMSSM at loop level.

Abstract

We discuss the potential impacts on the CMSSM of future LHC runs and possible electron-positron and higher-energy proton-proton colliders, considering searches for supersymmetry via MET events, precision electroweak physics, Higgs measurements and dark matter searches. We validate and present estimates of the physics reach for exclusion or discovery of supersymmetry via MET searches at the LHC, which should cover the low-mass regions of the CMSSM parameter space favoured in a recent global analysis. As we illustrate with a low-mass benchmark point, a discovery would make possible accurate LHC measurements of sparticle masses using the MT2 variable, which could be combined with cross-section and other measurements to constrain the gluino, squark and stop masses and hence the soft supersymmetry-breaking parameters m_0, m_{1/2} and A_0 of the CMSSM. Slepton measurements at CLIC would enable m_0 and m_{1/2} to be determined with high precision. If supersymmetry is indeed discovered in the low-mass region, precision electroweak and Higgs measurements with a future circular electron-positron collider (FCC-ee, also known as TLEP) combined with LHC measurements would provide tests of the CMSSM at the loop level. If supersymmetry is not discovered at the LHC, is likely to lie somewhere along a focus-point, stop coannihilation strip or direct-channel A/H resonance funnel. We discuss the prospects for discovering supersymmetry along these strips at a future circular proton-proton collider such as FCC-hh. Illustrative benchmark points on these strips indicate that also in this case FCC-ee could provide tests of the CMSSM at the loop level.