Supersymmetry at a 28 TeV hadron collider: HE-LHC

Abstract

The discovery of the Higgs boson at $\sim 125$ GeV indicates that the scale of weak scale supersymmetry is higher than what was perceived in the pre-Higgs boson discovery era and lies in the several TeV region. This makes the discovery of supersymmetry more challenging and argues for hadron colliders beyond LHC at $\sqrt{s}=14$ TeV. The Future Circular Collider (FCC) study at CERN is considering a 100 TeV collider to be installed in a 100 km tunnel in the Lake Geneva basin. Another 100 km collider being considered in China is the Super proton-proton Collider (SppC). A third possibility recently proposed is the High-Energy LHC (HE-LHC) which would use the existing CERN tunnel but achieve a center-of-mass energy of 28 TeV by using FCC magnet technology at significantly higher luminosity than at the High Luminosity LHC (HL-LHC). In this work we investigate the potential of HE-LHC for the discovery of supersymmetry. We study a class of supergravity unified models under the Higgs boson mass and the dark matter relic density constraints and compare the analysis with the potential reach of the HL-LHC. A set of benchmarks are presented which are beyond the discovery potential of HL-LHC but are discoverable at HE-LHC. For comparison, we study model points at HE-LHC which are also discoverable at HL-LHC. For these model points, it is found that their discovery would require a HL-LHC run between 5-8 years while the same parameter points can be discovered in a period of few weeks to $\sim 1.5$ yr at HE-LHC running at its optimal luminosity of $2.5\times 10^{35}$ cm${}^{-2}$ s${}^{-1}$. The analysis indicates that the HE-LHC possibility should be seriously pursued as it would significantly increase the discovery reach for supersymmetry beyond that of HL-LHC and decrease the run period for discovery.

29 pages, 7 figures Accepted for publication in PRD

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• What Fermilab $(g-2{)}_{\mu }$ experiment tells us about discovering SUSY at HL-LHC and HE-LHC
• LHC luminosity and energy upgrades confront natural supersymmetry models
• GUT-inspired MSSM in light of muon $g-2$ and LHC results at $\sqrt{s}=13$ TeV
• Dark Matter Blind Spots at One-Loop
• Naturalness, the Hyperbolic Branch and Prospects for the Observation of Charged Higgs at High Luminosity LHC and 27 TeV LHC
• Detecting hidden sector dark matter at HL-LHC and HE-LHC via long-lived stau decays
• On the coverage of neutralino dark matter in coannihilations at the upgraded LHC
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• A long-lived stop with freeze-in and freeze-out dark matter in the hidden sector
• Two natural scenarios for dark matter particles coexisting with supersymmetry
• Corrections to Yukawa couplings from higher dimensional operators in a natural SUSY $\mathsf{SO}(10)$ and HL-LHC implications
• Expanding the parameter space of natural supersymmetry
• SUSY Signals from QCD Production at the Upgraded LHC
• High Energy Physics and Cosmology at the Unification Frontier: Opportunities and Challenges in the coming years
• LHC phenomenology with hidden sector dark matter: a long-lived stau and heavy Higgs in an observable range