The LHC higgsino discovery plane for present and future SUSY searches
arXiv:2007.09252 · doi:10.1016/j.physletb.2020.135777
Abstract
Considerations from electroweak naturalness and stringy naturalness imply a little hierarchy in supersymmetric models where the superpotential higgsino mass parameter mu is of order the weak scale whilst the soft SUSY breaking terms may be in the (multi-) TeV range. In such a case, discovery of SUSY at LHC may be most likely in the higgsino pair production channel. Indeed, ATLAS and CMS are performing searches in the higgsino mass discovery plane of m(chi_2^0) vs. Δm^0 = m(chi_2^0)-m(chi_1^0). We examine several theoretical aspects of this discovery plane in both the gravity-mediation NUHM2 model and the general mirage-mediation (GMM') models. These include: the associated chargino mass m(chi_1^+), the expected regions of the bottom-up notion of electroweak naturalness Δ_{EW}, and the expected regions of stringy naturalness. While compatibility with electroweak naturalness allows for mass gaps Δm^0~ 4-20 GeV, stringy naturalness exhibits a clear preference for yet smaller mass gaps of 4-10 GeV. For still smaller mass gaps, the plane becomes sharply unnatural since very large gaugino masses are required. This study informs the most promising SUSY search channels and parameter space regions for the upcoming HL-LHC runs and possible HE-LHC option.
16 pages + 3 two-part figures; version 2 updated to coincide with journal copy
References in corpus (15)
- Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
- Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
- SUSY models under siege: LHC constraints and electroweak fine-tuning
- Monojet plus soft dilepton signal from light higgsino pair production at LHC14
- Nearly Degenerate Gauginos and Dark Matter at the LHC
- Supersymmetry, Naturalness, and Light Higgsinos
- TeV Scale Mirage Mediation and Natural Little SUSY Hierarchy
- Accessing the core of naturalness, nearly degenerate higgsinos, at the LHC
- Supersymmetric Higgs and Radiative Electroweak breaking
- Revisiting the SUSY mu problem and its solutions in the LHC era
- Natural generalized mirage mediation
- A landscape solution to the SUSY flavor and CP problems
- Supergravity gauge theories strike back: There is no crisis for SUSY but a new collider may be required for discovery
- LHC SUSY and WIMP dark matter searches confront the string theory landscape
- The fine-tuning problems of particle physics and anthropic mechanisms