Abstract
A comologically stable neutral component from a nearly pure $SU(2)$ doublet, with a mass $\sim$1.1 TeV, is one appealing candidate for dark matter (DM) consistent with all direct dark matter searches. We have explored this possibility in the context of the Minimal Supersymmetric extension of the Standard Model (MSSM), with the Higgsino playing the role of DM, in theories where supersymmetry breaking is transmitted by gravitational interactions at the unification scale $M\simeq 2\times 10^{16}$ GeV. We have focussed our work in the search of "light" supersymmetric spectra, which could be at reach of present and/or future colliders, in models with universal and non-universal Higgs and gaugino Majorana masses. The lightest supersymmetric particles of the spectrum are, by construction, two neutralinos and one chargino, almost degenerate, with a mass $\sim $1.1 TeV, and a mass splitting of a few GeV. Depending on the particular scenario the gluino can be at its experimental mass lower bound $\sim$ 2.2 TeV; in the squark sector, the lightest stop can be as light as $\sim$ 1.3 TeV, and the lightest slepton, the right-handed stau, can have a mass as light as $1.2$ TeV. The lightest neutralino can be found at the next generation of direct dark matter experimental searches. In the most favorable situation, the gluino, with some specific decay channels, could be found at the next run of the Large Hadron Collider (LHC), and the lightest stop at the High-Luminosity LHC run.
Highlights
Supersymmetry, and in particular the minimal supersymmetric extension of the Standard Model (MSSM), remains the most appealing solution to the Standard Model’s naturalness problem [1,2]
A cosmologically stable neutral component from a nearly pure SUð2Þ doublet, with a mass ∼1.1 TeV, is one appealing candidate for dark matter (DM) consistent with all direct dark matter searches. We explore this possibility in the context of the minimal supersymmetric extension of the Standard Model, with the Higgsino playing the role of DM, in theories where supersymmetry breaking is transmitted by gravitational interactions at the unification scale M ≃ 2 × 1016 GeV
As the MSSM spectrum largely depends on the supersymmetry-breaking mechanism and the solution to the supersymmetric μ problem, we work with models of gravity mediation of supersymmetry breaking, where the μ term can be generated through a nonrenormalizable contribution to the Kähler potential, i.e., the Giudice-Masiero mechanism [20]
Summary
Supersymmetry, and in particular the minimal supersymmetric extension of the Standard Model (MSSM), remains the most appealing solution to the Standard Model’s naturalness problem [1,2]. As the MSSM spectrum largely depends on the supersymmetry-breaking mechanism and the solution to the supersymmetric μ problem (generation of the μ term in the Higgs superpotential), we work with models of gravity mediation of supersymmetry breaking, where the μ term can be generated through a nonrenormalizable contribution to the Kähler potential, i.e., the Giudice-Masiero mechanism [20] For these models the scale M at which supersymmetry is broken (i.e., the scale at which the soft-breaking masses are generated) is identified with the scale where gauge couplings unify, i.e., the unification scale M ≃ 2 × 1016 GeV [2].
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