Abstract
Supersymmetry (SUSY) is an attractive extension of the Standard Model (SM) of particle physics which solves the SM hierarchy problem. Motivated by the theoretical $\mu$-term problem of the Minimal Supersymmetric Model (MSSM), the Next-to MSSM (NMSSM) can also account for experimental deviations from the SM like the anomalous muon magnetic moment and the dark matter relic density. Natural SUSY, motivated by naturalness considerations, exhibits small fine tuning and a characteristic phenomenology with light higgsinos, stops and gluinos. We describe a scan in NMSSM parameter space motivated by Natural SUSY and guided by the phenomenology of an NMSSM with a slightly broken Peccei-Quinn symmetry and a lightly coupled singlet. We identify a scenario which survives experimental constraints with a light singlet Higgs and a singlino lightest SUSY particle. We then discuss how the scenario is not presently excluded by searches at the Large Hadron Collider (LHC) and which channels are promising for discovery at the LHC and International Linear Collider.
Highlights
With the discovery of the 125 GeV Higgs boson h125 by ATLAS [1] and CMS [2] at the Large Hadron Collider (LHC), particle physics enters a new era
We further identify the h125 as the second lightest neutral scalar h2 of the Next-to MSSM (NMSSM) and note that the h125 signal strength measurements at the LHC [5,6] place the heavier NMSSM a2, h3, H + in the effective Minimal Supersymmetric Model (MSSM) decoupling limit
We have reviewed the motivation for a natural NMSSM with a slightly broken PQ symmetry and a lightly coupled singlet featuring a light singlet pseudoscalar a1, a light singlet scalar h1, and a light singlino LightestSupersymmetric Partner (LSP) χ1 Dark Matter (DM) candidate annihilating via χ1χ1 → bb
Summary
With the discovery of the 125 GeV Higgs boson h125 by ATLAS [1] and CMS [2] at the Large Hadron Collider (LHC), particle physics enters a new era. In the Standard Model (SM) of particle physics, the properties of the Higgs boson are determined by theory once the mass is known [3]. At present, their measurements are consistent with the SM prediction [4,5,6,7,8,9]. The characteristic mass spectrum of Natural SUSY includes light superpartners of the Higgs bosons, top quark and gluon near the electroweak scale. An effective μ-term is generated as the vacuum expectation value of S, μeff = λ S , reaching a natural scale without fine tuning [13,14].
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