Natural NMSSM with a Light Singlet Higgs and Singlino LSP

TL;DR

This paper explores a natural NMSSM scenario featuring a light singlet Higgs and singlino LSP, which remains viable under current experimental constraints and offers promising channels for future collider discovery.

Contribution

It identifies a natural NMSSM parameter space with a light singlet Higgs and singlino LSP that is consistent with existing constraints and discusses potential collider signatures.

Findings

Scenario survives current LHC constraints

Light singlet Higgs and singlino LSP are viable

Promising channels for future collider searches

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.