Peccei-Quinn NMSSM in the light of 125 GeV Higgs

TL;DR

This paper explores the phenomenology of a Peccei-Quinn invariant NMSSM model in light of the 125 GeV Higgs, focusing on dark matter constraints, collider signals, and potential relaxations via saxion-induced entropy production.

Contribution

It provides a detailed analysis of the Peccei-Quinn NMSSM's phenomenology, including dark matter and collider implications, with considerations of saxion effects on constraints.

Findings

Light singlino-like LSP constrained by Higgs invisible decay

Saxion-induced entropy production can relax dark matter constraints

Collider signals include multi-jet and missing energy signatures

Abstract

We study the phenomenology of the Peccei-Quinn invariant extension of the next-to-minimal supersymmetric standard model (NMSSM) in view of the recent discovery of a 125 GeV Higgs boson. The minimal model having no quadratic and cubic terms of the NMSSM singlet field predicts a light singlino-like lightest supersymmetric particle (LSP). The model is strongly constrained by the Higgs invisible decay and the dark matter characteristic of the LSP, while some constraints can be relaxed by assuming that the saxion, the CP-even companion of the axion in the Peccei-Quinn sector, causes a late-time entropy production diluting the thermal LSP density. The collider signal of the model contains multi-jet and $h/W/Z$ plus missing energy, which can be discovered in the early stage of the 14 TeV LHC running.