Invisible Higgs Decays to Hooperons in the NMSSM

TL;DR

This paper explores how the NMSSM can explain the galactic center gamma-ray excess through light Majorana fermions and pseudoscalar mediators, predicting significant invisible Higgs decays detectable at the LHC.

Contribution

It demonstrates a connection between the galactic center excess and large invisible Higgs decay rates in the NMSSM with singlino-like neutralinos, accessible at current collider experiments.

Findings

Predicted invisible Higgs branching ratios exceed 50%.

Constraints from GUT-scale boundary conditions have minimal impact.

Results complement previous studies linking the excess to heavy Higgs searches.

Abstract

The galactic center excess of gamma ray photons can be naturally explained by light Majorana fermions in combination with a pseudoscalar mediator. The NMSSM provides exactly these ingredients. We show that for neutralinos with a significant singlino component the galactic center excess can be linked to invisible decays of the Standard-Model-like Higgs at the LHC. We find predictions for invisible Higgs branching ratios in excess of 50 percent, easily accessible at the LHC. Constraining the NMSSM through GUT-scale boundary conditions only slightly affects this expectation. Our results complement earlier NMSSM studies of the galactic center excess, which link it to heavy Higgs searches at the LHC.