Higgs exotic decays in general NMSSM with self-interacting dark matter

TL;DR

This paper explores how the general NMSSM model allows for self-interacting dark matter and predicts Higgs exotic decays with measurable branching ratios, linking cosmological small structure to collider phenomenology.

Contribution

It demonstrates the parameter space where self-interacting dark matter coexists with observable Higgs exotic decays in the NMSSM framework.

Findings

Higgs exotic decay branching ratios can reach a few percent.

Parameter space consistent with small structure cosmology is identified.

Future colliders could detect these exotic Higgs decays.

Abstract

Under current LHC and dark matter constraints, the general NMSSM can have self-interacting dark matter to explain the cosmological small structure. In this scenario, the dark matter is the light singlino-like neutralino ($\chi$) which self-interacts through exchanging the light singlet-like scalars ($h_1, a_1$). These light scalars and neutralinos inevitably interact with the 125 GeV SM-like Higgs boson ($h_{SM}$), which cause the Higgs exotic decays $h_{SM} \to h_1 h_1, a_1 a_1, \chi\chi$. We first demonstrate the parameter space required by the explanation of the cosmological small structure and then display the Higgs exotic decays. We find that in such a parameter space the Higgs exotic decays can have branching ratios of a few percent, which should be accessible in the future $e^+e^-$ colliders.