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 [Formula: see text] which self-interacts through exchanging the light singlet-like scalars [Formula: see text]. These light scalars and neutralinos inevitably interact with the 125 GeV SM-like Higgs boson [Formula: see text], which cause the Higgs exotic decays [Formula: see text], [Formula: see text], [Formula: see text]. 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 [Formula: see text] colliders.

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