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The neutralino sector of the semi-constrained next-to-minimal supersymmetricstandard model is explored under recent experimental constraints, with specialattention to dark matter (DM) limits. The effects of the upper and lower boundsof dark matter relic density and recent direct detection constraints onspin-independent and -dependent cross-sections are thoroughly analyzed.Particularly, we show which regions of the parameter space are ruled out due tothe different dark matter constraints and the corresponding model-specificparameters: $\lambda, \kappa, A_{\lambda}$, and $A_{\kappa}$. We analyze allannihilation and co-annihilation processes (with heavier neutralinos andcharginos) that contribute to the dark matter relic density. The masscomponents of the dark matter candidate, the lightest neutralino$\tilde{\chi}_1^0$, are studied, and the decays of heavy neutralinos andcharginos, especially $\tilde{\chi}_2^0$ and $\tilde{\chi}_1^+$, into thelightest neutralino are examined. We impose semi-universal boundary conditionsat the Grand Unified Theory scale and require a moderate range of $\tan{\beta}\lesssim 10$. We find that the allowed parameter space is associated with aheavy mass spectrum in general and that the lightest neutralino is mostlyHiggsino with a mass range that resides mostly between 1000 and 1500 GeV.However, smaller mass values can be achieved if the DM candidate is bino-likeor singlino-like.

Dark matter constraints and the neutralino sector of the scNMSSM