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A preponderance of astrophysical and cosmological evidence indicates that theuniverse contains not only visible matter but also dark matter. In order tosuppress the couplings between the dark and visible sectors, a standardassumption is that these two sectors communicate only through a mediator. Inthis paper we make a simple but important observation: if the dark sectorcontains multiple components with similar quantum numbers, then this mediatoralso generically gives rise to dark-sector decays, with heavier dark componentsdecaying to lighter components. This in turn can even give rise to relativelylong dark decay chains, with each step of the decay chain also producingvisible matter. The visible byproducts of such mediator-induced decay chainscan therefore serve as a unique signature of such scenarios. In order toexamine this possibility more concretely, we examine a scenario in which amulti-component dark sector is connected through a mediator to Standard-Modelquarks. We then demonstrate that such a scenario gives rise to multi-jetcollider signatures, and we examine the properties of such jets at both theparton and detector levels. Within relatively large regions of parameter space,we find that such multi-jet signatures are not excluded by existing monojet andmulti-jet searches. Such decay cascades therefore represent a potentialdiscovery route for multi-component dark sectors at current and futurecolliders.

Non-Minimal Dark Sectors: Mediator-Induced Decay Chains and Multi-Jet Collider Signatures