We explore how indirect constraints on dark matter annihilation limit the parameter space for suchmore » cascade/multi-particle decays. While remaining agnostic to the details of the hidden sector model, our framework captures the generic broadening of the spectrum of secondary particles (photons, neutrinos, e +e - andmore » $$\\overline and p-barp) relative to the case of direct annihilation to Standard Model particles. We map out the potential signals and current constraints on such a framework in indirect searches, using a model-independent setup based on multi-step hierarchical cascade decays. If dark matter inhabits an expanded `` hidden sector'', annihilations may proceed through sequential decays or multi-body final states. Model-independent indirect detection constraints on hidden sector dark matterĮlor, Gilly Rodd, Nicholas L.
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