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It is a distinct possibility that a Hidden Valley sector would have aspectrum of light particles consisting of both stable and unstable dark mesons.The simultaneous presence of these two types of particles can lead to novelmechanisms for generating the correct dark matter relic abundance, which inturn can reflect themselves into new exotic signatures at colliders. We studythe viability of such sectors for various Hidden Valley models and map thevalid parameter space to possible collider signatures. Mediators studiedinclude various scalar bifundamentals and a heavy $Z'$. It is shown that ingeneral bounds from direct and indirect detection can easily be avoided. Inmost of the allowed parameter space, the relic density is determined by stablemesons annihilating to unstable ones which in turn decay quickly to StandardModel particles. Dark mesons that decay mainly to heavier Standard Modelfermions allow for more valid parameter space, though dark mesons are stillallowed to decay exclusively to some of the lighter fermions. Possible exoticcollider signatures include displaced vertices, emerging jets and semivisiblejets.

Dark matter in Hidden Valley models with stable and unstable light dark mesons