Simplified models of dark matter with a long-lived co-annihilation partner

Simplified models of dark matter with a long-lived co-annihilation partner

Blog Article

Abstract We introduce a new set of simplified models to address the effects of 3-point interactions between the dark matter particle, its dark co-annihilation partner, and the Standard Model degree of freedom, which we take to be the tau lepton.The contributions from dark matter co-annihilation channels are highly relevant for a determination of the correct cubs foam finger relic abundance.We investigate these effects as well as the discovery potential for dark matter co-annihilation partners at the LHC.

A small mass splitting between the dark matter and its partner is preferred by the co-annihilation mechanism and suggests that the co-annihilation partners may be long-lived (stable or meta-stable) at collider scales.It is argued that such long-lived electrically charged particles can be looked for at the LHC in searches of anomalous charged tracks.This approach and the underlying models provide an alternative/complementarity to the mono-jet and multi-jet based dark matter searches widely camo iphone se case used in the context of simplified models with s-channel mediators.

We consider four types of simplified models with different particle spins and coupling structures.Some of these models are manifestly gauge invariant and renormalizable, others would ultimately require a UV completion.These can be realised in terms of supersymmetric models in the neutralino-stau co-annihilation regime, as well as models with extra dimensions or composite models.