Abstract
We propose a model which explains the baryon asymmetry of the universe and dark matter relic density at the same time. In this model, dark matter candidate is the dark baryon composed by dark quarks. A scalar mediator, which couples to the standard model leptons and dark quarks, is introduced to generate the asymmetry of baryon and dark baryon simultaneously. Direct detection and collider detection of this model are studied. We find that current underground direct detection experiments and LHC can hardly detect this model. But future lepton colliders, such as CEPC, have great potential to detect a large portion of the model parameter space by "displaced lepton jet" signal.
Highlights
The observed baryon asymmetry of the universe (BAU) is a main puzzle in modern cosmology and particle physics
Definite observation evidence of Weakly interacting massive particle (WIMP) has not been seen in above searches
In this paper we focus on the composite asymmetric dark matter (ADM) model [38,39,42,43,46,47,48,49]
Summary
The observed baryon asymmetry of the universe (BAU) is a main puzzle in modern cosmology and particle physics. The asymmetry in both visible and dark sector comes from the asymmetry of mediator Φ, and the particle number densities in two sectors are automatically connected to each other. Different with the model proposed in [45], the dark sector in this model mainly talks to the lepton sector in the SM Such a leptophilic composite ADM model can be detected by direct detection (DD) experiments through the scattering with electrons.
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