Baryogenesis and dark matter in the mirror twin Higgs

bstract We consider a natural asymmetric dark matter (ADM) model in the mirror twin Higgs (MTH). We show that it is possible to obtain the correct dark matter (DM) abundance when a twin baryon is the DM without the need of explicit breaking of the MTH ℤ 2 symmetry in the dimensionless couplings (i.e. without hard ℤ 2 breaking). We illustrate how this is possible in a specific baryogenesis setup, which also leads to ADM. In the simplest scenario we obtain m DM ~ O (1) GeV, just above the proton mass. We show estimates for direct detection rates at present and future experiments.