Baryogenesis and Dark Matter in the Mirror Twin Higgs

TL;DR

This paper proposes a natural asymmetric dark matter model within the mirror twin Higgs framework, achieving correct dark matter abundance without explicit symmetry breaking, and explores its detection prospects.

Contribution

It introduces a novel ADM model in the MTH context that does not require explicit Z2 symmetry breaking, linking baryogenesis to dark matter production.

Findings

Achieves correct dark matter abundance with twin baryons

Predicts dark matter mass around 1 GeV

Provides estimates for direct detection experiments

Abstract

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 $\mathbb{Z}_2$ symmetry in the dimensionless couplings (i.e. without hard $\mathbb{Z}_2$ breaking). We illustrate how this is possible in a specific baryogenesis setup, which also leads to ADM. In the simplest scenario we obtain $m_{\rm DM}\sim O(1)$GeV, just above the proton mass. We show estimates for direct detection rates at present and future experiments.