Twin Baryogenesis

TL;DR

This paper proposes a mechanism within Twin Higgs models that explains dark matter and matter-antimatter asymmetry through particle decays, predicting a 5 GeV twin baryon as dark matter with detectable collider signatures.

Contribution

It introduces a novel baryogenesis mechanism in Twin Higgs models involving TeV-scale particle decays and explores associated collider phenomenology.

Findings

Dark matter is a 5 GeV twin baryon.

Dark matter can decay to three quarks, producing indirect detection signals.

The model predicts new colored particles accessible at the LHC.

Abstract

In the context of Twin Higgs models, we study a simple mechanism that simultaneously generates asymmetries in the dark and visible sector through the out-of-equilibrium decay of a TeV scale particle charged under a combination of baryon and twin baryon number. We predict the dark matter to be a 5 GeV twin baryon, which is easy to achieve because of the similarity between the two confinement scales. Dark matter is metastable and can decay to three quarks, yielding indirect detection signatures. The mechanism requires the introduction of a new colored particle, typically within the reach of the LHC, of which we study the rich collider phenomenology, including prompt and displaced dijets, multi-jets, monojets and monotops.