Asymmetric Accidental Composite Dark Matter

TL;DR

This paper explores minimal UV-complete models for asymmetric composite dark matter, where dark baryons are stable bound states of a confining gauge group, generated asymmetrically via heavy scalar decays, and annihilate symmetric components through residual interactions.

Contribution

It introduces the simplest UV completions for asymmetric composite dark matter models that generate asymmetry and ensure annihilation of symmetric components.

Findings

Dark matter is a stable bound state of a confining SU(N) gauge group.

Asymmetry is generated via out-of-equilibrium decay of heavy scalars.

Symmetric component is annihilated if dark baryon mass is below 75 TeV.

Abstract

The goal of this work is to find the simplest UV completions of Accidental Composite Dark Matter models that can dynamically generate an asymmetry for the Dark Matter candidate, the lightest dark baryon, and simultaneously annihilate the symmetric component. In this framework Dark Matter is an accidentally stable bound state of a confining $\mathrm{SU}(N)$ gauge group that can interact weakly with the visible sector. The generation of asymmetry for such candidate happens via the out-of-equilibrium decay of two flavors of a heavy scalar $\phi$, with mass $M_\phi > 10^{10}$ GeV. Below such scale, the models recover accidental stability, or long-livedness, of the Dark Matter candidate. The symmetric component is annihilated by residual confined interactions provided that the mass of the dark baryon is < 75 TeV.