Asymmetric accidental composite dark matter

TL;DR

This paper presents a minimal UV-complete model for asymmetric composite dark matter, where dark baryons are bound states of a confining gauge group, with mechanisms for asymmetry generation and symmetric component annihilation.

Contribution

It introduces a simple UV completion for ACDM models that naturally generates dark matter asymmetry and ensures stability, compatible with GUT frameworks.

Findings

Successfully generates the correct dark matter asymmetry for masses up to 75 TeV.

Provides a mechanism for annihilating the symmetric component via residual interactions.

Maintains dark matter stability even with GUT completions.

Abstract

The goal of this work is to find the simplest UV completion of Accidental Composite Dark Matter Models (ACDM) that can dynamically generate an asymmetry for the DM candidate, the lightest \textit{dark baryon} (DCb), and simultaneously annihilate the symmetric component. In this framework the DCb is a bound state of a confining $\text{SU}(N)_{\text{DC}}$ gauge group, and can interact weakly with the visible sector. The constituents of the DCb can possess non-trivial charges under the Standard Model gauge group. The generation of asymmetry for such candidate is a two-flavor variation of the \emph{out-of-equilibrium} decay of a heavy scalar, with mass $M_\phi\gtrsim 10^{10}$ GeV. Below the scale of the scalars, the models recover accidental stability, or long-livedness, of the DM candidate. The symmetric component is annihilated by residual confined interactions provided that the mass of the DCb $m_{\text{DCb}} \lesssim 75$ TeV. We implement the mechanism of asymmetry generation, or a variation of it, in all the original ACDM models, managing to generate the correct asymmetry for DCb of masses in this range. For some of the models found, the stability of the DM candidate is not spoiled even considering generic GUT completions or asymmetry generation mechanisms in the visible sector.