The Scale of Dark QCD

TL;DR

This paper proposes a mechanism linking dark QCD confinement scale to ordinary QCD, explaining the similar mass scales of dark matter and baryons, and predicts TeV-scale particles for detection.

Contribution

It introduces a dynamical model relating dark QCD and ordinary QCD scales via infrared fixed points, explaining dark matter mass similarity.

Findings

Dark QCD particles likely have masses at 1-2 TeV.

The model predicts observable collider signatures involving visible and dark jets.

The mechanism naturally explains the comparable energy densities of dark matter and ordinary matter.

Abstract

Most of the mass of ordinary matter has its origin from quantum chromodynamics (QCD). A similar strong dynamics, dark QCD, could exist to explain the mass origin of dark matter. Using infrared fixed points of the two gauge couplings, we provide a dynamical mechanism that relates the dark QCD confinement scale to our QCD scale, and hence provides an explanation for comparable dark baryon and proton masses. Together with a mechanism that generates equal amounts of dark baryon and ordinary baryon asymmetries in the early universe, the similarity of dark matter and ordinary matter energy densities can be naturally explained. For a large class of gauge group representations, the particles charged under both QCD and dark QCD, necessary ingredients for generating the infrared fixed points, are found to have masses at one to two TeV, which sets the scale for dark matter direct detection and novel collider signatures involving visible and dark jets.