Reach of threshold-corrected dark QCD

Abstract

We consider a recently-proposed model which posits the existence of composite dark matter, wherein dark "quarks" transforming as fundamentals under an SU (3) d gauge group undergo a confining phase and form dark baryons. The model attempts to explain both the O(1) relic density ratio, Ω dark /Ω baryon ∼ 5.4, as well as the asymmetric production of both dark and baryonic matter via leptogenesis. Though the solution of β functions for SU (3)c and SU (3) d constitutes the main drive of the model, no threshold corrections were taken into account as the renormalization scale crosses the mass threshold of the heavy new fields in the model. We extend this work by explicitly calculating the threshold-corrected renormalization-group flow for the theory using an effective-field matching technique. We find that the theory has a much wider range of applicability than previously thought, and that a significant fraction of models (defined by the number of fields contained therein) is able to account for the observed relic density.

Bridging the μHz gap in the gravitational-wave landscape: unveiling dark baryons

“…[26] and further explored in refs. [47,48]. As a consequence, the confinement scales of visible and dark QCD become related through this dynamical mechanism, resulting in m VM ∼ m DM .…”

Implementing Asymmetric Dark Matter and Dark Electroweak Baryogenesis in a Mirror Two-Higgs-Doublet Model

“…The most obvious idea is that DM is a baryon-like bound state of an interaction in the dark sector that resembles QCD. Several such schemes have been proposed and analysed in the literature, though only a few of them have the DMproton mass connection as a motivation [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23]. Indeed, with an arbitrary confining gauge force in the dark sector and a general particle content, there is no reason for the confinement scale to be near that of visible QCD.…”

“…Indeed, with an arbitrary confining gauge force in the dark sector and a general particle content, there is no reason for the confinement scale to be near that of visible QCD. Two exceptions to this have been proposed: (i) the dark gauge group mirrors QCD by being SU (3), and the two confinement scales are related through either an exact or somewhat broken symmetry that connects the two SU(3) sectors, and (ii) the particle content is chosen so that the two running coupling constants approach infrared fixed points whose magnitudes are similar [22,23]. Both ideas have merit, and in this paper we consider option (i).…”