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Main Author:	Chung, Yi
Format:	Preprint
Published:	2025
Subjects:	High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies
Online Access:	https://arxiv.org/abs/2506.10928
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author	Chung, Yi
author_facet	Chung, Yi
contents	The similarity between the dark matter and baryon energy densities suggests an existence of a dark sector analogous to QCD. In addition, small-scale structure anomalies can be addressed by dark matter self-interactions with cross sections comparable to those of QCD. Both observations point toward a GeV-scale dark QCD sector. Motivated by these two coincidences, we investigate the parameter space of a distinctive chiral dark QCD model featuring a MeV-scale dark photon with axial-vector couplings. We also discuss a possible third coincidence associated with the latest measurement of $N_{\rm eff}$. Current constraints leave a finite and testable region of parameter space that can be probed by future experiments such as the Gamma Factory.
format	Preprint
id	arxiv_https___arxiv_org_abs_2506_10928
institution	arXiv
publishDate	2025
record_format	arxiv
spellingShingle	Two coincidences are a clue: Probing a GeV-scale dark QCD sector Chung, Yi High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies The similarity between the dark matter and baryon energy densities suggests an existence of a dark sector analogous to QCD. In addition, small-scale structure anomalies can be addressed by dark matter self-interactions with cross sections comparable to those of QCD. Both observations point toward a GeV-scale dark QCD sector. Motivated by these two coincidences, we investigate the parameter space of a distinctive chiral dark QCD model featuring a MeV-scale dark photon with axial-vector couplings. We also discuss a possible third coincidence associated with the latest measurement of $N_{\rm eff}$. Current constraints leave a finite and testable region of parameter space that can be probed by future experiments such as the Gamma Factory.
title	Two coincidences are a clue: Probing a GeV-scale dark QCD sector
topic	High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies
url	https://arxiv.org/abs/2506.10928

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