Two coincidences are a clue: Probing a GeV-scale dark QCD sector
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866915895827234816 |
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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 |